1 //===-- PPCISelLowering.cpp - PPC DAG Lowering Implementation -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the PPCISelLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "PPCISelLowering.h"
15 #include "PPCMachineFunctionInfo.h"
16 #include "PPCPerfectShuffle.h"
17 #include "PPCTargetMachine.h"
18 #include "MCTargetDesc/PPCPredicates.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/VectorExtras.h"
21 #include "llvm/CodeGen/CallingConvLower.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/MachineInstrBuilder.h"
25 #include "llvm/CodeGen/MachineRegisterInfo.h"
26 #include "llvm/CodeGen/PseudoSourceValue.h"
27 #include "llvm/CodeGen/SelectionDAG.h"
28 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
29 #include "llvm/CallingConv.h"
30 #include "llvm/Constants.h"
31 #include "llvm/Function.h"
32 #include "llvm/Intrinsics.h"
33 #include "llvm/Support/MathExtras.h"
34 #include "llvm/Target/TargetOptions.h"
35 #include "llvm/Support/CommandLine.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/Support/raw_ostream.h"
38 #include "llvm/DerivedTypes.h"
41 static bool CC_PPC_SVR4_Custom_Dummy(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
42 CCValAssign::LocInfo &LocInfo,
43 ISD::ArgFlagsTy &ArgFlags,
45 static bool CC_PPC_SVR4_Custom_AlignArgRegs(unsigned &ValNo, MVT &ValVT,
47 CCValAssign::LocInfo &LocInfo,
48 ISD::ArgFlagsTy &ArgFlags,
50 static bool CC_PPC_SVR4_Custom_AlignFPArgRegs(unsigned &ValNo, MVT &ValVT,
52 CCValAssign::LocInfo &LocInfo,
53 ISD::ArgFlagsTy &ArgFlags,
56 static cl::opt<bool> EnablePPCPreinc("enable-ppc-preinc",
57 cl::desc("enable preincrement load/store generation on PPC (experimental)"),
60 static TargetLoweringObjectFile *CreateTLOF(const PPCTargetMachine &TM) {
61 if (TM.getSubtargetImpl()->isDarwin())
62 return new TargetLoweringObjectFileMachO();
64 return new TargetLoweringObjectFileELF();
67 PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
68 : TargetLowering(TM, CreateTLOF(TM)), PPCSubTarget(*TM.getSubtargetImpl()) {
72 // Use _setjmp/_longjmp instead of setjmp/longjmp.
73 setUseUnderscoreSetJmp(true);
74 setUseUnderscoreLongJmp(true);
76 // On PPC32/64, arguments smaller than 4/8 bytes are extended, so all
77 // arguments are at least 4/8 bytes aligned.
78 setMinStackArgumentAlignment(TM.getSubtarget<PPCSubtarget>().isPPC64() ? 8:4);
80 // Set up the register classes.
81 addRegisterClass(MVT::i32, PPC::GPRCRegisterClass);
82 addRegisterClass(MVT::f32, PPC::F4RCRegisterClass);
83 addRegisterClass(MVT::f64, PPC::F8RCRegisterClass);
85 // PowerPC has an i16 but no i8 (or i1) SEXTLOAD
86 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
87 setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
89 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
91 // PowerPC has pre-inc load and store's.
92 setIndexedLoadAction(ISD::PRE_INC, MVT::i1, Legal);
93 setIndexedLoadAction(ISD::PRE_INC, MVT::i8, Legal);
94 setIndexedLoadAction(ISD::PRE_INC, MVT::i16, Legal);
95 setIndexedLoadAction(ISD::PRE_INC, MVT::i32, Legal);
96 setIndexedLoadAction(ISD::PRE_INC, MVT::i64, Legal);
97 setIndexedStoreAction(ISD::PRE_INC, MVT::i1, Legal);
98 setIndexedStoreAction(ISD::PRE_INC, MVT::i8, Legal);
99 setIndexedStoreAction(ISD::PRE_INC, MVT::i16, Legal);
100 setIndexedStoreAction(ISD::PRE_INC, MVT::i32, Legal);
101 setIndexedStoreAction(ISD::PRE_INC, MVT::i64, Legal);
103 // This is used in the ppcf128->int sequence. Note it has different semantics
104 // from FP_ROUND: that rounds to nearest, this rounds to zero.
105 setOperationAction(ISD::FP_ROUND_INREG, MVT::ppcf128, Custom);
107 // PowerPC has no SREM/UREM instructions
108 setOperationAction(ISD::SREM, MVT::i32, Expand);
109 setOperationAction(ISD::UREM, MVT::i32, Expand);
110 setOperationAction(ISD::SREM, MVT::i64, Expand);
111 setOperationAction(ISD::UREM, MVT::i64, Expand);
113 // Don't use SMUL_LOHI/UMUL_LOHI or SDIVREM/UDIVREM to lower SREM/UREM.
114 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
115 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
116 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
117 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
118 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
119 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
120 setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
121 setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
123 // We don't support sin/cos/sqrt/fmod/pow
124 setOperationAction(ISD::FSIN , MVT::f64, Expand);
125 setOperationAction(ISD::FCOS , MVT::f64, Expand);
126 setOperationAction(ISD::FREM , MVT::f64, Expand);
127 setOperationAction(ISD::FPOW , MVT::f64, Expand);
128 setOperationAction(ISD::FMA , MVT::f64, Expand);
129 setOperationAction(ISD::FSIN , MVT::f32, Expand);
130 setOperationAction(ISD::FCOS , MVT::f32, Expand);
131 setOperationAction(ISD::FREM , MVT::f32, Expand);
132 setOperationAction(ISD::FPOW , MVT::f32, Expand);
133 setOperationAction(ISD::FMA , MVT::f32, Expand);
135 setOperationAction(ISD::FLT_ROUNDS_, MVT::i32, Custom);
137 // If we're enabling GP optimizations, use hardware square root
138 if (!TM.getSubtarget<PPCSubtarget>().hasFSQRT()) {
139 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
140 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
143 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
144 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
146 // PowerPC does not have BSWAP, CTPOP or CTTZ
147 setOperationAction(ISD::BSWAP, MVT::i32 , Expand);
148 setOperationAction(ISD::CTPOP, MVT::i32 , Expand);
149 setOperationAction(ISD::CTTZ , MVT::i32 , Expand);
150 setOperationAction(ISD::BSWAP, MVT::i64 , Expand);
151 setOperationAction(ISD::CTPOP, MVT::i64 , Expand);
152 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
154 // PowerPC does not have ROTR
155 setOperationAction(ISD::ROTR, MVT::i32 , Expand);
156 setOperationAction(ISD::ROTR, MVT::i64 , Expand);
158 // PowerPC does not have Select
159 setOperationAction(ISD::SELECT, MVT::i32, Expand);
160 setOperationAction(ISD::SELECT, MVT::i64, Expand);
161 setOperationAction(ISD::SELECT, MVT::f32, Expand);
162 setOperationAction(ISD::SELECT, MVT::f64, Expand);
164 // PowerPC wants to turn select_cc of FP into fsel when possible.
165 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
166 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
168 // PowerPC wants to optimize integer setcc a bit
169 setOperationAction(ISD::SETCC, MVT::i32, Custom);
171 // PowerPC does not have BRCOND which requires SetCC
172 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
174 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
176 // PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
177 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
179 // PowerPC does not have [U|S]INT_TO_FP
180 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
181 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
183 setOperationAction(ISD::BITCAST, MVT::f32, Expand);
184 setOperationAction(ISD::BITCAST, MVT::i32, Expand);
185 setOperationAction(ISD::BITCAST, MVT::i64, Expand);
186 setOperationAction(ISD::BITCAST, MVT::f64, Expand);
188 // We cannot sextinreg(i1). Expand to shifts.
189 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
191 setOperationAction(ISD::EXCEPTIONADDR, MVT::i64, Expand);
192 setOperationAction(ISD::EHSELECTION, MVT::i64, Expand);
193 setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
194 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
197 // We want to legalize GlobalAddress and ConstantPool nodes into the
198 // appropriate instructions to materialize the address.
199 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
200 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
201 setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
202 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
203 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
204 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
205 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
206 setOperationAction(ISD::BlockAddress, MVT::i64, Custom);
207 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
208 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
211 setOperationAction(ISD::TRAP, MVT::Other, Legal);
213 // TRAMPOLINE is custom lowered.
214 setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
215 setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
217 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
218 setOperationAction(ISD::VASTART , MVT::Other, Custom);
220 // VAARG is custom lowered with the 32-bit SVR4 ABI.
221 if (TM.getSubtarget<PPCSubtarget>().isSVR4ABI()
222 && !TM.getSubtarget<PPCSubtarget>().isPPC64()) {
223 setOperationAction(ISD::VAARG, MVT::Other, Custom);
224 setOperationAction(ISD::VAARG, MVT::i64, Custom);
226 setOperationAction(ISD::VAARG, MVT::Other, Expand);
228 // Use the default implementation.
229 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
230 setOperationAction(ISD::VAEND , MVT::Other, Expand);
231 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
232 setOperationAction(ISD::STACKRESTORE , MVT::Other, Custom);
233 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
234 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64 , Custom);
236 // We want to custom lower some of our intrinsics.
237 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
239 // Comparisons that require checking two conditions.
240 setCondCodeAction(ISD::SETULT, MVT::f32, Expand);
241 setCondCodeAction(ISD::SETULT, MVT::f64, Expand);
242 setCondCodeAction(ISD::SETUGT, MVT::f32, Expand);
243 setCondCodeAction(ISD::SETUGT, MVT::f64, Expand);
244 setCondCodeAction(ISD::SETUEQ, MVT::f32, Expand);
245 setCondCodeAction(ISD::SETUEQ, MVT::f64, Expand);
246 setCondCodeAction(ISD::SETOGE, MVT::f32, Expand);
247 setCondCodeAction(ISD::SETOGE, MVT::f64, Expand);
248 setCondCodeAction(ISD::SETOLE, MVT::f32, Expand);
249 setCondCodeAction(ISD::SETOLE, MVT::f64, Expand);
250 setCondCodeAction(ISD::SETONE, MVT::f32, Expand);
251 setCondCodeAction(ISD::SETONE, MVT::f64, Expand);
253 if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
254 // They also have instructions for converting between i64 and fp.
255 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
256 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
257 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
258 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
259 // This is just the low 32 bits of a (signed) fp->i64 conversion.
260 // We cannot do this with Promote because i64 is not a legal type.
261 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
263 // FIXME: disable this lowered code. This generates 64-bit register values,
264 // and we don't model the fact that the top part is clobbered by calls. We
265 // need to flag these together so that the value isn't live across a call.
266 //setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
268 // PowerPC does not have FP_TO_UINT on 32-bit implementations.
269 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
272 if (TM.getSubtarget<PPCSubtarget>().use64BitRegs()) {
273 // 64-bit PowerPC implementations can support i64 types directly
274 addRegisterClass(MVT::i64, PPC::G8RCRegisterClass);
275 // BUILD_PAIR can't be handled natively, and should be expanded to shl/or
276 setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
277 // 64-bit PowerPC wants to expand i128 shifts itself.
278 setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
279 setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
280 setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
282 // 32-bit PowerPC wants to expand i64 shifts itself.
283 setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
284 setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
285 setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
288 if (TM.getSubtarget<PPCSubtarget>().hasAltivec()) {
289 // First set operation action for all vector types to expand. Then we
290 // will selectively turn on ones that can be effectively codegen'd.
291 for (unsigned i = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
292 i <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++i) {
293 MVT::SimpleValueType VT = (MVT::SimpleValueType)i;
295 // add/sub are legal for all supported vector VT's.
296 setOperationAction(ISD::ADD , VT, Legal);
297 setOperationAction(ISD::SUB , VT, Legal);
299 // We promote all shuffles to v16i8.
300 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Promote);
301 AddPromotedToType (ISD::VECTOR_SHUFFLE, VT, MVT::v16i8);
303 // We promote all non-typed operations to v4i32.
304 setOperationAction(ISD::AND , VT, Promote);
305 AddPromotedToType (ISD::AND , VT, MVT::v4i32);
306 setOperationAction(ISD::OR , VT, Promote);
307 AddPromotedToType (ISD::OR , VT, MVT::v4i32);
308 setOperationAction(ISD::XOR , VT, Promote);
309 AddPromotedToType (ISD::XOR , VT, MVT::v4i32);
310 setOperationAction(ISD::LOAD , VT, Promote);
311 AddPromotedToType (ISD::LOAD , VT, MVT::v4i32);
312 setOperationAction(ISD::SELECT, VT, Promote);
313 AddPromotedToType (ISD::SELECT, VT, MVT::v4i32);
314 setOperationAction(ISD::STORE, VT, Promote);
315 AddPromotedToType (ISD::STORE, VT, MVT::v4i32);
317 // No other operations are legal.
318 setOperationAction(ISD::MUL , VT, Expand);
319 setOperationAction(ISD::SDIV, VT, Expand);
320 setOperationAction(ISD::SREM, VT, Expand);
321 setOperationAction(ISD::UDIV, VT, Expand);
322 setOperationAction(ISD::UREM, VT, Expand);
323 setOperationAction(ISD::FDIV, VT, Expand);
324 setOperationAction(ISD::FNEG, VT, Expand);
325 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Expand);
326 setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Expand);
327 setOperationAction(ISD::BUILD_VECTOR, VT, Expand);
328 setOperationAction(ISD::UMUL_LOHI, VT, Expand);
329 setOperationAction(ISD::SMUL_LOHI, VT, Expand);
330 setOperationAction(ISD::UDIVREM, VT, Expand);
331 setOperationAction(ISD::SDIVREM, VT, Expand);
332 setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Expand);
333 setOperationAction(ISD::FPOW, VT, Expand);
334 setOperationAction(ISD::CTPOP, VT, Expand);
335 setOperationAction(ISD::CTLZ, VT, Expand);
336 setOperationAction(ISD::CTTZ, VT, Expand);
339 // We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
340 // with merges, splats, etc.
341 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
343 setOperationAction(ISD::AND , MVT::v4i32, Legal);
344 setOperationAction(ISD::OR , MVT::v4i32, Legal);
345 setOperationAction(ISD::XOR , MVT::v4i32, Legal);
346 setOperationAction(ISD::LOAD , MVT::v4i32, Legal);
347 setOperationAction(ISD::SELECT, MVT::v4i32, Expand);
348 setOperationAction(ISD::STORE , MVT::v4i32, Legal);
350 addRegisterClass(MVT::v4f32, PPC::VRRCRegisterClass);
351 addRegisterClass(MVT::v4i32, PPC::VRRCRegisterClass);
352 addRegisterClass(MVT::v8i16, PPC::VRRCRegisterClass);
353 addRegisterClass(MVT::v16i8, PPC::VRRCRegisterClass);
355 setOperationAction(ISD::MUL, MVT::v4f32, Legal);
356 setOperationAction(ISD::MUL, MVT::v4i32, Custom);
357 setOperationAction(ISD::MUL, MVT::v8i16, Custom);
358 setOperationAction(ISD::MUL, MVT::v16i8, Custom);
360 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Custom);
361 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Custom);
363 setOperationAction(ISD::BUILD_VECTOR, MVT::v16i8, Custom);
364 setOperationAction(ISD::BUILD_VECTOR, MVT::v8i16, Custom);
365 setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32, Custom);
366 setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
369 setOperationAction(ISD::ATOMIC_LOAD, MVT::i32, Expand);
370 setOperationAction(ISD::ATOMIC_STORE, MVT::i32, Expand);
372 setBooleanContents(ZeroOrOneBooleanContent);
373 setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
375 if (TM.getSubtarget<PPCSubtarget>().isPPC64()) {
376 setStackPointerRegisterToSaveRestore(PPC::X1);
377 setExceptionPointerRegister(PPC::X3);
378 setExceptionSelectorRegister(PPC::X4);
380 setStackPointerRegisterToSaveRestore(PPC::R1);
381 setExceptionPointerRegister(PPC::R3);
382 setExceptionSelectorRegister(PPC::R4);
385 // We have target-specific dag combine patterns for the following nodes:
386 setTargetDAGCombine(ISD::SINT_TO_FP);
387 setTargetDAGCombine(ISD::STORE);
388 setTargetDAGCombine(ISD::BR_CC);
389 setTargetDAGCombine(ISD::BSWAP);
391 // Darwin long double math library functions have $LDBL128 appended.
392 if (TM.getSubtarget<PPCSubtarget>().isDarwin()) {
393 setLibcallName(RTLIB::COS_PPCF128, "cosl$LDBL128");
394 setLibcallName(RTLIB::POW_PPCF128, "powl$LDBL128");
395 setLibcallName(RTLIB::REM_PPCF128, "fmodl$LDBL128");
396 setLibcallName(RTLIB::SIN_PPCF128, "sinl$LDBL128");
397 setLibcallName(RTLIB::SQRT_PPCF128, "sqrtl$LDBL128");
398 setLibcallName(RTLIB::LOG_PPCF128, "logl$LDBL128");
399 setLibcallName(RTLIB::LOG2_PPCF128, "log2l$LDBL128");
400 setLibcallName(RTLIB::LOG10_PPCF128, "log10l$LDBL128");
401 setLibcallName(RTLIB::EXP_PPCF128, "expl$LDBL128");
402 setLibcallName(RTLIB::EXP2_PPCF128, "exp2l$LDBL128");
405 setMinFunctionAlignment(2);
406 if (PPCSubTarget.isDarwin())
407 setPrefFunctionAlignment(4);
409 setInsertFencesForAtomic(true);
411 computeRegisterProperties();
414 /// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
415 /// function arguments in the caller parameter area.
416 unsigned PPCTargetLowering::getByValTypeAlignment(Type *Ty) const {
417 const TargetMachine &TM = getTargetMachine();
418 // Darwin passes everything on 4 byte boundary.
419 if (TM.getSubtarget<PPCSubtarget>().isDarwin())
425 const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
428 case PPCISD::FSEL: return "PPCISD::FSEL";
429 case PPCISD::FCFID: return "PPCISD::FCFID";
430 case PPCISD::FCTIDZ: return "PPCISD::FCTIDZ";
431 case PPCISD::FCTIWZ: return "PPCISD::FCTIWZ";
432 case PPCISD::STFIWX: return "PPCISD::STFIWX";
433 case PPCISD::VMADDFP: return "PPCISD::VMADDFP";
434 case PPCISD::VNMSUBFP: return "PPCISD::VNMSUBFP";
435 case PPCISD::VPERM: return "PPCISD::VPERM";
436 case PPCISD::Hi: return "PPCISD::Hi";
437 case PPCISD::Lo: return "PPCISD::Lo";
438 case PPCISD::TOC_ENTRY: return "PPCISD::TOC_ENTRY";
439 case PPCISD::TOC_RESTORE: return "PPCISD::TOC_RESTORE";
440 case PPCISD::LOAD: return "PPCISD::LOAD";
441 case PPCISD::LOAD_TOC: return "PPCISD::LOAD_TOC";
442 case PPCISD::DYNALLOC: return "PPCISD::DYNALLOC";
443 case PPCISD::GlobalBaseReg: return "PPCISD::GlobalBaseReg";
444 case PPCISD::SRL: return "PPCISD::SRL";
445 case PPCISD::SRA: return "PPCISD::SRA";
446 case PPCISD::SHL: return "PPCISD::SHL";
447 case PPCISD::EXTSW_32: return "PPCISD::EXTSW_32";
448 case PPCISD::STD_32: return "PPCISD::STD_32";
449 case PPCISD::CALL_SVR4: return "PPCISD::CALL_SVR4";
450 case PPCISD::CALL_Darwin: return "PPCISD::CALL_Darwin";
451 case PPCISD::NOP: return "PPCISD::NOP";
452 case PPCISD::MTCTR: return "PPCISD::MTCTR";
453 case PPCISD::BCTRL_Darwin: return "PPCISD::BCTRL_Darwin";
454 case PPCISD::BCTRL_SVR4: return "PPCISD::BCTRL_SVR4";
455 case PPCISD::RET_FLAG: return "PPCISD::RET_FLAG";
456 case PPCISD::MFCR: return "PPCISD::MFCR";
457 case PPCISD::VCMP: return "PPCISD::VCMP";
458 case PPCISD::VCMPo: return "PPCISD::VCMPo";
459 case PPCISD::LBRX: return "PPCISD::LBRX";
460 case PPCISD::STBRX: return "PPCISD::STBRX";
461 case PPCISD::LARX: return "PPCISD::LARX";
462 case PPCISD::STCX: return "PPCISD::STCX";
463 case PPCISD::COND_BRANCH: return "PPCISD::COND_BRANCH";
464 case PPCISD::MFFS: return "PPCISD::MFFS";
465 case PPCISD::MTFSB0: return "PPCISD::MTFSB0";
466 case PPCISD::MTFSB1: return "PPCISD::MTFSB1";
467 case PPCISD::FADDRTZ: return "PPCISD::FADDRTZ";
468 case PPCISD::MTFSF: return "PPCISD::MTFSF";
469 case PPCISD::TC_RETURN: return "PPCISD::TC_RETURN";
473 EVT PPCTargetLowering::getSetCCResultType(EVT VT) const {
477 //===----------------------------------------------------------------------===//
478 // Node matching predicates, for use by the tblgen matching code.
479 //===----------------------------------------------------------------------===//
481 /// isFloatingPointZero - Return true if this is 0.0 or -0.0.
482 static bool isFloatingPointZero(SDValue Op) {
483 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
484 return CFP->getValueAPF().isZero();
485 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
486 // Maybe this has already been legalized into the constant pool?
487 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
488 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
489 return CFP->getValueAPF().isZero();
494 /// isConstantOrUndef - Op is either an undef node or a ConstantSDNode. Return
495 /// true if Op is undef or if it matches the specified value.
496 static bool isConstantOrUndef(int Op, int Val) {
497 return Op < 0 || Op == Val;
500 /// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
501 /// VPKUHUM instruction.
502 bool PPC::isVPKUHUMShuffleMask(ShuffleVectorSDNode *N, bool isUnary) {
504 for (unsigned i = 0; i != 16; ++i)
505 if (!isConstantOrUndef(N->getMaskElt(i), i*2+1))
508 for (unsigned i = 0; i != 8; ++i)
509 if (!isConstantOrUndef(N->getMaskElt(i), i*2+1) ||
510 !isConstantOrUndef(N->getMaskElt(i+8), i*2+1))
516 /// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
517 /// VPKUWUM instruction.
518 bool PPC::isVPKUWUMShuffleMask(ShuffleVectorSDNode *N, bool isUnary) {
520 for (unsigned i = 0; i != 16; i += 2)
521 if (!isConstantOrUndef(N->getMaskElt(i ), i*2+2) ||
522 !isConstantOrUndef(N->getMaskElt(i+1), i*2+3))
525 for (unsigned i = 0; i != 8; i += 2)
526 if (!isConstantOrUndef(N->getMaskElt(i ), i*2+2) ||
527 !isConstantOrUndef(N->getMaskElt(i+1), i*2+3) ||
528 !isConstantOrUndef(N->getMaskElt(i+8), i*2+2) ||
529 !isConstantOrUndef(N->getMaskElt(i+9), i*2+3))
535 /// isVMerge - Common function, used to match vmrg* shuffles.
537 static bool isVMerge(ShuffleVectorSDNode *N, unsigned UnitSize,
538 unsigned LHSStart, unsigned RHSStart) {
539 assert(N->getValueType(0) == MVT::v16i8 &&
540 "PPC only supports shuffles by bytes!");
541 assert((UnitSize == 1 || UnitSize == 2 || UnitSize == 4) &&
542 "Unsupported merge size!");
544 for (unsigned i = 0; i != 8/UnitSize; ++i) // Step over units
545 for (unsigned j = 0; j != UnitSize; ++j) { // Step over bytes within unit
546 if (!isConstantOrUndef(N->getMaskElt(i*UnitSize*2+j),
547 LHSStart+j+i*UnitSize) ||
548 !isConstantOrUndef(N->getMaskElt(i*UnitSize*2+UnitSize+j),
549 RHSStart+j+i*UnitSize))
555 /// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
556 /// a VRGL* instruction with the specified unit size (1,2 or 4 bytes).
557 bool PPC::isVMRGLShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
560 return isVMerge(N, UnitSize, 8, 24);
561 return isVMerge(N, UnitSize, 8, 8);
564 /// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
565 /// a VRGH* instruction with the specified unit size (1,2 or 4 bytes).
566 bool PPC::isVMRGHShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
569 return isVMerge(N, UnitSize, 0, 16);
570 return isVMerge(N, UnitSize, 0, 0);
574 /// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift
575 /// amount, otherwise return -1.
576 int PPC::isVSLDOIShuffleMask(SDNode *N, bool isUnary) {
577 assert(N->getValueType(0) == MVT::v16i8 &&
578 "PPC only supports shuffles by bytes!");
580 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
582 // Find the first non-undef value in the shuffle mask.
584 for (i = 0; i != 16 && SVOp->getMaskElt(i) < 0; ++i)
587 if (i == 16) return -1; // all undef.
589 // Otherwise, check to see if the rest of the elements are consecutively
590 // numbered from this value.
591 unsigned ShiftAmt = SVOp->getMaskElt(i);
592 if (ShiftAmt < i) return -1;
596 // Check the rest of the elements to see if they are consecutive.
597 for (++i; i != 16; ++i)
598 if (!isConstantOrUndef(SVOp->getMaskElt(i), ShiftAmt+i))
601 // Check the rest of the elements to see if they are consecutive.
602 for (++i; i != 16; ++i)
603 if (!isConstantOrUndef(SVOp->getMaskElt(i), (ShiftAmt+i) & 15))
609 /// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
610 /// specifies a splat of a single element that is suitable for input to
611 /// VSPLTB/VSPLTH/VSPLTW.
612 bool PPC::isSplatShuffleMask(ShuffleVectorSDNode *N, unsigned EltSize) {
613 assert(N->getValueType(0) == MVT::v16i8 &&
614 (EltSize == 1 || EltSize == 2 || EltSize == 4));
616 // This is a splat operation if each element of the permute is the same, and
617 // if the value doesn't reference the second vector.
618 unsigned ElementBase = N->getMaskElt(0);
620 // FIXME: Handle UNDEF elements too!
621 if (ElementBase >= 16)
624 // Check that the indices are consecutive, in the case of a multi-byte element
625 // splatted with a v16i8 mask.
626 for (unsigned i = 1; i != EltSize; ++i)
627 if (N->getMaskElt(i) < 0 || N->getMaskElt(i) != (int)(i+ElementBase))
630 for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
631 if (N->getMaskElt(i) < 0) continue;
632 for (unsigned j = 0; j != EltSize; ++j)
633 if (N->getMaskElt(i+j) != N->getMaskElt(j))
639 /// isAllNegativeZeroVector - Returns true if all elements of build_vector
641 bool PPC::isAllNegativeZeroVector(SDNode *N) {
642 BuildVectorSDNode *BV = cast<BuildVectorSDNode>(N);
644 APInt APVal, APUndef;
648 if (BV->isConstantSplat(APVal, APUndef, BitSize, HasAnyUndefs, 32, true))
649 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
650 return CFP->getValueAPF().isNegZero();
655 /// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
656 /// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
657 unsigned PPC::getVSPLTImmediate(SDNode *N, unsigned EltSize) {
658 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
659 assert(isSplatShuffleMask(SVOp, EltSize));
660 return SVOp->getMaskElt(0) / EltSize;
663 /// get_VSPLTI_elt - If this is a build_vector of constants which can be formed
664 /// by using a vspltis[bhw] instruction of the specified element size, return
665 /// the constant being splatted. The ByteSize field indicates the number of
666 /// bytes of each element [124] -> [bhw].
667 SDValue PPC::get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
670 // If ByteSize of the splat is bigger than the element size of the
671 // build_vector, then we have a case where we are checking for a splat where
672 // multiple elements of the buildvector are folded together into a single
673 // logical element of the splat (e.g. "vsplish 1" to splat {0,1}*8).
674 unsigned EltSize = 16/N->getNumOperands();
675 if (EltSize < ByteSize) {
676 unsigned Multiple = ByteSize/EltSize; // Number of BV entries per spltval.
677 SDValue UniquedVals[4];
678 assert(Multiple > 1 && Multiple <= 4 && "How can this happen?");
680 // See if all of the elements in the buildvector agree across.
681 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
682 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
683 // If the element isn't a constant, bail fully out.
684 if (!isa<ConstantSDNode>(N->getOperand(i))) return SDValue();
687 if (UniquedVals[i&(Multiple-1)].getNode() == 0)
688 UniquedVals[i&(Multiple-1)] = N->getOperand(i);
689 else if (UniquedVals[i&(Multiple-1)] != N->getOperand(i))
690 return SDValue(); // no match.
693 // Okay, if we reached this point, UniquedVals[0..Multiple-1] contains
694 // either constant or undef values that are identical for each chunk. See
695 // if these chunks can form into a larger vspltis*.
697 // Check to see if all of the leading entries are either 0 or -1. If
698 // neither, then this won't fit into the immediate field.
699 bool LeadingZero = true;
700 bool LeadingOnes = true;
701 for (unsigned i = 0; i != Multiple-1; ++i) {
702 if (UniquedVals[i].getNode() == 0) continue; // Must have been undefs.
704 LeadingZero &= cast<ConstantSDNode>(UniquedVals[i])->isNullValue();
705 LeadingOnes &= cast<ConstantSDNode>(UniquedVals[i])->isAllOnesValue();
707 // Finally, check the least significant entry.
709 if (UniquedVals[Multiple-1].getNode() == 0)
710 return DAG.getTargetConstant(0, MVT::i32); // 0,0,0,undef
711 int Val = cast<ConstantSDNode>(UniquedVals[Multiple-1])->getZExtValue();
713 return DAG.getTargetConstant(Val, MVT::i32); // 0,0,0,4 -> vspltisw(4)
716 if (UniquedVals[Multiple-1].getNode() == 0)
717 return DAG.getTargetConstant(~0U, MVT::i32); // -1,-1,-1,undef
718 int Val =cast<ConstantSDNode>(UniquedVals[Multiple-1])->getSExtValue();
719 if (Val >= -16) // -1,-1,-1,-2 -> vspltisw(-2)
720 return DAG.getTargetConstant(Val, MVT::i32);
726 // Check to see if this buildvec has a single non-undef value in its elements.
727 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
728 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
729 if (OpVal.getNode() == 0)
730 OpVal = N->getOperand(i);
731 else if (OpVal != N->getOperand(i))
735 if (OpVal.getNode() == 0) return SDValue(); // All UNDEF: use implicit def.
737 unsigned ValSizeInBytes = EltSize;
739 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
740 Value = CN->getZExtValue();
741 } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
742 assert(CN->getValueType(0) == MVT::f32 && "Only one legal FP vector type!");
743 Value = FloatToBits(CN->getValueAPF().convertToFloat());
746 // If the splat value is larger than the element value, then we can never do
747 // this splat. The only case that we could fit the replicated bits into our
748 // immediate field for would be zero, and we prefer to use vxor for it.
749 if (ValSizeInBytes < ByteSize) return SDValue();
751 // If the element value is larger than the splat value, cut it in half and
752 // check to see if the two halves are equal. Continue doing this until we
753 // get to ByteSize. This allows us to handle 0x01010101 as 0x01.
754 while (ValSizeInBytes > ByteSize) {
755 ValSizeInBytes >>= 1;
757 // If the top half equals the bottom half, we're still ok.
758 if (((Value >> (ValSizeInBytes*8)) & ((1 << (8*ValSizeInBytes))-1)) !=
759 (Value & ((1 << (8*ValSizeInBytes))-1)))
763 // Properly sign extend the value.
764 int ShAmt = (4-ByteSize)*8;
765 int MaskVal = ((int)Value << ShAmt) >> ShAmt;
767 // If this is zero, don't match, zero matches ISD::isBuildVectorAllZeros.
768 if (MaskVal == 0) return SDValue();
770 // Finally, if this value fits in a 5 bit sext field, return it
771 if (((MaskVal << (32-5)) >> (32-5)) == MaskVal)
772 return DAG.getTargetConstant(MaskVal, MVT::i32);
776 //===----------------------------------------------------------------------===//
777 // Addressing Mode Selection
778 //===----------------------------------------------------------------------===//
780 /// isIntS16Immediate - This method tests to see if the node is either a 32-bit
781 /// or 64-bit immediate, and if the value can be accurately represented as a
782 /// sign extension from a 16-bit value. If so, this returns true and the
784 static bool isIntS16Immediate(SDNode *N, short &Imm) {
785 if (N->getOpcode() != ISD::Constant)
788 Imm = (short)cast<ConstantSDNode>(N)->getZExtValue();
789 if (N->getValueType(0) == MVT::i32)
790 return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
792 return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
794 static bool isIntS16Immediate(SDValue Op, short &Imm) {
795 return isIntS16Immediate(Op.getNode(), Imm);
799 /// SelectAddressRegReg - Given the specified addressed, check to see if it
800 /// can be represented as an indexed [r+r] operation. Returns false if it
801 /// can be more efficiently represented with [r+imm].
802 bool PPCTargetLowering::SelectAddressRegReg(SDValue N, SDValue &Base,
804 SelectionDAG &DAG) const {
806 if (N.getOpcode() == ISD::ADD) {
807 if (isIntS16Immediate(N.getOperand(1), imm))
809 if (N.getOperand(1).getOpcode() == PPCISD::Lo)
812 Base = N.getOperand(0);
813 Index = N.getOperand(1);
815 } else if (N.getOpcode() == ISD::OR) {
816 if (isIntS16Immediate(N.getOperand(1), imm))
817 return false; // r+i can fold it if we can.
819 // If this is an or of disjoint bitfields, we can codegen this as an add
820 // (for better address arithmetic) if the LHS and RHS of the OR are provably
822 APInt LHSKnownZero, LHSKnownOne;
823 APInt RHSKnownZero, RHSKnownOne;
824 DAG.ComputeMaskedBits(N.getOperand(0),
825 APInt::getAllOnesValue(N.getOperand(0)
826 .getValueSizeInBits()),
827 LHSKnownZero, LHSKnownOne);
829 if (LHSKnownZero.getBoolValue()) {
830 DAG.ComputeMaskedBits(N.getOperand(1),
831 APInt::getAllOnesValue(N.getOperand(1)
832 .getValueSizeInBits()),
833 RHSKnownZero, RHSKnownOne);
834 // If all of the bits are known zero on the LHS or RHS, the add won't
836 if (~(LHSKnownZero | RHSKnownZero) == 0) {
837 Base = N.getOperand(0);
838 Index = N.getOperand(1);
847 /// Returns true if the address N can be represented by a base register plus
848 /// a signed 16-bit displacement [r+imm], and if it is not better
849 /// represented as reg+reg.
850 bool PPCTargetLowering::SelectAddressRegImm(SDValue N, SDValue &Disp,
852 SelectionDAG &DAG) const {
853 // FIXME dl should come from parent load or store, not from address
854 DebugLoc dl = N.getDebugLoc();
855 // If this can be more profitably realized as r+r, fail.
856 if (SelectAddressRegReg(N, Disp, Base, DAG))
859 if (N.getOpcode() == ISD::ADD) {
861 if (isIntS16Immediate(N.getOperand(1), imm)) {
862 Disp = DAG.getTargetConstant((int)imm & 0xFFFF, MVT::i32);
863 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
864 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
866 Base = N.getOperand(0);
868 return true; // [r+i]
869 } else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
870 // Match LOAD (ADD (X, Lo(G))).
871 assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getZExtValue()
872 && "Cannot handle constant offsets yet!");
873 Disp = N.getOperand(1).getOperand(0); // The global address.
874 assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
875 Disp.getOpcode() == ISD::TargetConstantPool ||
876 Disp.getOpcode() == ISD::TargetJumpTable);
877 Base = N.getOperand(0);
878 return true; // [&g+r]
880 } else if (N.getOpcode() == ISD::OR) {
882 if (isIntS16Immediate(N.getOperand(1), imm)) {
883 // If this is an or of disjoint bitfields, we can codegen this as an add
884 // (for better address arithmetic) if the LHS and RHS of the OR are
885 // provably disjoint.
886 APInt LHSKnownZero, LHSKnownOne;
887 DAG.ComputeMaskedBits(N.getOperand(0),
888 APInt::getAllOnesValue(N.getOperand(0)
889 .getValueSizeInBits()),
890 LHSKnownZero, LHSKnownOne);
892 if ((LHSKnownZero.getZExtValue()|~(uint64_t)imm) == ~0ULL) {
893 // If all of the bits are known zero on the LHS or RHS, the add won't
895 Base = N.getOperand(0);
896 Disp = DAG.getTargetConstant((int)imm & 0xFFFF, MVT::i32);
900 } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
901 // Loading from a constant address.
903 // If this address fits entirely in a 16-bit sext immediate field, codegen
906 if (isIntS16Immediate(CN, Imm)) {
907 Disp = DAG.getTargetConstant(Imm, CN->getValueType(0));
908 Base = DAG.getRegister(PPCSubTarget.isPPC64() ? PPC::X0 : PPC::R0,
909 CN->getValueType(0));
913 // Handle 32-bit sext immediates with LIS + addr mode.
914 if (CN->getValueType(0) == MVT::i32 ||
915 (int64_t)CN->getZExtValue() == (int)CN->getZExtValue()) {
916 int Addr = (int)CN->getZExtValue();
918 // Otherwise, break this down into an LIS + disp.
919 Disp = DAG.getTargetConstant((short)Addr, MVT::i32);
921 Base = DAG.getTargetConstant((Addr - (signed short)Addr) >> 16, MVT::i32);
922 unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
923 Base = SDValue(DAG.getMachineNode(Opc, dl, CN->getValueType(0), Base), 0);
928 Disp = DAG.getTargetConstant(0, getPointerTy());
929 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
930 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
933 return true; // [r+0]
936 /// SelectAddressRegRegOnly - Given the specified addressed, force it to be
937 /// represented as an indexed [r+r] operation.
938 bool PPCTargetLowering::SelectAddressRegRegOnly(SDValue N, SDValue &Base,
940 SelectionDAG &DAG) const {
941 // Check to see if we can easily represent this as an [r+r] address. This
942 // will fail if it thinks that the address is more profitably represented as
943 // reg+imm, e.g. where imm = 0.
944 if (SelectAddressRegReg(N, Base, Index, DAG))
947 // If the operand is an addition, always emit this as [r+r], since this is
948 // better (for code size, and execution, as the memop does the add for free)
949 // than emitting an explicit add.
950 if (N.getOpcode() == ISD::ADD) {
951 Base = N.getOperand(0);
952 Index = N.getOperand(1);
956 // Otherwise, do it the hard way, using R0 as the base register.
957 Base = DAG.getRegister(PPCSubTarget.isPPC64() ? PPC::X0 : PPC::R0,
963 /// SelectAddressRegImmShift - Returns true if the address N can be
964 /// represented by a base register plus a signed 14-bit displacement
965 /// [r+imm*4]. Suitable for use by STD and friends.
966 bool PPCTargetLowering::SelectAddressRegImmShift(SDValue N, SDValue &Disp,
968 SelectionDAG &DAG) const {
969 // FIXME dl should come from the parent load or store, not the address
970 DebugLoc dl = N.getDebugLoc();
971 // If this can be more profitably realized as r+r, fail.
972 if (SelectAddressRegReg(N, Disp, Base, DAG))
975 if (N.getOpcode() == ISD::ADD) {
977 if (isIntS16Immediate(N.getOperand(1), imm) && (imm & 3) == 0) {
978 Disp = DAG.getTargetConstant(((int)imm & 0xFFFF) >> 2, MVT::i32);
979 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
980 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
982 Base = N.getOperand(0);
984 return true; // [r+i]
985 } else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
986 // Match LOAD (ADD (X, Lo(G))).
987 assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getZExtValue()
988 && "Cannot handle constant offsets yet!");
989 Disp = N.getOperand(1).getOperand(0); // The global address.
990 assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
991 Disp.getOpcode() == ISD::TargetConstantPool ||
992 Disp.getOpcode() == ISD::TargetJumpTable);
993 Base = N.getOperand(0);
994 return true; // [&g+r]
996 } else if (N.getOpcode() == ISD::OR) {
998 if (isIntS16Immediate(N.getOperand(1), imm) && (imm & 3) == 0) {
999 // If this is an or of disjoint bitfields, we can codegen this as an add
1000 // (for better address arithmetic) if the LHS and RHS of the OR are
1001 // provably disjoint.
1002 APInt LHSKnownZero, LHSKnownOne;
1003 DAG.ComputeMaskedBits(N.getOperand(0),
1004 APInt::getAllOnesValue(N.getOperand(0)
1005 .getValueSizeInBits()),
1006 LHSKnownZero, LHSKnownOne);
1007 if ((LHSKnownZero.getZExtValue()|~(uint64_t)imm) == ~0ULL) {
1008 // If all of the bits are known zero on the LHS or RHS, the add won't
1010 Base = N.getOperand(0);
1011 Disp = DAG.getTargetConstant(((int)imm & 0xFFFF) >> 2, MVT::i32);
1015 } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
1016 // Loading from a constant address. Verify low two bits are clear.
1017 if ((CN->getZExtValue() & 3) == 0) {
1018 // If this address fits entirely in a 14-bit sext immediate field, codegen
1021 if (isIntS16Immediate(CN, Imm)) {
1022 Disp = DAG.getTargetConstant((unsigned short)Imm >> 2, getPointerTy());
1023 Base = DAG.getRegister(PPCSubTarget.isPPC64() ? PPC::X0 : PPC::R0,
1024 CN->getValueType(0));
1028 // Fold the low-part of 32-bit absolute addresses into addr mode.
1029 if (CN->getValueType(0) == MVT::i32 ||
1030 (int64_t)CN->getZExtValue() == (int)CN->getZExtValue()) {
1031 int Addr = (int)CN->getZExtValue();
1033 // Otherwise, break this down into an LIS + disp.
1034 Disp = DAG.getTargetConstant((short)Addr >> 2, MVT::i32);
1035 Base = DAG.getTargetConstant((Addr-(signed short)Addr) >> 16, MVT::i32);
1036 unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
1037 Base = SDValue(DAG.getMachineNode(Opc, dl, CN->getValueType(0), Base),0);
1043 Disp = DAG.getTargetConstant(0, getPointerTy());
1044 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
1045 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
1048 return true; // [r+0]
1052 /// getPreIndexedAddressParts - returns true by value, base pointer and
1053 /// offset pointer and addressing mode by reference if the node's address
1054 /// can be legally represented as pre-indexed load / store address.
1055 bool PPCTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
1057 ISD::MemIndexedMode &AM,
1058 SelectionDAG &DAG) const {
1059 // Disabled by default for now.
1060 if (!EnablePPCPreinc) return false;
1064 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1065 Ptr = LD->getBasePtr();
1066 VT = LD->getMemoryVT();
1068 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1069 Ptr = ST->getBasePtr();
1070 VT = ST->getMemoryVT();
1074 // PowerPC doesn't have preinc load/store instructions for vectors.
1078 // TODO: Check reg+reg first.
1080 // LDU/STU use reg+imm*4, others use reg+imm.
1081 if (VT != MVT::i64) {
1083 if (!SelectAddressRegImm(Ptr, Offset, Base, DAG))
1087 if (!SelectAddressRegImmShift(Ptr, Offset, Base, DAG))
1091 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1092 // PPC64 doesn't have lwau, but it does have lwaux. Reject preinc load of
1093 // sext i32 to i64 when addr mode is r+i.
1094 if (LD->getValueType(0) == MVT::i64 && LD->getMemoryVT() == MVT::i32 &&
1095 LD->getExtensionType() == ISD::SEXTLOAD &&
1096 isa<ConstantSDNode>(Offset))
1104 //===----------------------------------------------------------------------===//
1105 // LowerOperation implementation
1106 //===----------------------------------------------------------------------===//
1108 /// GetLabelAccessInfo - Return true if we should reference labels using a
1109 /// PICBase, set the HiOpFlags and LoOpFlags to the target MO flags.
1110 static bool GetLabelAccessInfo(const TargetMachine &TM, unsigned &HiOpFlags,
1111 unsigned &LoOpFlags, const GlobalValue *GV = 0) {
1112 HiOpFlags = PPCII::MO_HA16;
1113 LoOpFlags = PPCII::MO_LO16;
1115 // Don't use the pic base if not in PIC relocation model. Or if we are on a
1116 // non-darwin platform. We don't support PIC on other platforms yet.
1117 bool isPIC = TM.getRelocationModel() == Reloc::PIC_ &&
1118 TM.getSubtarget<PPCSubtarget>().isDarwin();
1120 HiOpFlags |= PPCII::MO_PIC_FLAG;
1121 LoOpFlags |= PPCII::MO_PIC_FLAG;
1124 // If this is a reference to a global value that requires a non-lazy-ptr, make
1125 // sure that instruction lowering adds it.
1126 if (GV && TM.getSubtarget<PPCSubtarget>().hasLazyResolverStub(GV, TM)) {
1127 HiOpFlags |= PPCII::MO_NLP_FLAG;
1128 LoOpFlags |= PPCII::MO_NLP_FLAG;
1130 if (GV->hasHiddenVisibility()) {
1131 HiOpFlags |= PPCII::MO_NLP_HIDDEN_FLAG;
1132 LoOpFlags |= PPCII::MO_NLP_HIDDEN_FLAG;
1139 static SDValue LowerLabelRef(SDValue HiPart, SDValue LoPart, bool isPIC,
1140 SelectionDAG &DAG) {
1141 EVT PtrVT = HiPart.getValueType();
1142 SDValue Zero = DAG.getConstant(0, PtrVT);
1143 DebugLoc DL = HiPart.getDebugLoc();
1145 SDValue Hi = DAG.getNode(PPCISD::Hi, DL, PtrVT, HiPart, Zero);
1146 SDValue Lo = DAG.getNode(PPCISD::Lo, DL, PtrVT, LoPart, Zero);
1148 // With PIC, the first instruction is actually "GR+hi(&G)".
1150 Hi = DAG.getNode(ISD::ADD, DL, PtrVT,
1151 DAG.getNode(PPCISD::GlobalBaseReg, DL, PtrVT), Hi);
1153 // Generate non-pic code that has direct accesses to the constant pool.
1154 // The address of the global is just (hi(&g)+lo(&g)).
1155 return DAG.getNode(ISD::ADD, DL, PtrVT, Hi, Lo);
1158 SDValue PPCTargetLowering::LowerConstantPool(SDValue Op,
1159 SelectionDAG &DAG) const {
1160 EVT PtrVT = Op.getValueType();
1161 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
1162 const Constant *C = CP->getConstVal();
1164 unsigned MOHiFlag, MOLoFlag;
1165 bool isPIC = GetLabelAccessInfo(DAG.getTarget(), MOHiFlag, MOLoFlag);
1167 DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(), 0, MOHiFlag);
1169 DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(), 0, MOLoFlag);
1170 return LowerLabelRef(CPIHi, CPILo, isPIC, DAG);
1173 SDValue PPCTargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
1174 EVT PtrVT = Op.getValueType();
1175 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
1177 unsigned MOHiFlag, MOLoFlag;
1178 bool isPIC = GetLabelAccessInfo(DAG.getTarget(), MOHiFlag, MOLoFlag);
1179 SDValue JTIHi = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MOHiFlag);
1180 SDValue JTILo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MOLoFlag);
1181 return LowerLabelRef(JTIHi, JTILo, isPIC, DAG);
1184 SDValue PPCTargetLowering::LowerBlockAddress(SDValue Op,
1185 SelectionDAG &DAG) const {
1186 EVT PtrVT = Op.getValueType();
1188 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
1190 unsigned MOHiFlag, MOLoFlag;
1191 bool isPIC = GetLabelAccessInfo(DAG.getTarget(), MOHiFlag, MOLoFlag);
1192 SDValue TgtBAHi = DAG.getBlockAddress(BA, PtrVT, /*isTarget=*/true, MOHiFlag);
1193 SDValue TgtBALo = DAG.getBlockAddress(BA, PtrVT, /*isTarget=*/true, MOLoFlag);
1194 return LowerLabelRef(TgtBAHi, TgtBALo, isPIC, DAG);
1197 SDValue PPCTargetLowering::LowerGlobalAddress(SDValue Op,
1198 SelectionDAG &DAG) const {
1199 EVT PtrVT = Op.getValueType();
1200 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
1201 DebugLoc DL = GSDN->getDebugLoc();
1202 const GlobalValue *GV = GSDN->getGlobal();
1204 // 64-bit SVR4 ABI code is always position-independent.
1205 // The actual address of the GlobalValue is stored in the TOC.
1206 if (PPCSubTarget.isSVR4ABI() && PPCSubTarget.isPPC64()) {
1207 SDValue GA = DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset());
1208 return DAG.getNode(PPCISD::TOC_ENTRY, DL, MVT::i64, GA,
1209 DAG.getRegister(PPC::X2, MVT::i64));
1212 unsigned MOHiFlag, MOLoFlag;
1213 bool isPIC = GetLabelAccessInfo(DAG.getTarget(), MOHiFlag, MOLoFlag, GV);
1216 DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset(), MOHiFlag);
1218 DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset(), MOLoFlag);
1220 SDValue Ptr = LowerLabelRef(GAHi, GALo, isPIC, DAG);
1222 // If the global reference is actually to a non-lazy-pointer, we have to do an
1223 // extra load to get the address of the global.
1224 if (MOHiFlag & PPCII::MO_NLP_FLAG)
1225 Ptr = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), Ptr, MachinePointerInfo(),
1230 SDValue PPCTargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
1231 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
1232 DebugLoc dl = Op.getDebugLoc();
1234 // If we're comparing for equality to zero, expose the fact that this is
1235 // implented as a ctlz/srl pair on ppc, so that the dag combiner can
1236 // fold the new nodes.
1237 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1238 if (C->isNullValue() && CC == ISD::SETEQ) {
1239 EVT VT = Op.getOperand(0).getValueType();
1240 SDValue Zext = Op.getOperand(0);
1241 if (VT.bitsLT(MVT::i32)) {
1243 Zext = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Op.getOperand(0));
1245 unsigned Log2b = Log2_32(VT.getSizeInBits());
1246 SDValue Clz = DAG.getNode(ISD::CTLZ, dl, VT, Zext);
1247 SDValue Scc = DAG.getNode(ISD::SRL, dl, VT, Clz,
1248 DAG.getConstant(Log2b, MVT::i32));
1249 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Scc);
1251 // Leave comparisons against 0 and -1 alone for now, since they're usually
1252 // optimized. FIXME: revisit this when we can custom lower all setcc
1254 if (C->isAllOnesValue() || C->isNullValue())
1258 // If we have an integer seteq/setne, turn it into a compare against zero
1259 // by xor'ing the rhs with the lhs, which is faster than setting a
1260 // condition register, reading it back out, and masking the correct bit. The
1261 // normal approach here uses sub to do this instead of xor. Using xor exposes
1262 // the result to other bit-twiddling opportunities.
1263 EVT LHSVT = Op.getOperand(0).getValueType();
1264 if (LHSVT.isInteger() && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
1265 EVT VT = Op.getValueType();
1266 SDValue Sub = DAG.getNode(ISD::XOR, dl, LHSVT, Op.getOperand(0),
1268 return DAG.getSetCC(dl, VT, Sub, DAG.getConstant(0, LHSVT), CC);
1273 SDValue PPCTargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG,
1274 const PPCSubtarget &Subtarget) const {
1275 SDNode *Node = Op.getNode();
1276 EVT VT = Node->getValueType(0);
1277 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1278 SDValue InChain = Node->getOperand(0);
1279 SDValue VAListPtr = Node->getOperand(1);
1280 const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
1281 DebugLoc dl = Node->getDebugLoc();
1283 assert(!Subtarget.isPPC64() && "LowerVAARG is PPC32 only");
1286 SDValue GprIndex = DAG.getExtLoad(ISD::ZEXTLOAD, dl, MVT::i32, InChain,
1287 VAListPtr, MachinePointerInfo(SV), MVT::i8,
1289 InChain = GprIndex.getValue(1);
1291 if (VT == MVT::i64) {
1292 // Check if GprIndex is even
1293 SDValue GprAnd = DAG.getNode(ISD::AND, dl, MVT::i32, GprIndex,
1294 DAG.getConstant(1, MVT::i32));
1295 SDValue CC64 = DAG.getSetCC(dl, MVT::i32, GprAnd,
1296 DAG.getConstant(0, MVT::i32), ISD::SETNE);
1297 SDValue GprIndexPlusOne = DAG.getNode(ISD::ADD, dl, MVT::i32, GprIndex,
1298 DAG.getConstant(1, MVT::i32));
1299 // Align GprIndex to be even if it isn't
1300 GprIndex = DAG.getNode(ISD::SELECT, dl, MVT::i32, CC64, GprIndexPlusOne,
1304 // fpr index is 1 byte after gpr
1305 SDValue FprPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
1306 DAG.getConstant(1, MVT::i32));
1309 SDValue FprIndex = DAG.getExtLoad(ISD::ZEXTLOAD, dl, MVT::i32, InChain,
1310 FprPtr, MachinePointerInfo(SV), MVT::i8,
1312 InChain = FprIndex.getValue(1);
1314 SDValue RegSaveAreaPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
1315 DAG.getConstant(8, MVT::i32));
1317 SDValue OverflowAreaPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
1318 DAG.getConstant(4, MVT::i32));
1321 SDValue OverflowArea = DAG.getLoad(MVT::i32, dl, InChain, OverflowAreaPtr,
1322 MachinePointerInfo(), false, false, 0);
1323 InChain = OverflowArea.getValue(1);
1325 SDValue RegSaveArea = DAG.getLoad(MVT::i32, dl, InChain, RegSaveAreaPtr,
1326 MachinePointerInfo(), false, false, 0);
1327 InChain = RegSaveArea.getValue(1);
1329 // select overflow_area if index > 8
1330 SDValue CC = DAG.getSetCC(dl, MVT::i32, VT.isInteger() ? GprIndex : FprIndex,
1331 DAG.getConstant(8, MVT::i32), ISD::SETLT);
1333 // adjustment constant gpr_index * 4/8
1334 SDValue RegConstant = DAG.getNode(ISD::MUL, dl, MVT::i32,
1335 VT.isInteger() ? GprIndex : FprIndex,
1336 DAG.getConstant(VT.isInteger() ? 4 : 8,
1339 // OurReg = RegSaveArea + RegConstant
1340 SDValue OurReg = DAG.getNode(ISD::ADD, dl, PtrVT, RegSaveArea,
1343 // Floating types are 32 bytes into RegSaveArea
1344 if (VT.isFloatingPoint())
1345 OurReg = DAG.getNode(ISD::ADD, dl, PtrVT, OurReg,
1346 DAG.getConstant(32, MVT::i32));
1348 // increase {f,g}pr_index by 1 (or 2 if VT is i64)
1349 SDValue IndexPlus1 = DAG.getNode(ISD::ADD, dl, MVT::i32,
1350 VT.isInteger() ? GprIndex : FprIndex,
1351 DAG.getConstant(VT == MVT::i64 ? 2 : 1,
1354 InChain = DAG.getTruncStore(InChain, dl, IndexPlus1,
1355 VT.isInteger() ? VAListPtr : FprPtr,
1356 MachinePointerInfo(SV),
1357 MVT::i8, false, false, 0);
1359 // determine if we should load from reg_save_area or overflow_area
1360 SDValue Result = DAG.getNode(ISD::SELECT, dl, PtrVT, CC, OurReg, OverflowArea);
1362 // increase overflow_area by 4/8 if gpr/fpr > 8
1363 SDValue OverflowAreaPlusN = DAG.getNode(ISD::ADD, dl, PtrVT, OverflowArea,
1364 DAG.getConstant(VT.isInteger() ? 4 : 8,
1367 OverflowArea = DAG.getNode(ISD::SELECT, dl, MVT::i32, CC, OverflowArea,
1370 InChain = DAG.getTruncStore(InChain, dl, OverflowArea,
1372 MachinePointerInfo(),
1373 MVT::i32, false, false, 0);
1375 return DAG.getLoad(VT, dl, InChain, Result, MachinePointerInfo(), false, false, 0);
1378 SDValue PPCTargetLowering::LowerADJUST_TRAMPOLINE(SDValue Op,
1379 SelectionDAG &DAG) const {
1380 return Op.getOperand(0);
1383 SDValue PPCTargetLowering::LowerINIT_TRAMPOLINE(SDValue Op,
1384 SelectionDAG &DAG) const {
1385 SDValue Chain = Op.getOperand(0);
1386 SDValue Trmp = Op.getOperand(1); // trampoline
1387 SDValue FPtr = Op.getOperand(2); // nested function
1388 SDValue Nest = Op.getOperand(3); // 'nest' parameter value
1389 DebugLoc dl = Op.getDebugLoc();
1391 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1392 bool isPPC64 = (PtrVT == MVT::i64);
1394 DAG.getTargetLoweringInfo().getTargetData()->getIntPtrType(
1397 TargetLowering::ArgListTy Args;
1398 TargetLowering::ArgListEntry Entry;
1400 Entry.Ty = IntPtrTy;
1401 Entry.Node = Trmp; Args.push_back(Entry);
1403 // TrampSize == (isPPC64 ? 48 : 40);
1404 Entry.Node = DAG.getConstant(isPPC64 ? 48 : 40,
1405 isPPC64 ? MVT::i64 : MVT::i32);
1406 Args.push_back(Entry);
1408 Entry.Node = FPtr; Args.push_back(Entry);
1409 Entry.Node = Nest; Args.push_back(Entry);
1411 // Lower to a call to __trampoline_setup(Trmp, TrampSize, FPtr, ctx_reg)
1412 std::pair<SDValue, SDValue> CallResult =
1413 LowerCallTo(Chain, Type::getVoidTy(*DAG.getContext()),
1414 false, false, false, false, 0, CallingConv::C, false,
1415 /*isReturnValueUsed=*/true,
1416 DAG.getExternalSymbol("__trampoline_setup", PtrVT),
1419 return CallResult.second;
1422 SDValue PPCTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG,
1423 const PPCSubtarget &Subtarget) const {
1424 MachineFunction &MF = DAG.getMachineFunction();
1425 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
1427 DebugLoc dl = Op.getDebugLoc();
1429 if (Subtarget.isDarwinABI() || Subtarget.isPPC64()) {
1430 // vastart just stores the address of the VarArgsFrameIndex slot into the
1431 // memory location argument.
1432 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1433 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
1434 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1435 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1),
1436 MachinePointerInfo(SV),
1440 // For the 32-bit SVR4 ABI we follow the layout of the va_list struct.
1441 // We suppose the given va_list is already allocated.
1444 // char gpr; /* index into the array of 8 GPRs
1445 // * stored in the register save area
1446 // * gpr=0 corresponds to r3,
1447 // * gpr=1 to r4, etc.
1449 // char fpr; /* index into the array of 8 FPRs
1450 // * stored in the register save area
1451 // * fpr=0 corresponds to f1,
1452 // * fpr=1 to f2, etc.
1454 // char *overflow_arg_area;
1455 // /* location on stack that holds
1456 // * the next overflow argument
1458 // char *reg_save_area;
1459 // /* where r3:r10 and f1:f8 (if saved)
1465 SDValue ArgGPR = DAG.getConstant(FuncInfo->getVarArgsNumGPR(), MVT::i32);
1466 SDValue ArgFPR = DAG.getConstant(FuncInfo->getVarArgsNumFPR(), MVT::i32);
1469 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1471 SDValue StackOffsetFI = DAG.getFrameIndex(FuncInfo->getVarArgsStackOffset(),
1473 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
1476 uint64_t FrameOffset = PtrVT.getSizeInBits()/8;
1477 SDValue ConstFrameOffset = DAG.getConstant(FrameOffset, PtrVT);
1479 uint64_t StackOffset = PtrVT.getSizeInBits()/8 - 1;
1480 SDValue ConstStackOffset = DAG.getConstant(StackOffset, PtrVT);
1482 uint64_t FPROffset = 1;
1483 SDValue ConstFPROffset = DAG.getConstant(FPROffset, PtrVT);
1485 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1487 // Store first byte : number of int regs
1488 SDValue firstStore = DAG.getTruncStore(Op.getOperand(0), dl, ArgGPR,
1490 MachinePointerInfo(SV),
1491 MVT::i8, false, false, 0);
1492 uint64_t nextOffset = FPROffset;
1493 SDValue nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, Op.getOperand(1),
1496 // Store second byte : number of float regs
1497 SDValue secondStore =
1498 DAG.getTruncStore(firstStore, dl, ArgFPR, nextPtr,
1499 MachinePointerInfo(SV, nextOffset), MVT::i8,
1501 nextOffset += StackOffset;
1502 nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, nextPtr, ConstStackOffset);
1504 // Store second word : arguments given on stack
1505 SDValue thirdStore =
1506 DAG.getStore(secondStore, dl, StackOffsetFI, nextPtr,
1507 MachinePointerInfo(SV, nextOffset),
1509 nextOffset += FrameOffset;
1510 nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, nextPtr, ConstFrameOffset);
1512 // Store third word : arguments given in registers
1513 return DAG.getStore(thirdStore, dl, FR, nextPtr,
1514 MachinePointerInfo(SV, nextOffset),
1519 #include "PPCGenCallingConv.inc"
1521 static bool CC_PPC_SVR4_Custom_Dummy(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
1522 CCValAssign::LocInfo &LocInfo,
1523 ISD::ArgFlagsTy &ArgFlags,
1528 static bool CC_PPC_SVR4_Custom_AlignArgRegs(unsigned &ValNo, MVT &ValVT,
1530 CCValAssign::LocInfo &LocInfo,
1531 ISD::ArgFlagsTy &ArgFlags,
1533 static const unsigned ArgRegs[] = {
1534 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
1535 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
1537 const unsigned NumArgRegs = array_lengthof(ArgRegs);
1539 unsigned RegNum = State.getFirstUnallocated(ArgRegs, NumArgRegs);
1541 // Skip one register if the first unallocated register has an even register
1542 // number and there are still argument registers available which have not been
1543 // allocated yet. RegNum is actually an index into ArgRegs, which means we
1544 // need to skip a register if RegNum is odd.
1545 if (RegNum != NumArgRegs && RegNum % 2 == 1) {
1546 State.AllocateReg(ArgRegs[RegNum]);
1549 // Always return false here, as this function only makes sure that the first
1550 // unallocated register has an odd register number and does not actually
1551 // allocate a register for the current argument.
1555 static bool CC_PPC_SVR4_Custom_AlignFPArgRegs(unsigned &ValNo, MVT &ValVT,
1557 CCValAssign::LocInfo &LocInfo,
1558 ISD::ArgFlagsTy &ArgFlags,
1560 static const unsigned ArgRegs[] = {
1561 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
1565 const unsigned NumArgRegs = array_lengthof(ArgRegs);
1567 unsigned RegNum = State.getFirstUnallocated(ArgRegs, NumArgRegs);
1569 // If there is only one Floating-point register left we need to put both f64
1570 // values of a split ppc_fp128 value on the stack.
1571 if (RegNum != NumArgRegs && ArgRegs[RegNum] == PPC::F8) {
1572 State.AllocateReg(ArgRegs[RegNum]);
1575 // Always return false here, as this function only makes sure that the two f64
1576 // values a ppc_fp128 value is split into are both passed in registers or both
1577 // passed on the stack and does not actually allocate a register for the
1578 // current argument.
1582 /// GetFPR - Get the set of FP registers that should be allocated for arguments,
1584 static const unsigned *GetFPR() {
1585 static const unsigned FPR[] = {
1586 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
1587 PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
1593 /// CalculateStackSlotSize - Calculates the size reserved for this argument on
1595 static unsigned CalculateStackSlotSize(EVT ArgVT, ISD::ArgFlagsTy Flags,
1596 unsigned PtrByteSize) {
1597 unsigned ArgSize = ArgVT.getSizeInBits()/8;
1598 if (Flags.isByVal())
1599 ArgSize = Flags.getByValSize();
1600 ArgSize = ((ArgSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
1606 PPCTargetLowering::LowerFormalArguments(SDValue Chain,
1607 CallingConv::ID CallConv, bool isVarArg,
1608 const SmallVectorImpl<ISD::InputArg>
1610 DebugLoc dl, SelectionDAG &DAG,
1611 SmallVectorImpl<SDValue> &InVals)
1613 if (PPCSubTarget.isSVR4ABI() && !PPCSubTarget.isPPC64()) {
1614 return LowerFormalArguments_SVR4(Chain, CallConv, isVarArg, Ins,
1617 return LowerFormalArguments_Darwin(Chain, CallConv, isVarArg, Ins,
1623 PPCTargetLowering::LowerFormalArguments_SVR4(
1625 CallingConv::ID CallConv, bool isVarArg,
1626 const SmallVectorImpl<ISD::InputArg>
1628 DebugLoc dl, SelectionDAG &DAG,
1629 SmallVectorImpl<SDValue> &InVals) const {
1631 // 32-bit SVR4 ABI Stack Frame Layout:
1632 // +-----------------------------------+
1633 // +--> | Back chain |
1634 // | +-----------------------------------+
1635 // | | Floating-point register save area |
1636 // | +-----------------------------------+
1637 // | | General register save area |
1638 // | +-----------------------------------+
1639 // | | CR save word |
1640 // | +-----------------------------------+
1641 // | | VRSAVE save word |
1642 // | +-----------------------------------+
1643 // | | Alignment padding |
1644 // | +-----------------------------------+
1645 // | | Vector register save area |
1646 // | +-----------------------------------+
1647 // | | Local variable space |
1648 // | +-----------------------------------+
1649 // | | Parameter list area |
1650 // | +-----------------------------------+
1651 // | | LR save word |
1652 // | +-----------------------------------+
1653 // SP--> +--- | Back chain |
1654 // +-----------------------------------+
1657 // System V Application Binary Interface PowerPC Processor Supplement
1658 // AltiVec Technology Programming Interface Manual
1660 MachineFunction &MF = DAG.getMachineFunction();
1661 MachineFrameInfo *MFI = MF.getFrameInfo();
1662 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
1664 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1665 // Potential tail calls could cause overwriting of argument stack slots.
1666 bool isImmutable = !(GuaranteedTailCallOpt && (CallConv==CallingConv::Fast));
1667 unsigned PtrByteSize = 4;
1669 // Assign locations to all of the incoming arguments.
1670 SmallVector<CCValAssign, 16> ArgLocs;
1671 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1672 getTargetMachine(), ArgLocs, *DAG.getContext());
1674 // Reserve space for the linkage area on the stack.
1675 CCInfo.AllocateStack(PPCFrameLowering::getLinkageSize(false, false), PtrByteSize);
1677 CCInfo.AnalyzeFormalArguments(Ins, CC_PPC_SVR4);
1679 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1680 CCValAssign &VA = ArgLocs[i];
1682 // Arguments stored in registers.
1683 if (VA.isRegLoc()) {
1684 TargetRegisterClass *RC;
1685 EVT ValVT = VA.getValVT();
1687 switch (ValVT.getSimpleVT().SimpleTy) {
1689 llvm_unreachable("ValVT not supported by formal arguments Lowering");
1691 RC = PPC::GPRCRegisterClass;
1694 RC = PPC::F4RCRegisterClass;
1697 RC = PPC::F8RCRegisterClass;
1703 RC = PPC::VRRCRegisterClass;
1707 // Transform the arguments stored in physical registers into virtual ones.
1708 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
1709 SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, ValVT);
1711 InVals.push_back(ArgValue);
1713 // Argument stored in memory.
1714 assert(VA.isMemLoc());
1716 unsigned ArgSize = VA.getLocVT().getSizeInBits() / 8;
1717 int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset(),
1720 // Create load nodes to retrieve arguments from the stack.
1721 SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
1722 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
1723 MachinePointerInfo(),
1728 // Assign locations to all of the incoming aggregate by value arguments.
1729 // Aggregates passed by value are stored in the local variable space of the
1730 // caller's stack frame, right above the parameter list area.
1731 SmallVector<CCValAssign, 16> ByValArgLocs;
1732 CCState CCByValInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1733 getTargetMachine(), ByValArgLocs, *DAG.getContext());
1735 // Reserve stack space for the allocations in CCInfo.
1736 CCByValInfo.AllocateStack(CCInfo.getNextStackOffset(), PtrByteSize);
1738 CCByValInfo.AnalyzeFormalArguments(Ins, CC_PPC_SVR4_ByVal);
1740 // Area that is at least reserved in the caller of this function.
1741 unsigned MinReservedArea = CCByValInfo.getNextStackOffset();
1743 // Set the size that is at least reserved in caller of this function. Tail
1744 // call optimized function's reserved stack space needs to be aligned so that
1745 // taking the difference between two stack areas will result in an aligned
1747 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
1750 std::max(MinReservedArea,
1751 PPCFrameLowering::getMinCallFrameSize(false, false));
1753 unsigned TargetAlign = DAG.getMachineFunction().getTarget().getFrameLowering()->
1754 getStackAlignment();
1755 unsigned AlignMask = TargetAlign-1;
1756 MinReservedArea = (MinReservedArea + AlignMask) & ~AlignMask;
1758 FI->setMinReservedArea(MinReservedArea);
1760 SmallVector<SDValue, 8> MemOps;
1762 // If the function takes variable number of arguments, make a frame index for
1763 // the start of the first vararg value... for expansion of llvm.va_start.
1765 static const unsigned GPArgRegs[] = {
1766 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
1767 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
1769 const unsigned NumGPArgRegs = array_lengthof(GPArgRegs);
1771 static const unsigned FPArgRegs[] = {
1772 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
1775 const unsigned NumFPArgRegs = array_lengthof(FPArgRegs);
1777 FuncInfo->setVarArgsNumGPR(CCInfo.getFirstUnallocated(GPArgRegs,
1779 FuncInfo->setVarArgsNumFPR(CCInfo.getFirstUnallocated(FPArgRegs,
1782 // Make room for NumGPArgRegs and NumFPArgRegs.
1783 int Depth = NumGPArgRegs * PtrVT.getSizeInBits()/8 +
1784 NumFPArgRegs * EVT(MVT::f64).getSizeInBits()/8;
1786 FuncInfo->setVarArgsStackOffset(
1787 MFI->CreateFixedObject(PtrVT.getSizeInBits()/8,
1788 CCInfo.getNextStackOffset(), true));
1790 FuncInfo->setVarArgsFrameIndex(MFI->CreateStackObject(Depth, 8, false));
1791 SDValue FIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
1793 // The fixed integer arguments of a variadic function are stored to the
1794 // VarArgsFrameIndex on the stack so that they may be loaded by deferencing
1795 // the result of va_next.
1796 for (unsigned GPRIndex = 0; GPRIndex != NumGPArgRegs; ++GPRIndex) {
1797 // Get an existing live-in vreg, or add a new one.
1798 unsigned VReg = MF.getRegInfo().getLiveInVirtReg(GPArgRegs[GPRIndex]);
1800 VReg = MF.addLiveIn(GPArgRegs[GPRIndex], &PPC::GPRCRegClass);
1802 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
1803 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
1804 MachinePointerInfo(), false, false, 0);
1805 MemOps.push_back(Store);
1806 // Increment the address by four for the next argument to store
1807 SDValue PtrOff = DAG.getConstant(PtrVT.getSizeInBits()/8, PtrVT);
1808 FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
1811 // FIXME 32-bit SVR4: We only need to save FP argument registers if CR bit 6
1813 // The double arguments are stored to the VarArgsFrameIndex
1815 for (unsigned FPRIndex = 0; FPRIndex != NumFPArgRegs; ++FPRIndex) {
1816 // Get an existing live-in vreg, or add a new one.
1817 unsigned VReg = MF.getRegInfo().getLiveInVirtReg(FPArgRegs[FPRIndex]);
1819 VReg = MF.addLiveIn(FPArgRegs[FPRIndex], &PPC::F8RCRegClass);
1821 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::f64);
1822 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
1823 MachinePointerInfo(), false, false, 0);
1824 MemOps.push_back(Store);
1825 // Increment the address by eight for the next argument to store
1826 SDValue PtrOff = DAG.getConstant(EVT(MVT::f64).getSizeInBits()/8,
1828 FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
1832 if (!MemOps.empty())
1833 Chain = DAG.getNode(ISD::TokenFactor, dl,
1834 MVT::Other, &MemOps[0], MemOps.size());
1840 PPCTargetLowering::LowerFormalArguments_Darwin(
1842 CallingConv::ID CallConv, bool isVarArg,
1843 const SmallVectorImpl<ISD::InputArg>
1845 DebugLoc dl, SelectionDAG &DAG,
1846 SmallVectorImpl<SDValue> &InVals) const {
1847 // TODO: add description of PPC stack frame format, or at least some docs.
1849 MachineFunction &MF = DAG.getMachineFunction();
1850 MachineFrameInfo *MFI = MF.getFrameInfo();
1851 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
1853 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1854 bool isPPC64 = PtrVT == MVT::i64;
1855 // Potential tail calls could cause overwriting of argument stack slots.
1856 bool isImmutable = !(GuaranteedTailCallOpt && (CallConv==CallingConv::Fast));
1857 unsigned PtrByteSize = isPPC64 ? 8 : 4;
1859 unsigned ArgOffset = PPCFrameLowering::getLinkageSize(isPPC64, true);
1860 // Area that is at least reserved in caller of this function.
1861 unsigned MinReservedArea = ArgOffset;
1863 static const unsigned GPR_32[] = { // 32-bit registers.
1864 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
1865 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
1867 static const unsigned GPR_64[] = { // 64-bit registers.
1868 PPC::X3, PPC::X4, PPC::X5, PPC::X6,
1869 PPC::X7, PPC::X8, PPC::X9, PPC::X10,
1872 static const unsigned *FPR = GetFPR();
1874 static const unsigned VR[] = {
1875 PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
1876 PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
1879 const unsigned Num_GPR_Regs = array_lengthof(GPR_32);
1880 const unsigned Num_FPR_Regs = 13;
1881 const unsigned Num_VR_Regs = array_lengthof( VR);
1883 unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
1885 const unsigned *GPR = isPPC64 ? GPR_64 : GPR_32;
1887 // In 32-bit non-varargs functions, the stack space for vectors is after the
1888 // stack space for non-vectors. We do not use this space unless we have
1889 // too many vectors to fit in registers, something that only occurs in
1890 // constructed examples:), but we have to walk the arglist to figure
1891 // that out...for the pathological case, compute VecArgOffset as the
1892 // start of the vector parameter area. Computing VecArgOffset is the
1893 // entire point of the following loop.
1894 unsigned VecArgOffset = ArgOffset;
1895 if (!isVarArg && !isPPC64) {
1896 for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e;
1898 EVT ObjectVT = Ins[ArgNo].VT;
1899 unsigned ObjSize = ObjectVT.getSizeInBits()/8;
1900 ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
1902 if (Flags.isByVal()) {
1903 // ObjSize is the true size, ArgSize rounded up to multiple of regs.
1904 ObjSize = Flags.getByValSize();
1906 ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
1907 VecArgOffset += ArgSize;
1911 switch(ObjectVT.getSimpleVT().SimpleTy) {
1912 default: llvm_unreachable("Unhandled argument type!");
1915 VecArgOffset += isPPC64 ? 8 : 4;
1917 case MVT::i64: // PPC64
1925 // Nothing to do, we're only looking at Nonvector args here.
1930 // We've found where the vector parameter area in memory is. Skip the
1931 // first 12 parameters; these don't use that memory.
1932 VecArgOffset = ((VecArgOffset+15)/16)*16;
1933 VecArgOffset += 12*16;
1935 // Add DAG nodes to load the arguments or copy them out of registers. On
1936 // entry to a function on PPC, the arguments start after the linkage area,
1937 // although the first ones are often in registers.
1939 SmallVector<SDValue, 8> MemOps;
1940 unsigned nAltivecParamsAtEnd = 0;
1941 for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
1943 bool needsLoad = false;
1944 EVT ObjectVT = Ins[ArgNo].VT;
1945 unsigned ObjSize = ObjectVT.getSizeInBits()/8;
1946 unsigned ArgSize = ObjSize;
1947 ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
1949 unsigned CurArgOffset = ArgOffset;
1951 // Varargs or 64 bit Altivec parameters are padded to a 16 byte boundary.
1952 if (ObjectVT==MVT::v4f32 || ObjectVT==MVT::v4i32 ||
1953 ObjectVT==MVT::v8i16 || ObjectVT==MVT::v16i8) {
1954 if (isVarArg || isPPC64) {
1955 MinReservedArea = ((MinReservedArea+15)/16)*16;
1956 MinReservedArea += CalculateStackSlotSize(ObjectVT,
1959 } else nAltivecParamsAtEnd++;
1961 // Calculate min reserved area.
1962 MinReservedArea += CalculateStackSlotSize(Ins[ArgNo].VT,
1966 // FIXME the codegen can be much improved in some cases.
1967 // We do not have to keep everything in memory.
1968 if (Flags.isByVal()) {
1969 // ObjSize is the true size, ArgSize rounded up to multiple of registers.
1970 ObjSize = Flags.getByValSize();
1971 ArgSize = ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
1972 // Objects of size 1 and 2 are right justified, everything else is
1973 // left justified. This means the memory address is adjusted forwards.
1974 if (ObjSize==1 || ObjSize==2) {
1975 CurArgOffset = CurArgOffset + (4 - ObjSize);
1977 // The value of the object is its address.
1978 int FI = MFI->CreateFixedObject(ObjSize, CurArgOffset, true);
1979 SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
1980 InVals.push_back(FIN);
1981 if (ObjSize==1 || ObjSize==2) {
1982 if (GPR_idx != Num_GPR_Regs) {
1985 VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
1987 VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
1988 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
1989 SDValue Store = DAG.getTruncStore(Val.getValue(1), dl, Val, FIN,
1990 MachinePointerInfo(),
1991 ObjSize==1 ? MVT::i8 : MVT::i16,
1993 MemOps.push_back(Store);
1997 ArgOffset += PtrByteSize;
2001 for (unsigned j = 0; j < ArgSize; j += PtrByteSize) {
2002 // Store whatever pieces of the object are in registers
2003 // to memory. ArgVal will be address of the beginning of
2005 if (GPR_idx != Num_GPR_Regs) {
2008 VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
2010 VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
2011 int FI = MFI->CreateFixedObject(PtrByteSize, ArgOffset, true);
2012 SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
2013 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
2014 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
2015 MachinePointerInfo(),
2017 MemOps.push_back(Store);
2019 ArgOffset += PtrByteSize;
2021 ArgOffset += ArgSize - (ArgOffset-CurArgOffset);
2028 switch (ObjectVT.getSimpleVT().SimpleTy) {
2029 default: llvm_unreachable("Unhandled argument type!");
2032 if (GPR_idx != Num_GPR_Regs) {
2033 unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
2034 ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
2038 ArgSize = PtrByteSize;
2040 // All int arguments reserve stack space in the Darwin ABI.
2041 ArgOffset += PtrByteSize;
2045 case MVT::i64: // PPC64
2046 if (GPR_idx != Num_GPR_Regs) {
2047 unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
2048 ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i64);
2050 if (ObjectVT == MVT::i32) {
2051 // PPC64 passes i8, i16, and i32 values in i64 registers. Promote
2052 // value to MVT::i64 and then truncate to the correct register size.
2054 ArgVal = DAG.getNode(ISD::AssertSext, dl, MVT::i64, ArgVal,
2055 DAG.getValueType(ObjectVT));
2056 else if (Flags.isZExt())
2057 ArgVal = DAG.getNode(ISD::AssertZext, dl, MVT::i64, ArgVal,
2058 DAG.getValueType(ObjectVT));
2060 ArgVal = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, ArgVal);
2066 ArgSize = PtrByteSize;
2068 // All int arguments reserve stack space in the Darwin ABI.
2074 // Every 4 bytes of argument space consumes one of the GPRs available for
2075 // argument passing.
2076 if (GPR_idx != Num_GPR_Regs) {
2078 if (ObjSize == 8 && GPR_idx != Num_GPR_Regs && !isPPC64)
2081 if (FPR_idx != Num_FPR_Regs) {
2084 if (ObjectVT == MVT::f32)
2085 VReg = MF.addLiveIn(FPR[FPR_idx], &PPC::F4RCRegClass);
2087 VReg = MF.addLiveIn(FPR[FPR_idx], &PPC::F8RCRegClass);
2089 ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
2095 // All FP arguments reserve stack space in the Darwin ABI.
2096 ArgOffset += isPPC64 ? 8 : ObjSize;
2102 // Note that vector arguments in registers don't reserve stack space,
2103 // except in varargs functions.
2104 if (VR_idx != Num_VR_Regs) {
2105 unsigned VReg = MF.addLiveIn(VR[VR_idx], &PPC::VRRCRegClass);
2106 ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
2108 while ((ArgOffset % 16) != 0) {
2109 ArgOffset += PtrByteSize;
2110 if (GPR_idx != Num_GPR_Regs)
2114 GPR_idx = std::min(GPR_idx+4, Num_GPR_Regs); // FIXME correct for ppc64?
2118 if (!isVarArg && !isPPC64) {
2119 // Vectors go after all the nonvectors.
2120 CurArgOffset = VecArgOffset;
2123 // Vectors are aligned.
2124 ArgOffset = ((ArgOffset+15)/16)*16;
2125 CurArgOffset = ArgOffset;
2133 // We need to load the argument to a virtual register if we determined above
2134 // that we ran out of physical registers of the appropriate type.
2136 int FI = MFI->CreateFixedObject(ObjSize,
2137 CurArgOffset + (ArgSize - ObjSize),
2139 SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
2140 ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, MachinePointerInfo(),
2144 InVals.push_back(ArgVal);
2147 // Set the size that is at least reserved in caller of this function. Tail
2148 // call optimized function's reserved stack space needs to be aligned so that
2149 // taking the difference between two stack areas will result in an aligned
2151 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
2152 // Add the Altivec parameters at the end, if needed.
2153 if (nAltivecParamsAtEnd) {
2154 MinReservedArea = ((MinReservedArea+15)/16)*16;
2155 MinReservedArea += 16*nAltivecParamsAtEnd;
2158 std::max(MinReservedArea,
2159 PPCFrameLowering::getMinCallFrameSize(isPPC64, true));
2160 unsigned TargetAlign = DAG.getMachineFunction().getTarget().getFrameLowering()->
2161 getStackAlignment();
2162 unsigned AlignMask = TargetAlign-1;
2163 MinReservedArea = (MinReservedArea + AlignMask) & ~AlignMask;
2164 FI->setMinReservedArea(MinReservedArea);
2166 // If the function takes variable number of arguments, make a frame index for
2167 // the start of the first vararg value... for expansion of llvm.va_start.
2169 int Depth = ArgOffset;
2171 FuncInfo->setVarArgsFrameIndex(
2172 MFI->CreateFixedObject(PtrVT.getSizeInBits()/8,
2174 SDValue FIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
2176 // If this function is vararg, store any remaining integer argument regs
2177 // to their spots on the stack so that they may be loaded by deferencing the
2178 // result of va_next.
2179 for (; GPR_idx != Num_GPR_Regs; ++GPR_idx) {
2183 VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
2185 VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
2187 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
2188 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
2189 MachinePointerInfo(), false, false, 0);
2190 MemOps.push_back(Store);
2191 // Increment the address by four for the next argument to store
2192 SDValue PtrOff = DAG.getConstant(PtrVT.getSizeInBits()/8, PtrVT);
2193 FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
2197 if (!MemOps.empty())
2198 Chain = DAG.getNode(ISD::TokenFactor, dl,
2199 MVT::Other, &MemOps[0], MemOps.size());
2204 /// CalculateParameterAndLinkageAreaSize - Get the size of the paramter plus
2205 /// linkage area for the Darwin ABI.
2207 CalculateParameterAndLinkageAreaSize(SelectionDAG &DAG,
2211 const SmallVectorImpl<ISD::OutputArg>
2213 const SmallVectorImpl<SDValue> &OutVals,
2214 unsigned &nAltivecParamsAtEnd) {
2215 // Count how many bytes are to be pushed on the stack, including the linkage
2216 // area, and parameter passing area. We start with 24/48 bytes, which is
2217 // prereserved space for [SP][CR][LR][3 x unused].
2218 unsigned NumBytes = PPCFrameLowering::getLinkageSize(isPPC64, true);
2219 unsigned NumOps = Outs.size();
2220 unsigned PtrByteSize = isPPC64 ? 8 : 4;
2222 // Add up all the space actually used.
2223 // In 32-bit non-varargs calls, Altivec parameters all go at the end; usually
2224 // they all go in registers, but we must reserve stack space for them for
2225 // possible use by the caller. In varargs or 64-bit calls, parameters are
2226 // assigned stack space in order, with padding so Altivec parameters are
2228 nAltivecParamsAtEnd = 0;
2229 for (unsigned i = 0; i != NumOps; ++i) {
2230 ISD::ArgFlagsTy Flags = Outs[i].Flags;
2231 EVT ArgVT = Outs[i].VT;
2232 // Varargs Altivec parameters are padded to a 16 byte boundary.
2233 if (ArgVT==MVT::v4f32 || ArgVT==MVT::v4i32 ||
2234 ArgVT==MVT::v8i16 || ArgVT==MVT::v16i8) {
2235 if (!isVarArg && !isPPC64) {
2236 // Non-varargs Altivec parameters go after all the non-Altivec
2237 // parameters; handle those later so we know how much padding we need.
2238 nAltivecParamsAtEnd++;
2241 // Varargs and 64-bit Altivec parameters are padded to 16 byte boundary.
2242 NumBytes = ((NumBytes+15)/16)*16;
2244 NumBytes += CalculateStackSlotSize(ArgVT, Flags, PtrByteSize);
2247 // Allow for Altivec parameters at the end, if needed.
2248 if (nAltivecParamsAtEnd) {
2249 NumBytes = ((NumBytes+15)/16)*16;
2250 NumBytes += 16*nAltivecParamsAtEnd;
2253 // The prolog code of the callee may store up to 8 GPR argument registers to
2254 // the stack, allowing va_start to index over them in memory if its varargs.
2255 // Because we cannot tell if this is needed on the caller side, we have to
2256 // conservatively assume that it is needed. As such, make sure we have at
2257 // least enough stack space for the caller to store the 8 GPRs.
2258 NumBytes = std::max(NumBytes,
2259 PPCFrameLowering::getMinCallFrameSize(isPPC64, true));
2261 // Tail call needs the stack to be aligned.
2262 if (CC==CallingConv::Fast && GuaranteedTailCallOpt) {
2263 unsigned TargetAlign = DAG.getMachineFunction().getTarget().getFrameLowering()->
2264 getStackAlignment();
2265 unsigned AlignMask = TargetAlign-1;
2266 NumBytes = (NumBytes + AlignMask) & ~AlignMask;
2272 /// CalculateTailCallSPDiff - Get the amount the stack pointer has to be
2273 /// adjusted to accommodate the arguments for the tailcall.
2274 static int CalculateTailCallSPDiff(SelectionDAG& DAG, bool isTailCall,
2275 unsigned ParamSize) {
2277 if (!isTailCall) return 0;
2279 PPCFunctionInfo *FI = DAG.getMachineFunction().getInfo<PPCFunctionInfo>();
2280 unsigned CallerMinReservedArea = FI->getMinReservedArea();
2281 int SPDiff = (int)CallerMinReservedArea - (int)ParamSize;
2282 // Remember only if the new adjustement is bigger.
2283 if (SPDiff < FI->getTailCallSPDelta())
2284 FI->setTailCallSPDelta(SPDiff);
2289 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
2290 /// for tail call optimization. Targets which want to do tail call
2291 /// optimization should implement this function.
2293 PPCTargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
2294 CallingConv::ID CalleeCC,
2296 const SmallVectorImpl<ISD::InputArg> &Ins,
2297 SelectionDAG& DAG) const {
2298 if (!GuaranteedTailCallOpt)
2301 // Variable argument functions are not supported.
2305 MachineFunction &MF = DAG.getMachineFunction();
2306 CallingConv::ID CallerCC = MF.getFunction()->getCallingConv();
2307 if (CalleeCC == CallingConv::Fast && CallerCC == CalleeCC) {
2308 // Functions containing by val parameters are not supported.
2309 for (unsigned i = 0; i != Ins.size(); i++) {
2310 ISD::ArgFlagsTy Flags = Ins[i].Flags;
2311 if (Flags.isByVal()) return false;
2314 // Non PIC/GOT tail calls are supported.
2315 if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
2318 // At the moment we can only do local tail calls (in same module, hidden
2319 // or protected) if we are generating PIC.
2320 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
2321 return G->getGlobal()->hasHiddenVisibility()
2322 || G->getGlobal()->hasProtectedVisibility();
2328 /// isCallCompatibleAddress - Return the immediate to use if the specified
2329 /// 32-bit value is representable in the immediate field of a BxA instruction.
2330 static SDNode *isBLACompatibleAddress(SDValue Op, SelectionDAG &DAG) {
2331 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
2334 int Addr = C->getZExtValue();
2335 if ((Addr & 3) != 0 || // Low 2 bits are implicitly zero.
2336 (Addr << 6 >> 6) != Addr)
2337 return 0; // Top 6 bits have to be sext of immediate.
2339 return DAG.getConstant((int)C->getZExtValue() >> 2,
2340 DAG.getTargetLoweringInfo().getPointerTy()).getNode();
2345 struct TailCallArgumentInfo {
2350 TailCallArgumentInfo() : FrameIdx(0) {}
2355 /// StoreTailCallArgumentsToStackSlot - Stores arguments to their stack slot.
2357 StoreTailCallArgumentsToStackSlot(SelectionDAG &DAG,
2359 const SmallVector<TailCallArgumentInfo, 8> &TailCallArgs,
2360 SmallVector<SDValue, 8> &MemOpChains,
2362 for (unsigned i = 0, e = TailCallArgs.size(); i != e; ++i) {
2363 SDValue Arg = TailCallArgs[i].Arg;
2364 SDValue FIN = TailCallArgs[i].FrameIdxOp;
2365 int FI = TailCallArgs[i].FrameIdx;
2366 // Store relative to framepointer.
2367 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, FIN,
2368 MachinePointerInfo::getFixedStack(FI),
2373 /// EmitTailCallStoreFPAndRetAddr - Move the frame pointer and return address to
2374 /// the appropriate stack slot for the tail call optimized function call.
2375 static SDValue EmitTailCallStoreFPAndRetAddr(SelectionDAG &DAG,
2376 MachineFunction &MF,
2385 // Calculate the new stack slot for the return address.
2386 int SlotSize = isPPC64 ? 8 : 4;
2387 int NewRetAddrLoc = SPDiff + PPCFrameLowering::getReturnSaveOffset(isPPC64,
2389 int NewRetAddr = MF.getFrameInfo()->CreateFixedObject(SlotSize,
2390 NewRetAddrLoc, true);
2391 EVT VT = isPPC64 ? MVT::i64 : MVT::i32;
2392 SDValue NewRetAddrFrIdx = DAG.getFrameIndex(NewRetAddr, VT);
2393 Chain = DAG.getStore(Chain, dl, OldRetAddr, NewRetAddrFrIdx,
2394 MachinePointerInfo::getFixedStack(NewRetAddr),
2397 // When using the 32/64-bit SVR4 ABI there is no need to move the FP stack
2398 // slot as the FP is never overwritten.
2401 SPDiff + PPCFrameLowering::getFramePointerSaveOffset(isPPC64, isDarwinABI);
2402 int NewFPIdx = MF.getFrameInfo()->CreateFixedObject(SlotSize, NewFPLoc,
2404 SDValue NewFramePtrIdx = DAG.getFrameIndex(NewFPIdx, VT);
2405 Chain = DAG.getStore(Chain, dl, OldFP, NewFramePtrIdx,
2406 MachinePointerInfo::getFixedStack(NewFPIdx),
2413 /// CalculateTailCallArgDest - Remember Argument for later processing. Calculate
2414 /// the position of the argument.
2416 CalculateTailCallArgDest(SelectionDAG &DAG, MachineFunction &MF, bool isPPC64,
2417 SDValue Arg, int SPDiff, unsigned ArgOffset,
2418 SmallVector<TailCallArgumentInfo, 8>& TailCallArguments) {
2419 int Offset = ArgOffset + SPDiff;
2420 uint32_t OpSize = (Arg.getValueType().getSizeInBits()+7)/8;
2421 int FI = MF.getFrameInfo()->CreateFixedObject(OpSize, Offset, true);
2422 EVT VT = isPPC64 ? MVT::i64 : MVT::i32;
2423 SDValue FIN = DAG.getFrameIndex(FI, VT);
2424 TailCallArgumentInfo Info;
2426 Info.FrameIdxOp = FIN;
2428 TailCallArguments.push_back(Info);
2431 /// EmitTCFPAndRetAddrLoad - Emit load from frame pointer and return address
2432 /// stack slot. Returns the chain as result and the loaded frame pointers in
2433 /// LROpOut/FPOpout. Used when tail calling.
2434 SDValue PPCTargetLowering::EmitTailCallLoadFPAndRetAddr(SelectionDAG & DAG,
2440 DebugLoc dl) const {
2442 // Load the LR and FP stack slot for later adjusting.
2443 EVT VT = PPCSubTarget.isPPC64() ? MVT::i64 : MVT::i32;
2444 LROpOut = getReturnAddrFrameIndex(DAG);
2445 LROpOut = DAG.getLoad(VT, dl, Chain, LROpOut, MachinePointerInfo(),
2447 Chain = SDValue(LROpOut.getNode(), 1);
2449 // When using the 32/64-bit SVR4 ABI there is no need to load the FP stack
2450 // slot as the FP is never overwritten.
2452 FPOpOut = getFramePointerFrameIndex(DAG);
2453 FPOpOut = DAG.getLoad(VT, dl, Chain, FPOpOut, MachinePointerInfo(),
2455 Chain = SDValue(FPOpOut.getNode(), 1);
2461 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
2462 /// by "Src" to address "Dst" of size "Size". Alignment information is
2463 /// specified by the specific parameter attribute. The copy will be passed as
2464 /// a byval function parameter.
2465 /// Sometimes what we are copying is the end of a larger object, the part that
2466 /// does not fit in registers.
2468 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
2469 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
2471 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
2472 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
2473 false, false, MachinePointerInfo(0),
2474 MachinePointerInfo(0));
2477 /// LowerMemOpCallTo - Store the argument to the stack or remember it in case of
2480 LowerMemOpCallTo(SelectionDAG &DAG, MachineFunction &MF, SDValue Chain,
2481 SDValue Arg, SDValue PtrOff, int SPDiff,
2482 unsigned ArgOffset, bool isPPC64, bool isTailCall,
2483 bool isVector, SmallVector<SDValue, 8> &MemOpChains,
2484 SmallVector<TailCallArgumentInfo, 8> &TailCallArguments,
2486 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2491 StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
2493 StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
2494 PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
2495 DAG.getConstant(ArgOffset, PtrVT));
2497 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
2498 MachinePointerInfo(), false, false, 0));
2499 // Calculate and remember argument location.
2500 } else CalculateTailCallArgDest(DAG, MF, isPPC64, Arg, SPDiff, ArgOffset,
2505 void PrepareTailCall(SelectionDAG &DAG, SDValue &InFlag, SDValue &Chain,
2506 DebugLoc dl, bool isPPC64, int SPDiff, unsigned NumBytes,
2507 SDValue LROp, SDValue FPOp, bool isDarwinABI,
2508 SmallVector<TailCallArgumentInfo, 8> &TailCallArguments) {
2509 MachineFunction &MF = DAG.getMachineFunction();
2511 // Emit a sequence of copyto/copyfrom virtual registers for arguments that
2512 // might overwrite each other in case of tail call optimization.
2513 SmallVector<SDValue, 8> MemOpChains2;
2514 // Do not flag preceding copytoreg stuff together with the following stuff.
2516 StoreTailCallArgumentsToStackSlot(DAG, Chain, TailCallArguments,
2518 if (!MemOpChains2.empty())
2519 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
2520 &MemOpChains2[0], MemOpChains2.size());
2522 // Store the return address to the appropriate stack slot.
2523 Chain = EmitTailCallStoreFPAndRetAddr(DAG, MF, Chain, LROp, FPOp, SPDiff,
2524 isPPC64, isDarwinABI, dl);
2526 // Emit callseq_end just before tailcall node.
2527 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
2528 DAG.getIntPtrConstant(0, true), InFlag);
2529 InFlag = Chain.getValue(1);
2533 unsigned PrepareCall(SelectionDAG &DAG, SDValue &Callee, SDValue &InFlag,
2534 SDValue &Chain, DebugLoc dl, int SPDiff, bool isTailCall,
2535 SmallVector<std::pair<unsigned, SDValue>, 8> &RegsToPass,
2536 SmallVector<SDValue, 8> &Ops, std::vector<EVT> &NodeTys,
2537 const PPCSubtarget &PPCSubTarget) {
2539 bool isPPC64 = PPCSubTarget.isPPC64();
2540 bool isSVR4ABI = PPCSubTarget.isSVR4ABI();
2542 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2543 NodeTys.push_back(MVT::Other); // Returns a chain
2544 NodeTys.push_back(MVT::Glue); // Returns a flag for retval copy to use.
2546 unsigned CallOpc = isSVR4ABI ? PPCISD::CALL_SVR4 : PPCISD::CALL_Darwin;
2548 bool needIndirectCall = true;
2549 if (SDNode *Dest = isBLACompatibleAddress(Callee, DAG)) {
2550 // If this is an absolute destination address, use the munged value.
2551 Callee = SDValue(Dest, 0);
2552 needIndirectCall = false;
2555 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
2556 // XXX Work around for http://llvm.org/bugs/show_bug.cgi?id=5201
2557 // Use indirect calls for ALL functions calls in JIT mode, since the
2558 // far-call stubs may be outside relocation limits for a BL instruction.
2559 if (!DAG.getTarget().getSubtarget<PPCSubtarget>().isJITCodeModel()) {
2560 unsigned OpFlags = 0;
2561 if (DAG.getTarget().getRelocationModel() != Reloc::Static &&
2562 (PPCSubTarget.getTargetTriple().isMacOSX() &&
2563 PPCSubTarget.getTargetTriple().isMacOSXVersionLT(10, 5)) &&
2564 (G->getGlobal()->isDeclaration() ||
2565 G->getGlobal()->isWeakForLinker())) {
2566 // PC-relative references to external symbols should go through $stub,
2567 // unless we're building with the leopard linker or later, which
2568 // automatically synthesizes these stubs.
2569 OpFlags = PPCII::MO_DARWIN_STUB;
2572 // If the callee is a GlobalAddress/ExternalSymbol node (quite common,
2573 // every direct call is) turn it into a TargetGlobalAddress /
2574 // TargetExternalSymbol node so that legalize doesn't hack it.
2575 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
2576 Callee.getValueType(),
2578 needIndirectCall = false;
2582 if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
2583 unsigned char OpFlags = 0;
2585 if (DAG.getTarget().getRelocationModel() != Reloc::Static &&
2586 (PPCSubTarget.getTargetTriple().isMacOSX() &&
2587 PPCSubTarget.getTargetTriple().isMacOSXVersionLT(10, 5))) {
2588 // PC-relative references to external symbols should go through $stub,
2589 // unless we're building with the leopard linker or later, which
2590 // automatically synthesizes these stubs.
2591 OpFlags = PPCII::MO_DARWIN_STUB;
2594 Callee = DAG.getTargetExternalSymbol(S->getSymbol(), Callee.getValueType(),
2596 needIndirectCall = false;
2599 if (needIndirectCall) {
2600 // Otherwise, this is an indirect call. We have to use a MTCTR/BCTRL pair
2601 // to do the call, we can't use PPCISD::CALL.
2602 SDValue MTCTROps[] = {Chain, Callee, InFlag};
2604 if (isSVR4ABI && isPPC64) {
2605 // Function pointers in the 64-bit SVR4 ABI do not point to the function
2606 // entry point, but to the function descriptor (the function entry point
2607 // address is part of the function descriptor though).
2608 // The function descriptor is a three doubleword structure with the
2609 // following fields: function entry point, TOC base address and
2610 // environment pointer.
2611 // Thus for a call through a function pointer, the following actions need
2613 // 1. Save the TOC of the caller in the TOC save area of its stack
2614 // frame (this is done in LowerCall_Darwin()).
2615 // 2. Load the address of the function entry point from the function
2617 // 3. Load the TOC of the callee from the function descriptor into r2.
2618 // 4. Load the environment pointer from the function descriptor into
2620 // 5. Branch to the function entry point address.
2621 // 6. On return of the callee, the TOC of the caller needs to be
2622 // restored (this is done in FinishCall()).
2624 // All those operations are flagged together to ensure that no other
2625 // operations can be scheduled in between. E.g. without flagging the
2626 // operations together, a TOC access in the caller could be scheduled
2627 // between the load of the callee TOC and the branch to the callee, which
2628 // results in the TOC access going through the TOC of the callee instead
2629 // of going through the TOC of the caller, which leads to incorrect code.
2631 // Load the address of the function entry point from the function
2633 SDVTList VTs = DAG.getVTList(MVT::i64, MVT::Other, MVT::Glue);
2634 SDValue LoadFuncPtr = DAG.getNode(PPCISD::LOAD, dl, VTs, MTCTROps,
2635 InFlag.getNode() ? 3 : 2);
2636 Chain = LoadFuncPtr.getValue(1);
2637 InFlag = LoadFuncPtr.getValue(2);
2639 // Load environment pointer into r11.
2640 // Offset of the environment pointer within the function descriptor.
2641 SDValue PtrOff = DAG.getIntPtrConstant(16);
2643 SDValue AddPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Callee, PtrOff);
2644 SDValue LoadEnvPtr = DAG.getNode(PPCISD::LOAD, dl, VTs, Chain, AddPtr,
2646 Chain = LoadEnvPtr.getValue(1);
2647 InFlag = LoadEnvPtr.getValue(2);
2649 SDValue EnvVal = DAG.getCopyToReg(Chain, dl, PPC::X11, LoadEnvPtr,
2651 Chain = EnvVal.getValue(0);
2652 InFlag = EnvVal.getValue(1);
2654 // Load TOC of the callee into r2. We are using a target-specific load
2655 // with r2 hard coded, because the result of a target-independent load
2656 // would never go directly into r2, since r2 is a reserved register (which
2657 // prevents the register allocator from allocating it), resulting in an
2658 // additional register being allocated and an unnecessary move instruction
2660 VTs = DAG.getVTList(MVT::Other, MVT::Glue);
2661 SDValue LoadTOCPtr = DAG.getNode(PPCISD::LOAD_TOC, dl, VTs, Chain,
2663 Chain = LoadTOCPtr.getValue(0);
2664 InFlag = LoadTOCPtr.getValue(1);
2666 MTCTROps[0] = Chain;
2667 MTCTROps[1] = LoadFuncPtr;
2668 MTCTROps[2] = InFlag;
2671 Chain = DAG.getNode(PPCISD::MTCTR, dl, NodeTys, MTCTROps,
2672 2 + (InFlag.getNode() != 0));
2673 InFlag = Chain.getValue(1);
2676 NodeTys.push_back(MVT::Other);
2677 NodeTys.push_back(MVT::Glue);
2678 Ops.push_back(Chain);
2679 CallOpc = isSVR4ABI ? PPCISD::BCTRL_SVR4 : PPCISD::BCTRL_Darwin;
2681 // Add CTR register as callee so a bctr can be emitted later.
2683 Ops.push_back(DAG.getRegister(isPPC64 ? PPC::CTR8 : PPC::CTR, PtrVT));
2686 // If this is a direct call, pass the chain and the callee.
2687 if (Callee.getNode()) {
2688 Ops.push_back(Chain);
2689 Ops.push_back(Callee);
2691 // If this is a tail call add stack pointer delta.
2693 Ops.push_back(DAG.getConstant(SPDiff, MVT::i32));
2695 // Add argument registers to the end of the list so that they are known live
2697 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
2698 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
2699 RegsToPass[i].second.getValueType()));
2705 PPCTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
2706 CallingConv::ID CallConv, bool isVarArg,
2707 const SmallVectorImpl<ISD::InputArg> &Ins,
2708 DebugLoc dl, SelectionDAG &DAG,
2709 SmallVectorImpl<SDValue> &InVals) const {
2711 SmallVector<CCValAssign, 16> RVLocs;
2712 CCState CCRetInfo(CallConv, isVarArg, DAG.getMachineFunction(),
2713 getTargetMachine(), RVLocs, *DAG.getContext());
2714 CCRetInfo.AnalyzeCallResult(Ins, RetCC_PPC);
2716 // Copy all of the result registers out of their specified physreg.
2717 for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
2718 CCValAssign &VA = RVLocs[i];
2719 EVT VT = VA.getValVT();
2720 assert(VA.isRegLoc() && "Can only return in registers!");
2721 Chain = DAG.getCopyFromReg(Chain, dl,
2722 VA.getLocReg(), VT, InFlag).getValue(1);
2723 InVals.push_back(Chain.getValue(0));
2724 InFlag = Chain.getValue(2);
2731 PPCTargetLowering::FinishCall(CallingConv::ID CallConv, DebugLoc dl,
2732 bool isTailCall, bool isVarArg,
2734 SmallVector<std::pair<unsigned, SDValue>, 8>
2736 SDValue InFlag, SDValue Chain,
2738 int SPDiff, unsigned NumBytes,
2739 const SmallVectorImpl<ISD::InputArg> &Ins,
2740 SmallVectorImpl<SDValue> &InVals) const {
2741 std::vector<EVT> NodeTys;
2742 SmallVector<SDValue, 8> Ops;
2743 unsigned CallOpc = PrepareCall(DAG, Callee, InFlag, Chain, dl, SPDiff,
2744 isTailCall, RegsToPass, Ops, NodeTys,
2747 // When performing tail call optimization the callee pops its arguments off
2748 // the stack. Account for this here so these bytes can be pushed back on in
2749 // PPCRegisterInfo::eliminateCallFramePseudoInstr.
2750 int BytesCalleePops =
2751 (CallConv==CallingConv::Fast && GuaranteedTailCallOpt) ? NumBytes : 0;
2753 if (InFlag.getNode())
2754 Ops.push_back(InFlag);
2758 // If this is the first return lowered for this function, add the regs
2759 // to the liveout set for the function.
2760 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
2761 SmallVector<CCValAssign, 16> RVLocs;
2762 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
2763 getTargetMachine(), RVLocs, *DAG.getContext());
2764 CCInfo.AnalyzeCallResult(Ins, RetCC_PPC);
2765 for (unsigned i = 0; i != RVLocs.size(); ++i)
2766 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
2769 assert(((Callee.getOpcode() == ISD::Register &&
2770 cast<RegisterSDNode>(Callee)->getReg() == PPC::CTR) ||
2771 Callee.getOpcode() == ISD::TargetExternalSymbol ||
2772 Callee.getOpcode() == ISD::TargetGlobalAddress ||
2773 isa<ConstantSDNode>(Callee)) &&
2774 "Expecting an global address, external symbol, absolute value or register");
2776 return DAG.getNode(PPCISD::TC_RETURN, dl, MVT::Other, &Ops[0], Ops.size());
2779 Chain = DAG.getNode(CallOpc, dl, NodeTys, &Ops[0], Ops.size());
2780 InFlag = Chain.getValue(1);
2782 // Add a NOP immediately after the branch instruction when using the 64-bit
2783 // SVR4 ABI. At link time, if caller and callee are in a different module and
2784 // thus have a different TOC, the call will be replaced with a call to a stub
2785 // function which saves the current TOC, loads the TOC of the callee and
2786 // branches to the callee. The NOP will be replaced with a load instruction
2787 // which restores the TOC of the caller from the TOC save slot of the current
2788 // stack frame. If caller and callee belong to the same module (and have the
2789 // same TOC), the NOP will remain unchanged.
2790 if (!isTailCall && PPCSubTarget.isSVR4ABI()&& PPCSubTarget.isPPC64()) {
2791 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
2792 if (CallOpc == PPCISD::BCTRL_SVR4) {
2793 // This is a call through a function pointer.
2794 // Restore the caller TOC from the save area into R2.
2795 // See PrepareCall() for more information about calls through function
2796 // pointers in the 64-bit SVR4 ABI.
2797 // We are using a target-specific load with r2 hard coded, because the
2798 // result of a target-independent load would never go directly into r2,
2799 // since r2 is a reserved register (which prevents the register allocator
2800 // from allocating it), resulting in an additional register being
2801 // allocated and an unnecessary move instruction being generated.
2802 Chain = DAG.getNode(PPCISD::TOC_RESTORE, dl, VTs, Chain, InFlag);
2803 InFlag = Chain.getValue(1);
2805 // Otherwise insert NOP.
2806 InFlag = DAG.getNode(PPCISD::NOP, dl, MVT::Glue, InFlag);
2810 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
2811 DAG.getIntPtrConstant(BytesCalleePops, true),
2814 InFlag = Chain.getValue(1);
2816 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
2817 Ins, dl, DAG, InVals);
2821 PPCTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
2822 CallingConv::ID CallConv, bool isVarArg,
2824 const SmallVectorImpl<ISD::OutputArg> &Outs,
2825 const SmallVectorImpl<SDValue> &OutVals,
2826 const SmallVectorImpl<ISD::InputArg> &Ins,
2827 DebugLoc dl, SelectionDAG &DAG,
2828 SmallVectorImpl<SDValue> &InVals) const {
2830 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv, isVarArg,
2833 if (PPCSubTarget.isSVR4ABI() && !PPCSubTarget.isPPC64())
2834 return LowerCall_SVR4(Chain, Callee, CallConv, isVarArg,
2835 isTailCall, Outs, OutVals, Ins,
2838 return LowerCall_Darwin(Chain, Callee, CallConv, isVarArg,
2839 isTailCall, Outs, OutVals, Ins,
2844 PPCTargetLowering::LowerCall_SVR4(SDValue Chain, SDValue Callee,
2845 CallingConv::ID CallConv, bool isVarArg,
2847 const SmallVectorImpl<ISD::OutputArg> &Outs,
2848 const SmallVectorImpl<SDValue> &OutVals,
2849 const SmallVectorImpl<ISD::InputArg> &Ins,
2850 DebugLoc dl, SelectionDAG &DAG,
2851 SmallVectorImpl<SDValue> &InVals) const {
2852 // See PPCTargetLowering::LowerFormalArguments_SVR4() for a description
2853 // of the 32-bit SVR4 ABI stack frame layout.
2855 assert((CallConv == CallingConv::C ||
2856 CallConv == CallingConv::Fast) && "Unknown calling convention!");
2858 unsigned PtrByteSize = 4;
2860 MachineFunction &MF = DAG.getMachineFunction();
2862 // Mark this function as potentially containing a function that contains a
2863 // tail call. As a consequence the frame pointer will be used for dynamicalloc
2864 // and restoring the callers stack pointer in this functions epilog. This is
2865 // done because by tail calling the called function might overwrite the value
2866 // in this function's (MF) stack pointer stack slot 0(SP).
2867 if (GuaranteedTailCallOpt && CallConv==CallingConv::Fast)
2868 MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
2870 // Count how many bytes are to be pushed on the stack, including the linkage
2871 // area, parameter list area and the part of the local variable space which
2872 // contains copies of aggregates which are passed by value.
2874 // Assign locations to all of the outgoing arguments.
2875 SmallVector<CCValAssign, 16> ArgLocs;
2876 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
2877 getTargetMachine(), ArgLocs, *DAG.getContext());
2879 // Reserve space for the linkage area on the stack.
2880 CCInfo.AllocateStack(PPCFrameLowering::getLinkageSize(false, false), PtrByteSize);
2883 // Handle fixed and variable vector arguments differently.
2884 // Fixed vector arguments go into registers as long as registers are
2885 // available. Variable vector arguments always go into memory.
2886 unsigned NumArgs = Outs.size();
2888 for (unsigned i = 0; i != NumArgs; ++i) {
2889 MVT ArgVT = Outs[i].VT;
2890 ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
2893 if (Outs[i].IsFixed) {
2894 Result = CC_PPC_SVR4(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags,
2897 Result = CC_PPC_SVR4_VarArg(i, ArgVT, ArgVT, CCValAssign::Full,
2903 errs() << "Call operand #" << i << " has unhandled type "
2904 << EVT(ArgVT).getEVTString() << "\n";
2906 llvm_unreachable(0);
2910 // All arguments are treated the same.
2911 CCInfo.AnalyzeCallOperands(Outs, CC_PPC_SVR4);
2914 // Assign locations to all of the outgoing aggregate by value arguments.
2915 SmallVector<CCValAssign, 16> ByValArgLocs;
2916 CCState CCByValInfo(CallConv, isVarArg, DAG.getMachineFunction(),
2917 getTargetMachine(), ByValArgLocs, *DAG.getContext());
2919 // Reserve stack space for the allocations in CCInfo.
2920 CCByValInfo.AllocateStack(CCInfo.getNextStackOffset(), PtrByteSize);
2922 CCByValInfo.AnalyzeCallOperands(Outs, CC_PPC_SVR4_ByVal);
2924 // Size of the linkage area, parameter list area and the part of the local
2925 // space variable where copies of aggregates which are passed by value are
2927 unsigned NumBytes = CCByValInfo.getNextStackOffset();
2929 // Calculate by how many bytes the stack has to be adjusted in case of tail
2930 // call optimization.
2931 int SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
2933 // Adjust the stack pointer for the new arguments...
2934 // These operations are automatically eliminated by the prolog/epilog pass
2935 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
2936 SDValue CallSeqStart = Chain;
2938 // Load the return address and frame pointer so it can be moved somewhere else
2941 Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp, false,
2944 // Set up a copy of the stack pointer for use loading and storing any
2945 // arguments that may not fit in the registers available for argument
2947 SDValue StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
2949 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
2950 SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
2951 SmallVector<SDValue, 8> MemOpChains;
2953 bool seenFloatArg = false;
2954 // Walk the register/memloc assignments, inserting copies/loads.
2955 for (unsigned i = 0, j = 0, e = ArgLocs.size();
2958 CCValAssign &VA = ArgLocs[i];
2959 SDValue Arg = OutVals[i];
2960 ISD::ArgFlagsTy Flags = Outs[i].Flags;
2962 if (Flags.isByVal()) {
2963 // Argument is an aggregate which is passed by value, thus we need to
2964 // create a copy of it in the local variable space of the current stack
2965 // frame (which is the stack frame of the caller) and pass the address of
2966 // this copy to the callee.
2967 assert((j < ByValArgLocs.size()) && "Index out of bounds!");
2968 CCValAssign &ByValVA = ByValArgLocs[j++];
2969 assert((VA.getValNo() == ByValVA.getValNo()) && "ValNo mismatch!");
2971 // Memory reserved in the local variable space of the callers stack frame.
2972 unsigned LocMemOffset = ByValVA.getLocMemOffset();
2974 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
2975 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
2977 // Create a copy of the argument in the local area of the current
2979 SDValue MemcpyCall =
2980 CreateCopyOfByValArgument(Arg, PtrOff,
2981 CallSeqStart.getNode()->getOperand(0),
2984 // This must go outside the CALLSEQ_START..END.
2985 SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall,
2986 CallSeqStart.getNode()->getOperand(1));
2987 DAG.ReplaceAllUsesWith(CallSeqStart.getNode(),
2988 NewCallSeqStart.getNode());
2989 Chain = CallSeqStart = NewCallSeqStart;
2991 // Pass the address of the aggregate copy on the stack either in a
2992 // physical register or in the parameter list area of the current stack
2993 // frame to the callee.
2997 if (VA.isRegLoc()) {
2998 seenFloatArg |= VA.getLocVT().isFloatingPoint();
2999 // Put argument in a physical register.
3000 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
3002 // Put argument in the parameter list area of the current stack frame.
3003 assert(VA.isMemLoc());
3004 unsigned LocMemOffset = VA.getLocMemOffset();
3007 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
3008 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
3010 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
3011 MachinePointerInfo(),
3014 // Calculate and remember argument location.
3015 CalculateTailCallArgDest(DAG, MF, false, Arg, SPDiff, LocMemOffset,
3021 if (!MemOpChains.empty())
3022 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3023 &MemOpChains[0], MemOpChains.size());
3025 // Set CR6 to true if this is a vararg call with floating args passed in
3028 SDValue SetCR(DAG.getMachineNode(seenFloatArg ? PPC::CRSET : PPC::CRUNSET,
3030 RegsToPass.push_back(std::make_pair(unsigned(PPC::CR1EQ), SetCR));
3033 // Build a sequence of copy-to-reg nodes chained together with token chain
3034 // and flag operands which copy the outgoing args into the appropriate regs.
3036 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
3037 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
3038 RegsToPass[i].second, InFlag);
3039 InFlag = Chain.getValue(1);
3043 PrepareTailCall(DAG, InFlag, Chain, dl, false, SPDiff, NumBytes, LROp, FPOp,
3044 false, TailCallArguments);
3046 return FinishCall(CallConv, dl, isTailCall, isVarArg, DAG,
3047 RegsToPass, InFlag, Chain, Callee, SPDiff, NumBytes,
3052 PPCTargetLowering::LowerCall_Darwin(SDValue Chain, SDValue Callee,
3053 CallingConv::ID CallConv, bool isVarArg,
3055 const SmallVectorImpl<ISD::OutputArg> &Outs,
3056 const SmallVectorImpl<SDValue> &OutVals,
3057 const SmallVectorImpl<ISD::InputArg> &Ins,
3058 DebugLoc dl, SelectionDAG &DAG,
3059 SmallVectorImpl<SDValue> &InVals) const {
3061 unsigned NumOps = Outs.size();
3063 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3064 bool isPPC64 = PtrVT == MVT::i64;
3065 unsigned PtrByteSize = isPPC64 ? 8 : 4;
3067 MachineFunction &MF = DAG.getMachineFunction();
3069 // Mark this function as potentially containing a function that contains a
3070 // tail call. As a consequence the frame pointer will be used for dynamicalloc
3071 // and restoring the callers stack pointer in this functions epilog. This is
3072 // done because by tail calling the called function might overwrite the value
3073 // in this function's (MF) stack pointer stack slot 0(SP).
3074 if (GuaranteedTailCallOpt && CallConv==CallingConv::Fast)
3075 MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
3077 unsigned nAltivecParamsAtEnd = 0;
3079 // Count how many bytes are to be pushed on the stack, including the linkage
3080 // area, and parameter passing area. We start with 24/48 bytes, which is
3081 // prereserved space for [SP][CR][LR][3 x unused].
3083 CalculateParameterAndLinkageAreaSize(DAG, isPPC64, isVarArg, CallConv,
3085 nAltivecParamsAtEnd);
3087 // Calculate by how many bytes the stack has to be adjusted in case of tail
3088 // call optimization.
3089 int SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
3091 // To protect arguments on the stack from being clobbered in a tail call,
3092 // force all the loads to happen before doing any other lowering.
3094 Chain = DAG.getStackArgumentTokenFactor(Chain);
3096 // Adjust the stack pointer for the new arguments...
3097 // These operations are automatically eliminated by the prolog/epilog pass
3098 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
3099 SDValue CallSeqStart = Chain;
3101 // Load the return address and frame pointer so it can be move somewhere else
3104 Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp, true,
3107 // Set up a copy of the stack pointer for use loading and storing any
3108 // arguments that may not fit in the registers available for argument
3112 StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
3114 StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
3116 // Figure out which arguments are going to go in registers, and which in
3117 // memory. Also, if this is a vararg function, floating point operations
3118 // must be stored to our stack, and loaded into integer regs as well, if
3119 // any integer regs are available for argument passing.
3120 unsigned ArgOffset = PPCFrameLowering::getLinkageSize(isPPC64, true);
3121 unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
3123 static const unsigned GPR_32[] = { // 32-bit registers.
3124 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
3125 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
3127 static const unsigned GPR_64[] = { // 64-bit registers.
3128 PPC::X3, PPC::X4, PPC::X5, PPC::X6,
3129 PPC::X7, PPC::X8, PPC::X9, PPC::X10,
3131 static const unsigned *FPR = GetFPR();
3133 static const unsigned VR[] = {
3134 PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
3135 PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
3137 const unsigned NumGPRs = array_lengthof(GPR_32);
3138 const unsigned NumFPRs = 13;
3139 const unsigned NumVRs = array_lengthof(VR);
3141 const unsigned *GPR = isPPC64 ? GPR_64 : GPR_32;
3143 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
3144 SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
3146 SmallVector<SDValue, 8> MemOpChains;
3147 for (unsigned i = 0; i != NumOps; ++i) {
3148 SDValue Arg = OutVals[i];
3149 ISD::ArgFlagsTy Flags = Outs[i].Flags;
3151 // PtrOff will be used to store the current argument to the stack if a
3152 // register cannot be found for it.
3155 PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
3157 PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
3159 // On PPC64, promote integers to 64-bit values.
3160 if (isPPC64 && Arg.getValueType() == MVT::i32) {
3161 // FIXME: Should this use ANY_EXTEND if neither sext nor zext?
3162 unsigned ExtOp = Flags.isSExt() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
3163 Arg = DAG.getNode(ExtOp, dl, MVT::i64, Arg);
3166 // FIXME memcpy is used way more than necessary. Correctness first.
3167 if (Flags.isByVal()) {
3168 unsigned Size = Flags.getByValSize();
3169 if (Size==1 || Size==2) {
3170 // Very small objects are passed right-justified.
3171 // Everything else is passed left-justified.
3172 EVT VT = (Size==1) ? MVT::i8 : MVT::i16;
3173 if (GPR_idx != NumGPRs) {
3174 SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, PtrVT, Chain, Arg,
3175 MachinePointerInfo(), VT,
3177 MemOpChains.push_back(Load.getValue(1));
3178 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
3180 ArgOffset += PtrByteSize;
3182 SDValue Const = DAG.getConstant(4 - Size, PtrOff.getValueType());
3183 SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, Const);
3184 SDValue MemcpyCall = CreateCopyOfByValArgument(Arg, AddPtr,
3185 CallSeqStart.getNode()->getOperand(0),
3187 // This must go outside the CALLSEQ_START..END.
3188 SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall,
3189 CallSeqStart.getNode()->getOperand(1));
3190 DAG.ReplaceAllUsesWith(CallSeqStart.getNode(),
3191 NewCallSeqStart.getNode());
3192 Chain = CallSeqStart = NewCallSeqStart;
3193 ArgOffset += PtrByteSize;
3197 // Copy entire object into memory. There are cases where gcc-generated
3198 // code assumes it is there, even if it could be put entirely into
3199 // registers. (This is not what the doc says.)
3200 SDValue MemcpyCall = CreateCopyOfByValArgument(Arg, PtrOff,
3201 CallSeqStart.getNode()->getOperand(0),
3203 // This must go outside the CALLSEQ_START..END.
3204 SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall,
3205 CallSeqStart.getNode()->getOperand(1));
3206 DAG.ReplaceAllUsesWith(CallSeqStart.getNode(), NewCallSeqStart.getNode());
3207 Chain = CallSeqStart = NewCallSeqStart;
3208 // And copy the pieces of it that fit into registers.
3209 for (unsigned j=0; j<Size; j+=PtrByteSize) {
3210 SDValue Const = DAG.getConstant(j, PtrOff.getValueType());
3211 SDValue AddArg = DAG.getNode(ISD::ADD, dl, PtrVT, Arg, Const);
3212 if (GPR_idx != NumGPRs) {
3213 SDValue Load = DAG.getLoad(PtrVT, dl, Chain, AddArg,
3214 MachinePointerInfo(),
3216 MemOpChains.push_back(Load.getValue(1));
3217 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
3218 ArgOffset += PtrByteSize;
3220 ArgOffset += ((Size - j + PtrByteSize-1)/PtrByteSize)*PtrByteSize;
3227 switch (Arg.getValueType().getSimpleVT().SimpleTy) {
3228 default: llvm_unreachable("Unexpected ValueType for argument!");
3231 if (GPR_idx != NumGPRs) {
3232 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Arg));
3234 LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
3235 isPPC64, isTailCall, false, MemOpChains,
3236 TailCallArguments, dl);
3238 ArgOffset += PtrByteSize;
3242 if (FPR_idx != NumFPRs) {
3243 RegsToPass.push_back(std::make_pair(FPR[FPR_idx++], Arg));
3246 SDValue Store = DAG.getStore(Chain, dl, Arg, PtrOff,
3247 MachinePointerInfo(), false, false, 0);
3248 MemOpChains.push_back(Store);
3250 // Float varargs are always shadowed in available integer registers
3251 if (GPR_idx != NumGPRs) {
3252 SDValue Load = DAG.getLoad(PtrVT, dl, Store, PtrOff,
3253 MachinePointerInfo(), false, false, 0);
3254 MemOpChains.push_back(Load.getValue(1));
3255 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
3257 if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 && !isPPC64){
3258 SDValue ConstFour = DAG.getConstant(4, PtrOff.getValueType());
3259 PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, ConstFour);
3260 SDValue Load = DAG.getLoad(PtrVT, dl, Store, PtrOff,
3261 MachinePointerInfo(),
3263 MemOpChains.push_back(Load.getValue(1));
3264 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
3267 // If we have any FPRs remaining, we may also have GPRs remaining.
3268 // Args passed in FPRs consume either 1 (f32) or 2 (f64) available
3270 if (GPR_idx != NumGPRs)
3272 if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 &&
3273 !isPPC64) // PPC64 has 64-bit GPR's obviously :)
3277 LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
3278 isPPC64, isTailCall, false, MemOpChains,
3279 TailCallArguments, dl);
3284 ArgOffset += Arg.getValueType() == MVT::f32 ? 4 : 8;
3291 // These go aligned on the stack, or in the corresponding R registers
3292 // when within range. The Darwin PPC ABI doc claims they also go in
3293 // V registers; in fact gcc does this only for arguments that are
3294 // prototyped, not for those that match the ... We do it for all
3295 // arguments, seems to work.
3296 while (ArgOffset % 16 !=0) {
3297 ArgOffset += PtrByteSize;
3298 if (GPR_idx != NumGPRs)
3301 // We could elide this store in the case where the object fits
3302 // entirely in R registers. Maybe later.
3303 PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
3304 DAG.getConstant(ArgOffset, PtrVT));
3305 SDValue Store = DAG.getStore(Chain, dl, Arg, PtrOff,
3306 MachinePointerInfo(), false, false, 0);
3307 MemOpChains.push_back(Store);
3308 if (VR_idx != NumVRs) {
3309 SDValue Load = DAG.getLoad(MVT::v4f32, dl, Store, PtrOff,
3310 MachinePointerInfo(),
3312 MemOpChains.push_back(Load.getValue(1));
3313 RegsToPass.push_back(std::make_pair(VR[VR_idx++], Load));
3316 for (unsigned i=0; i<16; i+=PtrByteSize) {
3317 if (GPR_idx == NumGPRs)
3319 SDValue Ix = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff,
3320 DAG.getConstant(i, PtrVT));
3321 SDValue Load = DAG.getLoad(PtrVT, dl, Store, Ix, MachinePointerInfo(),
3323 MemOpChains.push_back(Load.getValue(1));
3324 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
3329 // Non-varargs Altivec params generally go in registers, but have
3330 // stack space allocated at the end.
3331 if (VR_idx != NumVRs) {
3332 // Doesn't have GPR space allocated.
3333 RegsToPass.push_back(std::make_pair(VR[VR_idx++], Arg));
3334 } else if (nAltivecParamsAtEnd==0) {
3335 // We are emitting Altivec params in order.
3336 LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
3337 isPPC64, isTailCall, true, MemOpChains,
3338 TailCallArguments, dl);
3344 // If all Altivec parameters fit in registers, as they usually do,
3345 // they get stack space following the non-Altivec parameters. We
3346 // don't track this here because nobody below needs it.
3347 // If there are more Altivec parameters than fit in registers emit
3349 if (!isVarArg && nAltivecParamsAtEnd > NumVRs) {
3351 // Offset is aligned; skip 1st 12 params which go in V registers.
3352 ArgOffset = ((ArgOffset+15)/16)*16;
3354 for (unsigned i = 0; i != NumOps; ++i) {
3355 SDValue Arg = OutVals[i];
3356 EVT ArgType = Outs[i].VT;
3357 if (ArgType==MVT::v4f32 || ArgType==MVT::v4i32 ||
3358 ArgType==MVT::v8i16 || ArgType==MVT::v16i8) {
3361 // We are emitting Altivec params in order.
3362 LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
3363 isPPC64, isTailCall, true, MemOpChains,
3364 TailCallArguments, dl);
3371 if (!MemOpChains.empty())
3372 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3373 &MemOpChains[0], MemOpChains.size());
3375 // Check if this is an indirect call (MTCTR/BCTRL).
3376 // See PrepareCall() for more information about calls through function
3377 // pointers in the 64-bit SVR4 ABI.
3378 if (!isTailCall && isPPC64 && PPCSubTarget.isSVR4ABI() &&
3379 !dyn_cast<GlobalAddressSDNode>(Callee) &&
3380 !dyn_cast<ExternalSymbolSDNode>(Callee) &&
3381 !isBLACompatibleAddress(Callee, DAG)) {
3382 // Load r2 into a virtual register and store it to the TOC save area.
3383 SDValue Val = DAG.getCopyFromReg(Chain, dl, PPC::X2, MVT::i64);
3384 // TOC save area offset.
3385 SDValue PtrOff = DAG.getIntPtrConstant(40);
3386 SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
3387 Chain = DAG.getStore(Val.getValue(1), dl, Val, AddPtr, MachinePointerInfo(),
3391 // On Darwin, R12 must contain the address of an indirect callee. This does
3392 // not mean the MTCTR instruction must use R12; it's easier to model this as
3393 // an extra parameter, so do that.
3395 !dyn_cast<GlobalAddressSDNode>(Callee) &&
3396 !dyn_cast<ExternalSymbolSDNode>(Callee) &&
3397 !isBLACompatibleAddress(Callee, DAG))
3398 RegsToPass.push_back(std::make_pair((unsigned)(isPPC64 ? PPC::X12 :
3399 PPC::R12), Callee));
3401 // Build a sequence of copy-to-reg nodes chained together with token chain
3402 // and flag operands which copy the outgoing args into the appropriate regs.
3404 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
3405 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
3406 RegsToPass[i].second, InFlag);
3407 InFlag = Chain.getValue(1);
3411 PrepareTailCall(DAG, InFlag, Chain, dl, isPPC64, SPDiff, NumBytes, LROp,
3412 FPOp, true, TailCallArguments);
3414 return FinishCall(CallConv, dl, isTailCall, isVarArg, DAG,
3415 RegsToPass, InFlag, Chain, Callee, SPDiff, NumBytes,
3420 PPCTargetLowering::LowerReturn(SDValue Chain,
3421 CallingConv::ID CallConv, bool isVarArg,
3422 const SmallVectorImpl<ISD::OutputArg> &Outs,
3423 const SmallVectorImpl<SDValue> &OutVals,
3424 DebugLoc dl, SelectionDAG &DAG) const {
3426 SmallVector<CCValAssign, 16> RVLocs;
3427 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
3428 getTargetMachine(), RVLocs, *DAG.getContext());
3429 CCInfo.AnalyzeReturn(Outs, RetCC_PPC);
3431 // If this is the first return lowered for this function, add the regs to the
3432 // liveout set for the function.
3433 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
3434 for (unsigned i = 0; i != RVLocs.size(); ++i)
3435 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
3440 // Copy the result values into the output registers.
3441 for (unsigned i = 0; i != RVLocs.size(); ++i) {
3442 CCValAssign &VA = RVLocs[i];
3443 assert(VA.isRegLoc() && "Can only return in registers!");
3444 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
3446 Flag = Chain.getValue(1);
3450 return DAG.getNode(PPCISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
3452 return DAG.getNode(PPCISD::RET_FLAG, dl, MVT::Other, Chain);
3455 SDValue PPCTargetLowering::LowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG,
3456 const PPCSubtarget &Subtarget) const {
3457 // When we pop the dynamic allocation we need to restore the SP link.
3458 DebugLoc dl = Op.getDebugLoc();
3460 // Get the corect type for pointers.
3461 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3463 // Construct the stack pointer operand.
3464 bool isPPC64 = Subtarget.isPPC64();
3465 unsigned SP = isPPC64 ? PPC::X1 : PPC::R1;
3466 SDValue StackPtr = DAG.getRegister(SP, PtrVT);
3468 // Get the operands for the STACKRESTORE.
3469 SDValue Chain = Op.getOperand(0);
3470 SDValue SaveSP = Op.getOperand(1);
3472 // Load the old link SP.
3473 SDValue LoadLinkSP = DAG.getLoad(PtrVT, dl, Chain, StackPtr,
3474 MachinePointerInfo(),
3477 // Restore the stack pointer.
3478 Chain = DAG.getCopyToReg(LoadLinkSP.getValue(1), dl, SP, SaveSP);
3480 // Store the old link SP.
3481 return DAG.getStore(Chain, dl, LoadLinkSP, StackPtr, MachinePointerInfo(),
3488 PPCTargetLowering::getReturnAddrFrameIndex(SelectionDAG & DAG) const {
3489 MachineFunction &MF = DAG.getMachineFunction();
3490 bool isPPC64 = PPCSubTarget.isPPC64();
3491 bool isDarwinABI = PPCSubTarget.isDarwinABI();
3492 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3494 // Get current frame pointer save index. The users of this index will be
3495 // primarily DYNALLOC instructions.
3496 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
3497 int RASI = FI->getReturnAddrSaveIndex();
3499 // If the frame pointer save index hasn't been defined yet.
3501 // Find out what the fix offset of the frame pointer save area.
3502 int LROffset = PPCFrameLowering::getReturnSaveOffset(isPPC64, isDarwinABI);
3503 // Allocate the frame index for frame pointer save area.
3504 RASI = MF.getFrameInfo()->CreateFixedObject(isPPC64? 8 : 4, LROffset, true);
3506 FI->setReturnAddrSaveIndex(RASI);
3508 return DAG.getFrameIndex(RASI, PtrVT);
3512 PPCTargetLowering::getFramePointerFrameIndex(SelectionDAG & DAG) const {
3513 MachineFunction &MF = DAG.getMachineFunction();
3514 bool isPPC64 = PPCSubTarget.isPPC64();
3515 bool isDarwinABI = PPCSubTarget.isDarwinABI();
3516 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3518 // Get current frame pointer save index. The users of this index will be
3519 // primarily DYNALLOC instructions.
3520 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
3521 int FPSI = FI->getFramePointerSaveIndex();
3523 // If the frame pointer save index hasn't been defined yet.
3525 // Find out what the fix offset of the frame pointer save area.
3526 int FPOffset = PPCFrameLowering::getFramePointerSaveOffset(isPPC64,
3529 // Allocate the frame index for frame pointer save area.
3530 FPSI = MF.getFrameInfo()->CreateFixedObject(isPPC64? 8 : 4, FPOffset, true);
3532 FI->setFramePointerSaveIndex(FPSI);
3534 return DAG.getFrameIndex(FPSI, PtrVT);
3537 SDValue PPCTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
3539 const PPCSubtarget &Subtarget) const {
3541 SDValue Chain = Op.getOperand(0);
3542 SDValue Size = Op.getOperand(1);
3543 DebugLoc dl = Op.getDebugLoc();
3545 // Get the corect type for pointers.
3546 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3548 SDValue NegSize = DAG.getNode(ISD::SUB, dl, PtrVT,
3549 DAG.getConstant(0, PtrVT), Size);
3550 // Construct a node for the frame pointer save index.
3551 SDValue FPSIdx = getFramePointerFrameIndex(DAG);
3552 // Build a DYNALLOC node.
3553 SDValue Ops[3] = { Chain, NegSize, FPSIdx };
3554 SDVTList VTs = DAG.getVTList(PtrVT, MVT::Other);
3555 return DAG.getNode(PPCISD::DYNALLOC, dl, VTs, Ops, 3);
3558 /// LowerSELECT_CC - Lower floating point select_cc's into fsel instruction when
3560 SDValue PPCTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
3561 // Not FP? Not a fsel.
3562 if (!Op.getOperand(0).getValueType().isFloatingPoint() ||
3563 !Op.getOperand(2).getValueType().isFloatingPoint())
3566 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
3568 // Cannot handle SETEQ/SETNE.
3569 if (CC == ISD::SETEQ || CC == ISD::SETNE) return Op;
3571 EVT ResVT = Op.getValueType();
3572 EVT CmpVT = Op.getOperand(0).getValueType();
3573 SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
3574 SDValue TV = Op.getOperand(2), FV = Op.getOperand(3);
3575 DebugLoc dl = Op.getDebugLoc();
3577 // If the RHS of the comparison is a 0.0, we don't need to do the
3578 // subtraction at all.
3579 if (isFloatingPointZero(RHS))
3581 default: break; // SETUO etc aren't handled by fsel.
3584 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
3587 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
3588 LHS = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, LHS);
3589 return DAG.getNode(PPCISD::FSEL, dl, ResVT, LHS, TV, FV);
3592 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
3595 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
3596 LHS = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, LHS);
3597 return DAG.getNode(PPCISD::FSEL, dl, ResVT,
3598 DAG.getNode(ISD::FNEG, dl, MVT::f64, LHS), TV, FV);
3603 default: break; // SETUO etc aren't handled by fsel.
3606 Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, LHS, RHS);
3607 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
3608 Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
3609 return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, FV, TV);
3612 Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, LHS, RHS);
3613 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
3614 Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
3615 return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, TV, FV);
3618 Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, RHS, LHS);
3619 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
3620 Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
3621 return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, FV, TV);
3624 Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, RHS, LHS);
3625 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
3626 Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
3627 return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, TV, FV);
3632 // FIXME: Split this code up when LegalizeDAGTypes lands.
3633 SDValue PPCTargetLowering::LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG,
3634 DebugLoc dl) const {
3635 assert(Op.getOperand(0).getValueType().isFloatingPoint());
3636 SDValue Src = Op.getOperand(0);
3637 if (Src.getValueType() == MVT::f32)
3638 Src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Src);
3641 switch (Op.getValueType().getSimpleVT().SimpleTy) {
3642 default: llvm_unreachable("Unhandled FP_TO_INT type in custom expander!");
3644 Tmp = DAG.getNode(Op.getOpcode()==ISD::FP_TO_SINT ? PPCISD::FCTIWZ :
3649 Tmp = DAG.getNode(PPCISD::FCTIDZ, dl, MVT::f64, Src);
3653 // Convert the FP value to an int value through memory.
3654 SDValue FIPtr = DAG.CreateStackTemporary(MVT::f64);
3656 // Emit a store to the stack slot.
3657 SDValue Chain = DAG.getStore(DAG.getEntryNode(), dl, Tmp, FIPtr,
3658 MachinePointerInfo(), false, false, 0);
3660 // Result is a load from the stack slot. If loading 4 bytes, make sure to
3662 if (Op.getValueType() == MVT::i32)
3663 FIPtr = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr,
3664 DAG.getConstant(4, FIPtr.getValueType()));
3665 return DAG.getLoad(Op.getValueType(), dl, Chain, FIPtr, MachinePointerInfo(),
3669 SDValue PPCTargetLowering::LowerSINT_TO_FP(SDValue Op,
3670 SelectionDAG &DAG) const {
3671 DebugLoc dl = Op.getDebugLoc();
3672 // Don't handle ppc_fp128 here; let it be lowered to a libcall.
3673 if (Op.getValueType() != MVT::f32 && Op.getValueType() != MVT::f64)
3676 if (Op.getOperand(0).getValueType() == MVT::i64) {
3677 SDValue Bits = DAG.getNode(ISD::BITCAST, dl, MVT::f64, Op.getOperand(0));
3678 SDValue FP = DAG.getNode(PPCISD::FCFID, dl, MVT::f64, Bits);
3679 if (Op.getValueType() == MVT::f32)
3680 FP = DAG.getNode(ISD::FP_ROUND, dl,
3681 MVT::f32, FP, DAG.getIntPtrConstant(0));
3685 assert(Op.getOperand(0).getValueType() == MVT::i32 &&
3686 "Unhandled SINT_TO_FP type in custom expander!");
3687 // Since we only generate this in 64-bit mode, we can take advantage of
3688 // 64-bit registers. In particular, sign extend the input value into the
3689 // 64-bit register with extsw, store the WHOLE 64-bit value into the stack
3690 // then lfd it and fcfid it.
3691 MachineFunction &MF = DAG.getMachineFunction();
3692 MachineFrameInfo *FrameInfo = MF.getFrameInfo();
3693 int FrameIdx = FrameInfo->CreateStackObject(8, 8, false);
3694 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3695 SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
3697 SDValue Ext64 = DAG.getNode(PPCISD::EXTSW_32, dl, MVT::i32,
3700 // STD the extended value into the stack slot.
3701 MachineMemOperand *MMO =
3702 MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FrameIdx),
3703 MachineMemOperand::MOStore, 8, 8);
3704 SDValue Ops[] = { DAG.getEntryNode(), Ext64, FIdx };
3706 DAG.getMemIntrinsicNode(PPCISD::STD_32, dl, DAG.getVTList(MVT::Other),
3707 Ops, 4, MVT::i64, MMO);
3708 // Load the value as a double.
3709 SDValue Ld = DAG.getLoad(MVT::f64, dl, Store, FIdx, MachinePointerInfo(),
3712 // FCFID it and return it.
3713 SDValue FP = DAG.getNode(PPCISD::FCFID, dl, MVT::f64, Ld);
3714 if (Op.getValueType() == MVT::f32)
3715 FP = DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, FP, DAG.getIntPtrConstant(0));
3719 SDValue PPCTargetLowering::LowerFLT_ROUNDS_(SDValue Op,
3720 SelectionDAG &DAG) const {
3721 DebugLoc dl = Op.getDebugLoc();
3723 The rounding mode is in bits 30:31 of FPSR, and has the following
3730 FLT_ROUNDS, on the other hand, expects the following:
3737 To perform the conversion, we do:
3738 ((FPSCR & 0x3) ^ ((~FPSCR & 0x3) >> 1))
3741 MachineFunction &MF = DAG.getMachineFunction();
3742 EVT VT = Op.getValueType();
3743 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3744 std::vector<EVT> NodeTys;
3745 SDValue MFFSreg, InFlag;
3747 // Save FP Control Word to register
3748 NodeTys.push_back(MVT::f64); // return register
3749 NodeTys.push_back(MVT::Glue); // unused in this context
3750 SDValue Chain = DAG.getNode(PPCISD::MFFS, dl, NodeTys, &InFlag, 0);
3752 // Save FP register to stack slot
3753 int SSFI = MF.getFrameInfo()->CreateStackObject(8, 8, false);
3754 SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
3755 SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Chain,
3756 StackSlot, MachinePointerInfo(), false, false,0);
3758 // Load FP Control Word from low 32 bits of stack slot.
3759 SDValue Four = DAG.getConstant(4, PtrVT);
3760 SDValue Addr = DAG.getNode(ISD::ADD, dl, PtrVT, StackSlot, Four);
3761 SDValue CWD = DAG.getLoad(MVT::i32, dl, Store, Addr, MachinePointerInfo(),
3764 // Transform as necessary
3766 DAG.getNode(ISD::AND, dl, MVT::i32,
3767 CWD, DAG.getConstant(3, MVT::i32));
3769 DAG.getNode(ISD::SRL, dl, MVT::i32,
3770 DAG.getNode(ISD::AND, dl, MVT::i32,
3771 DAG.getNode(ISD::XOR, dl, MVT::i32,
3772 CWD, DAG.getConstant(3, MVT::i32)),
3773 DAG.getConstant(3, MVT::i32)),
3774 DAG.getConstant(1, MVT::i32));
3777 DAG.getNode(ISD::XOR, dl, MVT::i32, CWD1, CWD2);
3779 return DAG.getNode((VT.getSizeInBits() < 16 ?
3780 ISD::TRUNCATE : ISD::ZERO_EXTEND), dl, VT, RetVal);
3783 SDValue PPCTargetLowering::LowerSHL_PARTS(SDValue Op, SelectionDAG &DAG) const {
3784 EVT VT = Op.getValueType();
3785 unsigned BitWidth = VT.getSizeInBits();
3786 DebugLoc dl = Op.getDebugLoc();
3787 assert(Op.getNumOperands() == 3 &&
3788 VT == Op.getOperand(1).getValueType() &&
3791 // Expand into a bunch of logical ops. Note that these ops
3792 // depend on the PPC behavior for oversized shift amounts.
3793 SDValue Lo = Op.getOperand(0);
3794 SDValue Hi = Op.getOperand(1);
3795 SDValue Amt = Op.getOperand(2);
3796 EVT AmtVT = Amt.getValueType();
3798 SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
3799 DAG.getConstant(BitWidth, AmtVT), Amt);
3800 SDValue Tmp2 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Amt);
3801 SDValue Tmp3 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Tmp1);
3802 SDValue Tmp4 = DAG.getNode(ISD::OR , dl, VT, Tmp2, Tmp3);
3803 SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
3804 DAG.getConstant(-BitWidth, AmtVT));
3805 SDValue Tmp6 = DAG.getNode(PPCISD::SHL, dl, VT, Lo, Tmp5);
3806 SDValue OutHi = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp6);
3807 SDValue OutLo = DAG.getNode(PPCISD::SHL, dl, VT, Lo, Amt);
3808 SDValue OutOps[] = { OutLo, OutHi };
3809 return DAG.getMergeValues(OutOps, 2, dl);
3812 SDValue PPCTargetLowering::LowerSRL_PARTS(SDValue Op, SelectionDAG &DAG) const {
3813 EVT VT = Op.getValueType();
3814 DebugLoc dl = Op.getDebugLoc();
3815 unsigned BitWidth = VT.getSizeInBits();
3816 assert(Op.getNumOperands() == 3 &&
3817 VT == Op.getOperand(1).getValueType() &&
3820 // Expand into a bunch of logical ops. Note that these ops
3821 // depend on the PPC behavior for oversized shift amounts.
3822 SDValue Lo = Op.getOperand(0);
3823 SDValue Hi = Op.getOperand(1);
3824 SDValue Amt = Op.getOperand(2);
3825 EVT AmtVT = Amt.getValueType();
3827 SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
3828 DAG.getConstant(BitWidth, AmtVT), Amt);
3829 SDValue Tmp2 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Amt);
3830 SDValue Tmp3 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Tmp1);
3831 SDValue Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp3);
3832 SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
3833 DAG.getConstant(-BitWidth, AmtVT));
3834 SDValue Tmp6 = DAG.getNode(PPCISD::SRL, dl, VT, Hi, Tmp5);
3835 SDValue OutLo = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp6);
3836 SDValue OutHi = DAG.getNode(PPCISD::SRL, dl, VT, Hi, Amt);
3837 SDValue OutOps[] = { OutLo, OutHi };
3838 return DAG.getMergeValues(OutOps, 2, dl);
3841 SDValue PPCTargetLowering::LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG) const {
3842 DebugLoc dl = Op.getDebugLoc();
3843 EVT VT = Op.getValueType();
3844 unsigned BitWidth = VT.getSizeInBits();
3845 assert(Op.getNumOperands() == 3 &&
3846 VT == Op.getOperand(1).getValueType() &&
3849 // Expand into a bunch of logical ops, followed by a select_cc.
3850 SDValue Lo = Op.getOperand(0);
3851 SDValue Hi = Op.getOperand(1);
3852 SDValue Amt = Op.getOperand(2);
3853 EVT AmtVT = Amt.getValueType();
3855 SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
3856 DAG.getConstant(BitWidth, AmtVT), Amt);
3857 SDValue Tmp2 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Amt);
3858 SDValue Tmp3 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Tmp1);
3859 SDValue Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp3);
3860 SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
3861 DAG.getConstant(-BitWidth, AmtVT));
3862 SDValue Tmp6 = DAG.getNode(PPCISD::SRA, dl, VT, Hi, Tmp5);
3863 SDValue OutHi = DAG.getNode(PPCISD::SRA, dl, VT, Hi, Amt);
3864 SDValue OutLo = DAG.getSelectCC(dl, Tmp5, DAG.getConstant(0, AmtVT),
3865 Tmp4, Tmp6, ISD::SETLE);
3866 SDValue OutOps[] = { OutLo, OutHi };
3867 return DAG.getMergeValues(OutOps, 2, dl);
3870 //===----------------------------------------------------------------------===//
3871 // Vector related lowering.
3874 /// BuildSplatI - Build a canonical splati of Val with an element size of
3875 /// SplatSize. Cast the result to VT.
3876 static SDValue BuildSplatI(int Val, unsigned SplatSize, EVT VT,
3877 SelectionDAG &DAG, DebugLoc dl) {
3878 assert(Val >= -16 && Val <= 15 && "vsplti is out of range!");
3880 static const EVT VTys[] = { // canonical VT to use for each size.
3881 MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
3884 EVT ReqVT = VT != MVT::Other ? VT : VTys[SplatSize-1];
3886 // Force vspltis[hw] -1 to vspltisb -1 to canonicalize.
3890 EVT CanonicalVT = VTys[SplatSize-1];
3892 // Build a canonical splat for this value.
3893 SDValue Elt = DAG.getConstant(Val, MVT::i32);
3894 SmallVector<SDValue, 8> Ops;
3895 Ops.assign(CanonicalVT.getVectorNumElements(), Elt);
3896 SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, dl, CanonicalVT,
3897 &Ops[0], Ops.size());
3898 return DAG.getNode(ISD::BITCAST, dl, ReqVT, Res);
3901 /// BuildIntrinsicOp - Return a binary operator intrinsic node with the
3902 /// specified intrinsic ID.
3903 static SDValue BuildIntrinsicOp(unsigned IID, SDValue LHS, SDValue RHS,
3904 SelectionDAG &DAG, DebugLoc dl,
3905 EVT DestVT = MVT::Other) {
3906 if (DestVT == MVT::Other) DestVT = LHS.getValueType();
3907 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT,
3908 DAG.getConstant(IID, MVT::i32), LHS, RHS);
3911 /// BuildIntrinsicOp - Return a ternary operator intrinsic node with the
3912 /// specified intrinsic ID.
3913 static SDValue BuildIntrinsicOp(unsigned IID, SDValue Op0, SDValue Op1,
3914 SDValue Op2, SelectionDAG &DAG,
3915 DebugLoc dl, EVT DestVT = MVT::Other) {
3916 if (DestVT == MVT::Other) DestVT = Op0.getValueType();
3917 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT,
3918 DAG.getConstant(IID, MVT::i32), Op0, Op1, Op2);
3922 /// BuildVSLDOI - Return a VECTOR_SHUFFLE that is a vsldoi of the specified
3923 /// amount. The result has the specified value type.
3924 static SDValue BuildVSLDOI(SDValue LHS, SDValue RHS, unsigned Amt,
3925 EVT VT, SelectionDAG &DAG, DebugLoc dl) {
3926 // Force LHS/RHS to be the right type.
3927 LHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, LHS);
3928 RHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, RHS);
3931 for (unsigned i = 0; i != 16; ++i)
3933 SDValue T = DAG.getVectorShuffle(MVT::v16i8, dl, LHS, RHS, Ops);
3934 return DAG.getNode(ISD::BITCAST, dl, VT, T);
3937 // If this is a case we can't handle, return null and let the default
3938 // expansion code take care of it. If we CAN select this case, and if it
3939 // selects to a single instruction, return Op. Otherwise, if we can codegen
3940 // this case more efficiently than a constant pool load, lower it to the
3941 // sequence of ops that should be used.
3942 SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op,
3943 SelectionDAG &DAG) const {
3944 DebugLoc dl = Op.getDebugLoc();
3945 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
3946 assert(BVN != 0 && "Expected a BuildVectorSDNode in LowerBUILD_VECTOR");
3948 // Check if this is a splat of a constant value.
3949 APInt APSplatBits, APSplatUndef;
3950 unsigned SplatBitSize;
3952 if (! BVN->isConstantSplat(APSplatBits, APSplatUndef, SplatBitSize,
3953 HasAnyUndefs, 0, true) || SplatBitSize > 32)
3956 unsigned SplatBits = APSplatBits.getZExtValue();
3957 unsigned SplatUndef = APSplatUndef.getZExtValue();
3958 unsigned SplatSize = SplatBitSize / 8;
3960 // First, handle single instruction cases.
3963 if (SplatBits == 0) {
3964 // Canonicalize all zero vectors to be v4i32.
3965 if (Op.getValueType() != MVT::v4i32 || HasAnyUndefs) {
3966 SDValue Z = DAG.getConstant(0, MVT::i32);
3967 Z = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Z, Z, Z, Z);
3968 Op = DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Z);
3973 // If the sign extended value is in the range [-16,15], use VSPLTI[bhw].
3974 int32_t SextVal= (int32_t(SplatBits << (32-SplatBitSize)) >>
3976 if (SextVal >= -16 && SextVal <= 15)
3977 return BuildSplatI(SextVal, SplatSize, Op.getValueType(), DAG, dl);
3980 // Two instruction sequences.
3982 // If this value is in the range [-32,30] and is even, use:
3983 // tmp = VSPLTI[bhw], result = add tmp, tmp
3984 if (SextVal >= -32 && SextVal <= 30 && (SextVal & 1) == 0) {
3985 SDValue Res = BuildSplatI(SextVal >> 1, SplatSize, MVT::Other, DAG, dl);
3986 Res = DAG.getNode(ISD::ADD, dl, Res.getValueType(), Res, Res);
3987 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
3990 // If this is 0x8000_0000 x 4, turn into vspltisw + vslw. If it is
3991 // 0x7FFF_FFFF x 4, turn it into not(0x8000_0000). This is important
3993 if (SplatSize == 4 && SplatBits == (0x7FFFFFFF&~SplatUndef)) {
3994 // Make -1 and vspltisw -1:
3995 SDValue OnesV = BuildSplatI(-1, 4, MVT::v4i32, DAG, dl);
3997 // Make the VSLW intrinsic, computing 0x8000_0000.
3998 SDValue Res = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, OnesV,
4001 // xor by OnesV to invert it.
4002 Res = DAG.getNode(ISD::XOR, dl, MVT::v4i32, Res, OnesV);
4003 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
4006 // Check to see if this is a wide variety of vsplti*, binop self cases.
4007 static const signed char SplatCsts[] = {
4008 -1, 1, -2, 2, -3, 3, -4, 4, -5, 5, -6, 6, -7, 7,
4009 -8, 8, -9, 9, -10, 10, -11, 11, -12, 12, -13, 13, 14, -14, 15, -15, -16
4012 for (unsigned idx = 0; idx < array_lengthof(SplatCsts); ++idx) {
4013 // Indirect through the SplatCsts array so that we favor 'vsplti -1' for
4014 // cases which are ambiguous (e.g. formation of 0x8000_0000). 'vsplti -1'
4015 int i = SplatCsts[idx];
4017 // Figure out what shift amount will be used by altivec if shifted by i in
4019 unsigned TypeShiftAmt = i & (SplatBitSize-1);
4021 // vsplti + shl self.
4022 if (SextVal == (i << (int)TypeShiftAmt)) {
4023 SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
4024 static const unsigned IIDs[] = { // Intrinsic to use for each size.
4025 Intrinsic::ppc_altivec_vslb, Intrinsic::ppc_altivec_vslh, 0,
4026 Intrinsic::ppc_altivec_vslw
4028 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
4029 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
4032 // vsplti + srl self.
4033 if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
4034 SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
4035 static const unsigned IIDs[] = { // Intrinsic to use for each size.
4036 Intrinsic::ppc_altivec_vsrb, Intrinsic::ppc_altivec_vsrh, 0,
4037 Intrinsic::ppc_altivec_vsrw
4039 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
4040 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
4043 // vsplti + sra self.
4044 if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
4045 SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
4046 static const unsigned IIDs[] = { // Intrinsic to use for each size.
4047 Intrinsic::ppc_altivec_vsrab, Intrinsic::ppc_altivec_vsrah, 0,
4048 Intrinsic::ppc_altivec_vsraw
4050 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
4051 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
4054 // vsplti + rol self.
4055 if (SextVal == (int)(((unsigned)i << TypeShiftAmt) |
4056 ((unsigned)i >> (SplatBitSize-TypeShiftAmt)))) {
4057 SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
4058 static const unsigned IIDs[] = { // Intrinsic to use for each size.
4059 Intrinsic::ppc_altivec_vrlb, Intrinsic::ppc_altivec_vrlh, 0,
4060 Intrinsic::ppc_altivec_vrlw
4062 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
4063 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
4066 // t = vsplti c, result = vsldoi t, t, 1
4067 if (SextVal == ((i << 8) | (i < 0 ? 0xFF : 0))) {
4068 SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
4069 return BuildVSLDOI(T, T, 1, Op.getValueType(), DAG, dl);
4071 // t = vsplti c, result = vsldoi t, t, 2
4072 if (SextVal == ((i << 16) | (i < 0 ? 0xFFFF : 0))) {
4073 SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
4074 return BuildVSLDOI(T, T, 2, Op.getValueType(), DAG, dl);
4076 // t = vsplti c, result = vsldoi t, t, 3
4077 if (SextVal == ((i << 24) | (i < 0 ? 0xFFFFFF : 0))) {
4078 SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
4079 return BuildVSLDOI(T, T, 3, Op.getValueType(), DAG, dl);
4083 // Three instruction sequences.
4085 // Odd, in range [17,31]: (vsplti C)-(vsplti -16).
4086 if (SextVal >= 0 && SextVal <= 31) {
4087 SDValue LHS = BuildSplatI(SextVal-16, SplatSize, MVT::Other, DAG, dl);
4088 SDValue RHS = BuildSplatI(-16, SplatSize, MVT::Other, DAG, dl);
4089 LHS = DAG.getNode(ISD::SUB, dl, LHS.getValueType(), LHS, RHS);
4090 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), LHS);
4092 // Odd, in range [-31,-17]: (vsplti C)+(vsplti -16).
4093 if (SextVal >= -31 && SextVal <= 0) {
4094 SDValue LHS = BuildSplatI(SextVal+16, SplatSize, MVT::Other, DAG, dl);
4095 SDValue RHS = BuildSplatI(-16, SplatSize, MVT::Other, DAG, dl);
4096 LHS = DAG.getNode(ISD::ADD, dl, LHS.getValueType(), LHS, RHS);
4097 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), LHS);
4103 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
4104 /// the specified operations to build the shuffle.
4105 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
4106 SDValue RHS, SelectionDAG &DAG,
4108 unsigned OpNum = (PFEntry >> 26) & 0x0F;
4109 unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
4110 unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
4113 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
4125 if (OpNum == OP_COPY) {
4126 if (LHSID == (1*9+2)*9+3) return LHS;
4127 assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
4131 SDValue OpLHS, OpRHS;
4132 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
4133 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
4137 default: llvm_unreachable("Unknown i32 permute!");
4139 ShufIdxs[ 0] = 0; ShufIdxs[ 1] = 1; ShufIdxs[ 2] = 2; ShufIdxs[ 3] = 3;
4140 ShufIdxs[ 4] = 16; ShufIdxs[ 5] = 17; ShufIdxs[ 6] = 18; ShufIdxs[ 7] = 19;
4141 ShufIdxs[ 8] = 4; ShufIdxs[ 9] = 5; ShufIdxs[10] = 6; ShufIdxs[11] = 7;
4142 ShufIdxs[12] = 20; ShufIdxs[13] = 21; ShufIdxs[14] = 22; ShufIdxs[15] = 23;
4145 ShufIdxs[ 0] = 8; ShufIdxs[ 1] = 9; ShufIdxs[ 2] = 10; ShufIdxs[ 3] = 11;
4146 ShufIdxs[ 4] = 24; ShufIdxs[ 5] = 25; ShufIdxs[ 6] = 26; ShufIdxs[ 7] = 27;
4147 ShufIdxs[ 8] = 12; ShufIdxs[ 9] = 13; ShufIdxs[10] = 14; ShufIdxs[11] = 15;
4148 ShufIdxs[12] = 28; ShufIdxs[13] = 29; ShufIdxs[14] = 30; ShufIdxs[15] = 31;
4151 for (unsigned i = 0; i != 16; ++i)
4152 ShufIdxs[i] = (i&3)+0;
4155 for (unsigned i = 0; i != 16; ++i)
4156 ShufIdxs[i] = (i&3)+4;
4159 for (unsigned i = 0; i != 16; ++i)
4160 ShufIdxs[i] = (i&3)+8;
4163 for (unsigned i = 0; i != 16; ++i)
4164 ShufIdxs[i] = (i&3)+12;
4167 return BuildVSLDOI(OpLHS, OpRHS, 4, OpLHS.getValueType(), DAG, dl);
4169 return BuildVSLDOI(OpLHS, OpRHS, 8, OpLHS.getValueType(), DAG, dl);
4171 return BuildVSLDOI(OpLHS, OpRHS, 12, OpLHS.getValueType(), DAG, dl);
4173 EVT VT = OpLHS.getValueType();
4174 OpLHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpLHS);
4175 OpRHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpRHS);
4176 SDValue T = DAG.getVectorShuffle(MVT::v16i8, dl, OpLHS, OpRHS, ShufIdxs);
4177 return DAG.getNode(ISD::BITCAST, dl, VT, T);
4180 /// LowerVECTOR_SHUFFLE - Return the code we lower for VECTOR_SHUFFLE. If this
4181 /// is a shuffle we can handle in a single instruction, return it. Otherwise,
4182 /// return the code it can be lowered into. Worst case, it can always be
4183 /// lowered into a vperm.
4184 SDValue PPCTargetLowering::LowerVECTOR_SHUFFLE(SDValue Op,
4185 SelectionDAG &DAG) const {
4186 DebugLoc dl = Op.getDebugLoc();
4187 SDValue V1 = Op.getOperand(0);
4188 SDValue V2 = Op.getOperand(1);
4189 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
4190 EVT VT = Op.getValueType();
4192 // Cases that are handled by instructions that take permute immediates
4193 // (such as vsplt*) should be left as VECTOR_SHUFFLE nodes so they can be
4194 // selected by the instruction selector.
4195 if (V2.getOpcode() == ISD::UNDEF) {
4196 if (PPC::isSplatShuffleMask(SVOp, 1) ||
4197 PPC::isSplatShuffleMask(SVOp, 2) ||
4198 PPC::isSplatShuffleMask(SVOp, 4) ||
4199 PPC::isVPKUWUMShuffleMask(SVOp, true) ||
4200 PPC::isVPKUHUMShuffleMask(SVOp, true) ||
4201 PPC::isVSLDOIShuffleMask(SVOp, true) != -1 ||
4202 PPC::isVMRGLShuffleMask(SVOp, 1, true) ||
4203 PPC::isVMRGLShuffleMask(SVOp, 2, true) ||
4204 PPC::isVMRGLShuffleMask(SVOp, 4, true) ||
4205 PPC::isVMRGHShuffleMask(SVOp, 1, true) ||
4206 PPC::isVMRGHShuffleMask(SVOp, 2, true) ||
4207 PPC::isVMRGHShuffleMask(SVOp, 4, true)) {
4212 // Altivec has a variety of "shuffle immediates" that take two vector inputs
4213 // and produce a fixed permutation. If any of these match, do not lower to
4215 if (PPC::isVPKUWUMShuffleMask(SVOp, false) ||
4216 PPC::isVPKUHUMShuffleMask(SVOp, false) ||
4217 PPC::isVSLDOIShuffleMask(SVOp, false) != -1 ||
4218 PPC::isVMRGLShuffleMask(SVOp, 1, false) ||
4219 PPC::isVMRGLShuffleMask(SVOp, 2, false) ||
4220 PPC::isVMRGLShuffleMask(SVOp, 4, false) ||
4221 PPC::isVMRGHShuffleMask(SVOp, 1, false) ||
4222 PPC::isVMRGHShuffleMask(SVOp, 2, false) ||
4223 PPC::isVMRGHShuffleMask(SVOp, 4, false))
4226 // Check to see if this is a shuffle of 4-byte values. If so, we can use our
4227 // perfect shuffle table to emit an optimal matching sequence.
4228 SmallVector<int, 16> PermMask;
4229 SVOp->getMask(PermMask);
4231 unsigned PFIndexes[4];
4232 bool isFourElementShuffle = true;
4233 for (unsigned i = 0; i != 4 && isFourElementShuffle; ++i) { // Element number
4234 unsigned EltNo = 8; // Start out undef.
4235 for (unsigned j = 0; j != 4; ++j) { // Intra-element byte.
4236 if (PermMask[i*4+j] < 0)
4237 continue; // Undef, ignore it.
4239 unsigned ByteSource = PermMask[i*4+j];
4240 if ((ByteSource & 3) != j) {
4241 isFourElementShuffle = false;
4246 EltNo = ByteSource/4;
4247 } else if (EltNo != ByteSource/4) {
4248 isFourElementShuffle = false;
4252 PFIndexes[i] = EltNo;
4255 // If this shuffle can be expressed as a shuffle of 4-byte elements, use the
4256 // perfect shuffle vector to determine if it is cost effective to do this as
4257 // discrete instructions, or whether we should use a vperm.
4258 if (isFourElementShuffle) {
4259 // Compute the index in the perfect shuffle table.
4260 unsigned PFTableIndex =
4261 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
4263 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
4264 unsigned Cost = (PFEntry >> 30);
4266 // Determining when to avoid vperm is tricky. Many things affect the cost
4267 // of vperm, particularly how many times the perm mask needs to be computed.
4268 // For example, if the perm mask can be hoisted out of a loop or is already
4269 // used (perhaps because there are multiple permutes with the same shuffle
4270 // mask?) the vperm has a cost of 1. OTOH, hoisting the permute mask out of
4271 // the loop requires an extra register.
4273 // As a compromise, we only emit discrete instructions if the shuffle can be
4274 // generated in 3 or fewer operations. When we have loop information
4275 // available, if this block is within a loop, we should avoid using vperm
4276 // for 3-operation perms and use a constant pool load instead.
4278 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
4281 // Lower this to a VPERM(V1, V2, V3) expression, where V3 is a constant
4282 // vector that will get spilled to the constant pool.
4283 if (V2.getOpcode() == ISD::UNDEF) V2 = V1;
4285 // The SHUFFLE_VECTOR mask is almost exactly what we want for vperm, except
4286 // that it is in input element units, not in bytes. Convert now.
4287 EVT EltVT = V1.getValueType().getVectorElementType();
4288 unsigned BytesPerElement = EltVT.getSizeInBits()/8;
4290 SmallVector<SDValue, 16> ResultMask;
4291 for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i) {
4292 unsigned SrcElt = PermMask[i] < 0 ? 0 : PermMask[i];
4294 for (unsigned j = 0; j != BytesPerElement; ++j)
4295 ResultMask.push_back(DAG.getConstant(SrcElt*BytesPerElement+j,
4299 SDValue VPermMask = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v16i8,
4300 &ResultMask[0], ResultMask.size());
4301 return DAG.getNode(PPCISD::VPERM, dl, V1.getValueType(), V1, V2, VPermMask);
4304 /// getAltivecCompareInfo - Given an intrinsic, return false if it is not an
4305 /// altivec comparison. If it is, return true and fill in Opc/isDot with
4306 /// information about the intrinsic.
4307 static bool getAltivecCompareInfo(SDValue Intrin, int &CompareOpc,
4309 unsigned IntrinsicID =
4310 cast<ConstantSDNode>(Intrin.getOperand(0))->getZExtValue();
4313 switch (IntrinsicID) {
4314 default: return false;
4315 // Comparison predicates.
4316 case Intrinsic::ppc_altivec_vcmpbfp_p: CompareOpc = 966; isDot = 1; break;
4317 case Intrinsic::ppc_altivec_vcmpeqfp_p: CompareOpc = 198; isDot = 1; break;
4318 case Intrinsic::ppc_altivec_vcmpequb_p: CompareOpc = 6; isDot = 1; break;
4319 case Intrinsic::ppc_altivec_vcmpequh_p: CompareOpc = 70; isDot = 1; break;
4320 case Intrinsic::ppc_altivec_vcmpequw_p: CompareOpc = 134; isDot = 1; break;
4321 case Intrinsic::ppc_altivec_vcmpgefp_p: CompareOpc = 454; isDot = 1; break;
4322 case Intrinsic::ppc_altivec_vcmpgtfp_p: CompareOpc = 710; isDot = 1; break;
4323 case Intrinsic::ppc_altivec_vcmpgtsb_p: CompareOpc = 774; isDot = 1; break;
4324 case Intrinsic::ppc_altivec_vcmpgtsh_p: CompareOpc = 838; isDot = 1; break;
4325 case Intrinsic::ppc_altivec_vcmpgtsw_p: CompareOpc = 902; isDot = 1; break;
4326 case Intrinsic::ppc_altivec_vcmpgtub_p: CompareOpc = 518; isDot = 1; break;
4327 case Intrinsic::ppc_altivec_vcmpgtuh_p: CompareOpc = 582; isDot = 1; break;
4328 case Intrinsic::ppc_altivec_vcmpgtuw_p: CompareOpc = 646; isDot = 1; break;
4330 // Normal Comparisons.
4331 case Intrinsic::ppc_altivec_vcmpbfp: CompareOpc = 966; isDot = 0; break;
4332 case Intrinsic::ppc_altivec_vcmpeqfp: CompareOpc = 198; isDot = 0; break;
4333 case Intrinsic::ppc_altivec_vcmpequb: CompareOpc = 6; isDot = 0; break;
4334 case Intrinsic::ppc_altivec_vcmpequh: CompareOpc = 70; isDot = 0; break;
4335 case Intrinsic::ppc_altivec_vcmpequw: CompareOpc = 134; isDot = 0; break;
4336 case Intrinsic::ppc_altivec_vcmpgefp: CompareOpc = 454; isDot = 0; break;
4337 case Intrinsic::ppc_altivec_vcmpgtfp: CompareOpc = 710; isDot = 0; break;
4338 case Intrinsic::ppc_altivec_vcmpgtsb: CompareOpc = 774; isDot = 0; break;
4339 case Intrinsic::ppc_altivec_vcmpgtsh: CompareOpc = 838; isDot = 0; break;
4340 case Intrinsic::ppc_altivec_vcmpgtsw: CompareOpc = 902; isDot = 0; break;
4341 case Intrinsic::ppc_altivec_vcmpgtub: CompareOpc = 518; isDot = 0; break;
4342 case Intrinsic::ppc_altivec_vcmpgtuh: CompareOpc = 582; isDot = 0; break;
4343 case Intrinsic::ppc_altivec_vcmpgtuw: CompareOpc = 646; isDot = 0; break;
4348 /// LowerINTRINSIC_WO_CHAIN - If this is an intrinsic that we want to custom
4349 /// lower, do it, otherwise return null.
4350 SDValue PPCTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
4351 SelectionDAG &DAG) const {
4352 // If this is a lowered altivec predicate compare, CompareOpc is set to the
4353 // opcode number of the comparison.
4354 DebugLoc dl = Op.getDebugLoc();
4357 if (!getAltivecCompareInfo(Op, CompareOpc, isDot))
4358 return SDValue(); // Don't custom lower most intrinsics.
4360 // If this is a non-dot comparison, make the VCMP node and we are done.
4362 SDValue Tmp = DAG.getNode(PPCISD::VCMP, dl, Op.getOperand(2).getValueType(),
4363 Op.getOperand(1), Op.getOperand(2),
4364 DAG.getConstant(CompareOpc, MVT::i32));
4365 return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Tmp);
4368 // Create the PPCISD altivec 'dot' comparison node.
4370 Op.getOperand(2), // LHS
4371 Op.getOperand(3), // RHS
4372 DAG.getConstant(CompareOpc, MVT::i32)
4374 std::vector<EVT> VTs;
4375 VTs.push_back(Op.getOperand(2).getValueType());
4376 VTs.push_back(MVT::Glue);
4377 SDValue CompNode = DAG.getNode(PPCISD::VCMPo, dl, VTs, Ops, 3);
4379 // Now that we have the comparison, emit a copy from the CR to a GPR.
4380 // This is flagged to the above dot comparison.
4381 SDValue Flags = DAG.getNode(PPCISD::MFCR, dl, MVT::i32,
4382 DAG.getRegister(PPC::CR6, MVT::i32),
4383 CompNode.getValue(1));
4385 // Unpack the result based on how the target uses it.
4386 unsigned BitNo; // Bit # of CR6.
4387 bool InvertBit; // Invert result?
4388 switch (cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue()) {
4389 default: // Can't happen, don't crash on invalid number though.
4390 case 0: // Return the value of the EQ bit of CR6.
4391 BitNo = 0; InvertBit = false;
4393 case 1: // Return the inverted value of the EQ bit of CR6.
4394 BitNo = 0; InvertBit = true;
4396 case 2: // Return the value of the LT bit of CR6.
4397 BitNo = 2; InvertBit = false;
4399 case 3: // Return the inverted value of the LT bit of CR6.
4400 BitNo = 2; InvertBit = true;
4404 // Shift the bit into the low position.
4405 Flags = DAG.getNode(ISD::SRL, dl, MVT::i32, Flags,
4406 DAG.getConstant(8-(3-BitNo), MVT::i32));
4408 Flags = DAG.getNode(ISD::AND, dl, MVT::i32, Flags,
4409 DAG.getConstant(1, MVT::i32));
4411 // If we are supposed to, toggle the bit.
4413 Flags = DAG.getNode(ISD::XOR, dl, MVT::i32, Flags,
4414 DAG.getConstant(1, MVT::i32));
4418 SDValue PPCTargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op,
4419 SelectionDAG &DAG) const {
4420 DebugLoc dl = Op.getDebugLoc();
4421 // Create a stack slot that is 16-byte aligned.
4422 MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
4423 int FrameIdx = FrameInfo->CreateStackObject(16, 16, false);
4424 EVT PtrVT = getPointerTy();
4425 SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
4427 // Store the input value into Value#0 of the stack slot.
4428 SDValue Store = DAG.getStore(DAG.getEntryNode(), dl,
4429 Op.getOperand(0), FIdx, MachinePointerInfo(),
4432 return DAG.getLoad(Op.getValueType(), dl, Store, FIdx, MachinePointerInfo(),
4436 SDValue PPCTargetLowering::LowerMUL(SDValue Op, SelectionDAG &DAG) const {
4437 DebugLoc dl = Op.getDebugLoc();
4438 if (Op.getValueType() == MVT::v4i32) {
4439 SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
4441 SDValue Zero = BuildSplatI( 0, 1, MVT::v4i32, DAG, dl);
4442 SDValue Neg16 = BuildSplatI(-16, 4, MVT::v4i32, DAG, dl);//+16 as shift amt.
4444 SDValue RHSSwap = // = vrlw RHS, 16
4445 BuildIntrinsicOp(Intrinsic::ppc_altivec_vrlw, RHS, Neg16, DAG, dl);
4447 // Shrinkify inputs to v8i16.
4448 LHS = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, LHS);
4449 RHS = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, RHS);
4450 RHSSwap = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, RHSSwap);
4452 // Low parts multiplied together, generating 32-bit results (we ignore the
4454 SDValue LoProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmulouh,
4455 LHS, RHS, DAG, dl, MVT::v4i32);
4457 SDValue HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmsumuhm,
4458 LHS, RHSSwap, Zero, DAG, dl, MVT::v4i32);
4459 // Shift the high parts up 16 bits.
4460 HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, HiProd,
4462 return DAG.getNode(ISD::ADD, dl, MVT::v4i32, LoProd, HiProd);
4463 } else if (Op.getValueType() == MVT::v8i16) {
4464 SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
4466 SDValue Zero = BuildSplatI(0, 1, MVT::v8i16, DAG, dl);
4468 return BuildIntrinsicOp(Intrinsic::ppc_altivec_vmladduhm,
4469 LHS, RHS, Zero, DAG, dl);
4470 } else if (Op.getValueType() == MVT::v16i8) {
4471 SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
4473 // Multiply the even 8-bit parts, producing 16-bit sums.
4474 SDValue EvenParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuleub,
4475 LHS, RHS, DAG, dl, MVT::v8i16);
4476 EvenParts = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, EvenParts);
4478 // Multiply the odd 8-bit parts, producing 16-bit sums.
4479 SDValue OddParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuloub,
4480 LHS, RHS, DAG, dl, MVT::v8i16);
4481 OddParts = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OddParts);
4483 // Merge the results together.
4485 for (unsigned i = 0; i != 8; ++i) {
4487 Ops[i*2+1] = 2*i+1+16;
4489 return DAG.getVectorShuffle(MVT::v16i8, dl, EvenParts, OddParts, Ops);
4491 llvm_unreachable("Unknown mul to lower!");
4495 /// LowerOperation - Provide custom lowering hooks for some operations.
4497 SDValue PPCTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
4498 switch (Op.getOpcode()) {
4499 default: llvm_unreachable("Wasn't expecting to be able to lower this!");
4500 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
4501 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
4502 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
4503 case ISD::GlobalTLSAddress: llvm_unreachable("TLS not implemented for PPC");
4504 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
4505 case ISD::SETCC: return LowerSETCC(Op, DAG);
4506 case ISD::INIT_TRAMPOLINE: return LowerINIT_TRAMPOLINE(Op, DAG);
4507 case ISD::ADJUST_TRAMPOLINE: return LowerADJUST_TRAMPOLINE(Op, DAG);
4509 return LowerVASTART(Op, DAG, PPCSubTarget);
4512 return LowerVAARG(Op, DAG, PPCSubTarget);
4514 case ISD::STACKRESTORE: return LowerSTACKRESTORE(Op, DAG, PPCSubTarget);
4515 case ISD::DYNAMIC_STACKALLOC:
4516 return LowerDYNAMIC_STACKALLOC(Op, DAG, PPCSubTarget);
4518 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
4519 case ISD::FP_TO_UINT:
4520 case ISD::FP_TO_SINT: return LowerFP_TO_INT(Op, DAG,
4522 case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
4523 case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
4525 // Lower 64-bit shifts.
4526 case ISD::SHL_PARTS: return LowerSHL_PARTS(Op, DAG);
4527 case ISD::SRL_PARTS: return LowerSRL_PARTS(Op, DAG);
4528 case ISD::SRA_PARTS: return LowerSRA_PARTS(Op, DAG);
4530 // Vector-related lowering.
4531 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
4532 case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
4533 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
4534 case ISD::SCALAR_TO_VECTOR: return LowerSCALAR_TO_VECTOR(Op, DAG);
4535 case ISD::MUL: return LowerMUL(Op, DAG);
4537 // Frame & Return address.
4538 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
4539 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
4544 void PPCTargetLowering::ReplaceNodeResults(SDNode *N,
4545 SmallVectorImpl<SDValue>&Results,
4546 SelectionDAG &DAG) const {
4547 const TargetMachine &TM = getTargetMachine();
4548 DebugLoc dl = N->getDebugLoc();
4549 switch (N->getOpcode()) {
4551 assert(false && "Do not know how to custom type legalize this operation!");
4554 if (!TM.getSubtarget<PPCSubtarget>().isSVR4ABI()
4555 || TM.getSubtarget<PPCSubtarget>().isPPC64())
4558 EVT VT = N->getValueType(0);
4560 if (VT == MVT::i64) {
4561 SDValue NewNode = LowerVAARG(SDValue(N, 1), DAG, PPCSubTarget);
4563 Results.push_back(NewNode);
4564 Results.push_back(NewNode.getValue(1));
4568 case ISD::FP_ROUND_INREG: {
4569 assert(N->getValueType(0) == MVT::ppcf128);
4570 assert(N->getOperand(0).getValueType() == MVT::ppcf128);
4571 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl,
4572 MVT::f64, N->getOperand(0),
4573 DAG.getIntPtrConstant(0));
4574 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl,
4575 MVT::f64, N->getOperand(0),
4576 DAG.getIntPtrConstant(1));
4578 // This sequence changes FPSCR to do round-to-zero, adds the two halves
4579 // of the long double, and puts FPSCR back the way it was. We do not
4580 // actually model FPSCR.
4581 std::vector<EVT> NodeTys;
4582 SDValue Ops[4], Result, MFFSreg, InFlag, FPreg;
4584 NodeTys.push_back(MVT::f64); // Return register
4585 NodeTys.push_back(MVT::Glue); // Returns a flag for later insns
4586 Result = DAG.getNode(PPCISD::MFFS, dl, NodeTys, &InFlag, 0);
4587 MFFSreg = Result.getValue(0);
4588 InFlag = Result.getValue(1);
4591 NodeTys.push_back(MVT::Glue); // Returns a flag
4592 Ops[0] = DAG.getConstant(31, MVT::i32);
4594 Result = DAG.getNode(PPCISD::MTFSB1, dl, NodeTys, Ops, 2);
4595 InFlag = Result.getValue(0);
4598 NodeTys.push_back(MVT::Glue); // Returns a flag
4599 Ops[0] = DAG.getConstant(30, MVT::i32);
4601 Result = DAG.getNode(PPCISD::MTFSB0, dl, NodeTys, Ops, 2);
4602 InFlag = Result.getValue(0);
4605 NodeTys.push_back(MVT::f64); // result of add
4606 NodeTys.push_back(MVT::Glue); // Returns a flag
4610 Result = DAG.getNode(PPCISD::FADDRTZ, dl, NodeTys, Ops, 3);
4611 FPreg = Result.getValue(0);
4612 InFlag = Result.getValue(1);
4615 NodeTys.push_back(MVT::f64);
4616 Ops[0] = DAG.getConstant(1, MVT::i32);
4620 Result = DAG.getNode(PPCISD::MTFSF, dl, NodeTys, Ops, 4);
4621 FPreg = Result.getValue(0);
4623 // We know the low half is about to be thrown away, so just use something
4625 Results.push_back(DAG.getNode(ISD::BUILD_PAIR, dl, MVT::ppcf128,
4629 case ISD::FP_TO_SINT:
4630 Results.push_back(LowerFP_TO_INT(SDValue(N, 0), DAG, dl));
4636 //===----------------------------------------------------------------------===//
4637 // Other Lowering Code
4638 //===----------------------------------------------------------------------===//
4641 PPCTargetLowering::EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
4642 bool is64bit, unsigned BinOpcode) const {
4643 // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
4644 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
4646 const BasicBlock *LLVM_BB = BB->getBasicBlock();
4647 MachineFunction *F = BB->getParent();
4648 MachineFunction::iterator It = BB;
4651 unsigned dest = MI->getOperand(0).getReg();
4652 unsigned ptrA = MI->getOperand(1).getReg();
4653 unsigned ptrB = MI->getOperand(2).getReg();
4654 unsigned incr = MI->getOperand(3).getReg();
4655 DebugLoc dl = MI->getDebugLoc();
4657 MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB);
4658 MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
4659 F->insert(It, loopMBB);
4660 F->insert(It, exitMBB);
4661 exitMBB->splice(exitMBB->begin(), BB,
4662 llvm::next(MachineBasicBlock::iterator(MI)),
4664 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
4666 MachineRegisterInfo &RegInfo = F->getRegInfo();
4667 unsigned TmpReg = (!BinOpcode) ? incr :
4668 RegInfo.createVirtualRegister(
4669 is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
4670 (const TargetRegisterClass *) &PPC::GPRCRegClass);
4674 // fallthrough --> loopMBB
4675 BB->addSuccessor(loopMBB);
4678 // l[wd]arx dest, ptr
4679 // add r0, dest, incr
4680 // st[wd]cx. r0, ptr
4682 // fallthrough --> exitMBB
4684 BuildMI(BB, dl, TII->get(is64bit ? PPC::LDARX : PPC::LWARX), dest)
4685 .addReg(ptrA).addReg(ptrB);
4687 BuildMI(BB, dl, TII->get(BinOpcode), TmpReg).addReg(incr).addReg(dest);
4688 BuildMI(BB, dl, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
4689 .addReg(TmpReg).addReg(ptrA).addReg(ptrB);
4690 BuildMI(BB, dl, TII->get(PPC::BCC))
4691 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loopMBB);
4692 BB->addSuccessor(loopMBB);
4693 BB->addSuccessor(exitMBB);
4702 PPCTargetLowering::EmitPartwordAtomicBinary(MachineInstr *MI,
4703 MachineBasicBlock *BB,
4704 bool is8bit, // operation
4705 unsigned BinOpcode) const {
4706 // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
4707 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
4708 // In 64 bit mode we have to use 64 bits for addresses, even though the
4709 // lwarx/stwcx are 32 bits. With the 32-bit atomics we can use address
4710 // registers without caring whether they're 32 or 64, but here we're
4711 // doing actual arithmetic on the addresses.
4712 bool is64bit = PPCSubTarget.isPPC64();
4713 unsigned ZeroReg = is64bit ? PPC::X0 : PPC::R0;
4715 const BasicBlock *LLVM_BB = BB->getBasicBlock();
4716 MachineFunction *F = BB->getParent();
4717 MachineFunction::iterator It = BB;
4720 unsigned dest = MI->getOperand(0).getReg();
4721 unsigned ptrA = MI->getOperand(1).getReg();
4722 unsigned ptrB = MI->getOperand(2).getReg();
4723 unsigned incr = MI->getOperand(3).getReg();
4724 DebugLoc dl = MI->getDebugLoc();
4726 MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB);
4727 MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
4728 F->insert(It, loopMBB);
4729 F->insert(It, exitMBB);
4730 exitMBB->splice(exitMBB->begin(), BB,
4731 llvm::next(MachineBasicBlock::iterator(MI)),
4733 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
4735 MachineRegisterInfo &RegInfo = F->getRegInfo();
4736 const TargetRegisterClass *RC =
4737 is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
4738 (const TargetRegisterClass *) &PPC::GPRCRegClass;
4739 unsigned PtrReg = RegInfo.createVirtualRegister(RC);
4740 unsigned Shift1Reg = RegInfo.createVirtualRegister(RC);
4741 unsigned ShiftReg = RegInfo.createVirtualRegister(RC);
4742 unsigned Incr2Reg = RegInfo.createVirtualRegister(RC);
4743 unsigned MaskReg = RegInfo.createVirtualRegister(RC);
4744 unsigned Mask2Reg = RegInfo.createVirtualRegister(RC);
4745 unsigned Mask3Reg = RegInfo.createVirtualRegister(RC);
4746 unsigned Tmp2Reg = RegInfo.createVirtualRegister(RC);
4747 unsigned Tmp3Reg = RegInfo.createVirtualRegister(RC);
4748 unsigned Tmp4Reg = RegInfo.createVirtualRegister(RC);
4749 unsigned TmpDestReg = RegInfo.createVirtualRegister(RC);
4751 unsigned TmpReg = (!BinOpcode) ? Incr2Reg : RegInfo.createVirtualRegister(RC);
4755 // fallthrough --> loopMBB
4756 BB->addSuccessor(loopMBB);
4758 // The 4-byte load must be aligned, while a char or short may be
4759 // anywhere in the word. Hence all this nasty bookkeeping code.
4760 // add ptr1, ptrA, ptrB [copy if ptrA==0]
4761 // rlwinm shift1, ptr1, 3, 27, 28 [3, 27, 27]
4762 // xori shift, shift1, 24 [16]
4763 // rlwinm ptr, ptr1, 0, 0, 29
4764 // slw incr2, incr, shift
4765 // li mask2, 255 [li mask3, 0; ori mask2, mask3, 65535]
4766 // slw mask, mask2, shift
4768 // lwarx tmpDest, ptr
4769 // add tmp, tmpDest, incr2
4770 // andc tmp2, tmpDest, mask
4771 // and tmp3, tmp, mask
4772 // or tmp4, tmp3, tmp2
4775 // fallthrough --> exitMBB
4776 // srw dest, tmpDest, shift
4777 if (ptrA != ZeroReg) {
4778 Ptr1Reg = RegInfo.createVirtualRegister(RC);
4779 BuildMI(BB, dl, TII->get(is64bit ? PPC::ADD8 : PPC::ADD4), Ptr1Reg)
4780 .addReg(ptrA).addReg(ptrB);
4784 BuildMI(BB, dl, TII->get(PPC::RLWINM), Shift1Reg).addReg(Ptr1Reg)
4785 .addImm(3).addImm(27).addImm(is8bit ? 28 : 27);
4786 BuildMI(BB, dl, TII->get(is64bit ? PPC::XORI8 : PPC::XORI), ShiftReg)
4787 .addReg(Shift1Reg).addImm(is8bit ? 24 : 16);
4789 BuildMI(BB, dl, TII->get(PPC::RLDICR), PtrReg)
4790 .addReg(Ptr1Reg).addImm(0).addImm(61);
4792 BuildMI(BB, dl, TII->get(PPC::RLWINM), PtrReg)
4793 .addReg(Ptr1Reg).addImm(0).addImm(0).addImm(29);
4794 BuildMI(BB, dl, TII->get(PPC::SLW), Incr2Reg)
4795 .addReg(incr).addReg(ShiftReg);
4797 BuildMI(BB, dl, TII->get(PPC::LI), Mask2Reg).addImm(255);
4799 BuildMI(BB, dl, TII->get(PPC::LI), Mask3Reg).addImm(0);
4800 BuildMI(BB, dl, TII->get(PPC::ORI),Mask2Reg).addReg(Mask3Reg).addImm(65535);
4802 BuildMI(BB, dl, TII->get(PPC::SLW), MaskReg)
4803 .addReg(Mask2Reg).addReg(ShiftReg);
4806 BuildMI(BB, dl, TII->get(PPC::LWARX), TmpDestReg)
4807 .addReg(ZeroReg).addReg(PtrReg);
4809 BuildMI(BB, dl, TII->get(BinOpcode), TmpReg)
4810 .addReg(Incr2Reg).addReg(TmpDestReg);
4811 BuildMI(BB, dl, TII->get(is64bit ? PPC::ANDC8 : PPC::ANDC), Tmp2Reg)
4812 .addReg(TmpDestReg).addReg(MaskReg);
4813 BuildMI(BB, dl, TII->get(is64bit ? PPC::AND8 : PPC::AND), Tmp3Reg)
4814 .addReg(TmpReg).addReg(MaskReg);
4815 BuildMI(BB, dl, TII->get(is64bit ? PPC::OR8 : PPC::OR), Tmp4Reg)
4816 .addReg(Tmp3Reg).addReg(Tmp2Reg);
4817 BuildMI(BB, dl, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
4818 .addReg(Tmp4Reg).addReg(ZeroReg).addReg(PtrReg);
4819 BuildMI(BB, dl, TII->get(PPC::BCC))
4820 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loopMBB);
4821 BB->addSuccessor(loopMBB);
4822 BB->addSuccessor(exitMBB);
4827 BuildMI(*BB, BB->begin(), dl, TII->get(PPC::SRW), dest).addReg(TmpDestReg)
4833 PPCTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
4834 MachineBasicBlock *BB) const {
4835 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
4837 // To "insert" these instructions we actually have to insert their
4838 // control-flow patterns.
4839 const BasicBlock *LLVM_BB = BB->getBasicBlock();
4840 MachineFunction::iterator It = BB;
4843 MachineFunction *F = BB->getParent();
4845 if (MI->getOpcode() == PPC::SELECT_CC_I4 ||
4846 MI->getOpcode() == PPC::SELECT_CC_I8 ||
4847 MI->getOpcode() == PPC::SELECT_CC_F4 ||
4848 MI->getOpcode() == PPC::SELECT_CC_F8 ||
4849 MI->getOpcode() == PPC::SELECT_CC_VRRC) {
4851 // The incoming instruction knows the destination vreg to set, the
4852 // condition code register to branch on, the true/false values to
4853 // select between, and a branch opcode to use.
4858 // cmpTY ccX, r1, r2
4860 // fallthrough --> copy0MBB
4861 MachineBasicBlock *thisMBB = BB;
4862 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
4863 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
4864 unsigned SelectPred = MI->getOperand(4).getImm();
4865 DebugLoc dl = MI->getDebugLoc();
4866 F->insert(It, copy0MBB);
4867 F->insert(It, sinkMBB);
4869 // Transfer the remainder of BB and its successor edges to sinkMBB.
4870 sinkMBB->splice(sinkMBB->begin(), BB,
4871 llvm::next(MachineBasicBlock::iterator(MI)),
4873 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
4875 // Next, add the true and fallthrough blocks as its successors.
4876 BB->addSuccessor(copy0MBB);
4877 BB->addSuccessor(sinkMBB);
4879 BuildMI(BB, dl, TII->get(PPC::BCC))
4880 .addImm(SelectPred).addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
4883 // %FalseValue = ...
4884 // # fallthrough to sinkMBB
4887 // Update machine-CFG edges
4888 BB->addSuccessor(sinkMBB);
4891 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
4894 BuildMI(*BB, BB->begin(), dl,
4895 TII->get(PPC::PHI), MI->getOperand(0).getReg())
4896 .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
4897 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
4899 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I8)
4900 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::ADD4);
4901 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I16)
4902 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::ADD4);
4903 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I32)
4904 BB = EmitAtomicBinary(MI, BB, false, PPC::ADD4);
4905 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I64)
4906 BB = EmitAtomicBinary(MI, BB, true, PPC::ADD8);
4908 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I8)
4909 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::AND);
4910 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I16)
4911 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::AND);
4912 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I32)
4913 BB = EmitAtomicBinary(MI, BB, false, PPC::AND);
4914 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I64)
4915 BB = EmitAtomicBinary(MI, BB, true, PPC::AND8);
4917 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I8)
4918 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::OR);
4919 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I16)
4920 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::OR);
4921 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I32)
4922 BB = EmitAtomicBinary(MI, BB, false, PPC::OR);
4923 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I64)
4924 BB = EmitAtomicBinary(MI, BB, true, PPC::OR8);
4926 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I8)
4927 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::XOR);
4928 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I16)
4929 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::XOR);
4930 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I32)
4931 BB = EmitAtomicBinary(MI, BB, false, PPC::XOR);
4932 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I64)
4933 BB = EmitAtomicBinary(MI, BB, true, PPC::XOR8);
4935 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I8)
4936 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::ANDC);
4937 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I16)
4938 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::ANDC);
4939 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I32)
4940 BB = EmitAtomicBinary(MI, BB, false, PPC::ANDC);
4941 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I64)
4942 BB = EmitAtomicBinary(MI, BB, true, PPC::ANDC8);
4944 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I8)
4945 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::SUBF);
4946 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I16)
4947 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::SUBF);
4948 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I32)
4949 BB = EmitAtomicBinary(MI, BB, false, PPC::SUBF);
4950 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I64)
4951 BB = EmitAtomicBinary(MI, BB, true, PPC::SUBF8);
4953 else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I8)
4954 BB = EmitPartwordAtomicBinary(MI, BB, true, 0);
4955 else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I16)
4956 BB = EmitPartwordAtomicBinary(MI, BB, false, 0);
4957 else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I32)
4958 BB = EmitAtomicBinary(MI, BB, false, 0);
4959 else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I64)
4960 BB = EmitAtomicBinary(MI, BB, true, 0);
4962 else if (MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I32 ||
4963 MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I64) {
4964 bool is64bit = MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I64;
4966 unsigned dest = MI->getOperand(0).getReg();
4967 unsigned ptrA = MI->getOperand(1).getReg();
4968 unsigned ptrB = MI->getOperand(2).getReg();
4969 unsigned oldval = MI->getOperand(3).getReg();
4970 unsigned newval = MI->getOperand(4).getReg();
4971 DebugLoc dl = MI->getDebugLoc();
4973 MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB);
4974 MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB);
4975 MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
4976 MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
4977 F->insert(It, loop1MBB);
4978 F->insert(It, loop2MBB);
4979 F->insert(It, midMBB);
4980 F->insert(It, exitMBB);
4981 exitMBB->splice(exitMBB->begin(), BB,
4982 llvm::next(MachineBasicBlock::iterator(MI)),
4984 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
4988 // fallthrough --> loopMBB
4989 BB->addSuccessor(loop1MBB);
4992 // l[wd]arx dest, ptr
4993 // cmp[wd] dest, oldval
4996 // st[wd]cx. newval, ptr
5000 // st[wd]cx. dest, ptr
5003 BuildMI(BB, dl, TII->get(is64bit ? PPC::LDARX : PPC::LWARX), dest)
5004 .addReg(ptrA).addReg(ptrB);
5005 BuildMI(BB, dl, TII->get(is64bit ? PPC::CMPD : PPC::CMPW), PPC::CR0)
5006 .addReg(oldval).addReg(dest);
5007 BuildMI(BB, dl, TII->get(PPC::BCC))
5008 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(midMBB);
5009 BB->addSuccessor(loop2MBB);
5010 BB->addSuccessor(midMBB);
5013 BuildMI(BB, dl, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
5014 .addReg(newval).addReg(ptrA).addReg(ptrB);
5015 BuildMI(BB, dl, TII->get(PPC::BCC))
5016 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loop1MBB);
5017 BuildMI(BB, dl, TII->get(PPC::B)).addMBB(exitMBB);
5018 BB->addSuccessor(loop1MBB);
5019 BB->addSuccessor(exitMBB);
5022 BuildMI(BB, dl, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
5023 .addReg(dest).addReg(ptrA).addReg(ptrB);
5024 BB->addSuccessor(exitMBB);
5029 } else if (MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I8 ||
5030 MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I16) {
5031 // We must use 64-bit registers for addresses when targeting 64-bit,
5032 // since we're actually doing arithmetic on them. Other registers
5034 bool is64bit = PPCSubTarget.isPPC64();
5035 bool is8bit = MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I8;
5037 unsigned dest = MI->getOperand(0).getReg();
5038 unsigned ptrA = MI->getOperand(1).getReg();
5039 unsigned ptrB = MI->getOperand(2).getReg();
5040 unsigned oldval = MI->getOperand(3).getReg();
5041 unsigned newval = MI->getOperand(4).getReg();
5042 DebugLoc dl = MI->getDebugLoc();
5044 MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB);
5045 MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB);
5046 MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
5047 MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
5048 F->insert(It, loop1MBB);
5049 F->insert(It, loop2MBB);
5050 F->insert(It, midMBB);
5051 F->insert(It, exitMBB);
5052 exitMBB->splice(exitMBB->begin(), BB,
5053 llvm::next(MachineBasicBlock::iterator(MI)),
5055 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
5057 MachineRegisterInfo &RegInfo = F->getRegInfo();
5058 const TargetRegisterClass *RC =
5059 is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
5060 (const TargetRegisterClass *) &PPC::GPRCRegClass;
5061 unsigned PtrReg = RegInfo.createVirtualRegister(RC);
5062 unsigned Shift1Reg = RegInfo.createVirtualRegister(RC);
5063 unsigned ShiftReg = RegInfo.createVirtualRegister(RC);
5064 unsigned NewVal2Reg = RegInfo.createVirtualRegister(RC);
5065 unsigned NewVal3Reg = RegInfo.createVirtualRegister(RC);
5066 unsigned OldVal2Reg = RegInfo.createVirtualRegister(RC);
5067 unsigned OldVal3Reg = RegInfo.createVirtualRegister(RC);
5068 unsigned MaskReg = RegInfo.createVirtualRegister(RC);
5069 unsigned Mask2Reg = RegInfo.createVirtualRegister(RC);
5070 unsigned Mask3Reg = RegInfo.createVirtualRegister(RC);
5071 unsigned Tmp2Reg = RegInfo.createVirtualRegister(RC);
5072 unsigned Tmp4Reg = RegInfo.createVirtualRegister(RC);
5073 unsigned TmpDestReg = RegInfo.createVirtualRegister(RC);
5075 unsigned TmpReg = RegInfo.createVirtualRegister(RC);
5076 unsigned ZeroReg = is64bit ? PPC::X0 : PPC::R0;
5079 // fallthrough --> loopMBB
5080 BB->addSuccessor(loop1MBB);
5082 // The 4-byte load must be aligned, while a char or short may be
5083 // anywhere in the word. Hence all this nasty bookkeeping code.
5084 // add ptr1, ptrA, ptrB [copy if ptrA==0]
5085 // rlwinm shift1, ptr1, 3, 27, 28 [3, 27, 27]
5086 // xori shift, shift1, 24 [16]
5087 // rlwinm ptr, ptr1, 0, 0, 29
5088 // slw newval2, newval, shift
5089 // slw oldval2, oldval,shift
5090 // li mask2, 255 [li mask3, 0; ori mask2, mask3, 65535]
5091 // slw mask, mask2, shift
5092 // and newval3, newval2, mask
5093 // and oldval3, oldval2, mask
5095 // lwarx tmpDest, ptr
5096 // and tmp, tmpDest, mask
5097 // cmpw tmp, oldval3
5100 // andc tmp2, tmpDest, mask
5101 // or tmp4, tmp2, newval3
5106 // stwcx. tmpDest, ptr
5108 // srw dest, tmpDest, shift
5109 if (ptrA != ZeroReg) {
5110 Ptr1Reg = RegInfo.createVirtualRegister(RC);
5111 BuildMI(BB, dl, TII->get(is64bit ? PPC::ADD8 : PPC::ADD4), Ptr1Reg)
5112 .addReg(ptrA).addReg(ptrB);
5116 BuildMI(BB, dl, TII->get(PPC::RLWINM), Shift1Reg).addReg(Ptr1Reg)
5117 .addImm(3).addImm(27).addImm(is8bit ? 28 : 27);
5118 BuildMI(BB, dl, TII->get(is64bit ? PPC::XORI8 : PPC::XORI), ShiftReg)
5119 .addReg(Shift1Reg).addImm(is8bit ? 24 : 16);
5121 BuildMI(BB, dl, TII->get(PPC::RLDICR), PtrReg)
5122 .addReg(Ptr1Reg).addImm(0).addImm(61);
5124 BuildMI(BB, dl, TII->get(PPC::RLWINM), PtrReg)
5125 .addReg(Ptr1Reg).addImm(0).addImm(0).addImm(29);
5126 BuildMI(BB, dl, TII->get(PPC::SLW), NewVal2Reg)
5127 .addReg(newval).addReg(ShiftReg);
5128 BuildMI(BB, dl, TII->get(PPC::SLW), OldVal2Reg)
5129 .addReg(oldval).addReg(ShiftReg);
5131 BuildMI(BB, dl, TII->get(PPC::LI), Mask2Reg).addImm(255);
5133 BuildMI(BB, dl, TII->get(PPC::LI), Mask3Reg).addImm(0);
5134 BuildMI(BB, dl, TII->get(PPC::ORI), Mask2Reg)
5135 .addReg(Mask3Reg).addImm(65535);
5137 BuildMI(BB, dl, TII->get(PPC::SLW), MaskReg)
5138 .addReg(Mask2Reg).addReg(ShiftReg);
5139 BuildMI(BB, dl, TII->get(PPC::AND), NewVal3Reg)
5140 .addReg(NewVal2Reg).addReg(MaskReg);
5141 BuildMI(BB, dl, TII->get(PPC::AND), OldVal3Reg)
5142 .addReg(OldVal2Reg).addReg(MaskReg);
5145 BuildMI(BB, dl, TII->get(PPC::LWARX), TmpDestReg)
5146 .addReg(ZeroReg).addReg(PtrReg);
5147 BuildMI(BB, dl, TII->get(PPC::AND),TmpReg)
5148 .addReg(TmpDestReg).addReg(MaskReg);
5149 BuildMI(BB, dl, TII->get(PPC::CMPW), PPC::CR0)
5150 .addReg(TmpReg).addReg(OldVal3Reg);
5151 BuildMI(BB, dl, TII->get(PPC::BCC))
5152 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(midMBB);
5153 BB->addSuccessor(loop2MBB);
5154 BB->addSuccessor(midMBB);
5157 BuildMI(BB, dl, TII->get(PPC::ANDC),Tmp2Reg)
5158 .addReg(TmpDestReg).addReg(MaskReg);
5159 BuildMI(BB, dl, TII->get(PPC::OR),Tmp4Reg)
5160 .addReg(Tmp2Reg).addReg(NewVal3Reg);
5161 BuildMI(BB, dl, TII->get(PPC::STWCX)).addReg(Tmp4Reg)
5162 .addReg(ZeroReg).addReg(PtrReg);
5163 BuildMI(BB, dl, TII->get(PPC::BCC))
5164 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loop1MBB);
5165 BuildMI(BB, dl, TII->get(PPC::B)).addMBB(exitMBB);
5166 BB->addSuccessor(loop1MBB);
5167 BB->addSuccessor(exitMBB);
5170 BuildMI(BB, dl, TII->get(PPC::STWCX)).addReg(TmpDestReg)
5171 .addReg(ZeroReg).addReg(PtrReg);
5172 BB->addSuccessor(exitMBB);
5177 BuildMI(*BB, BB->begin(), dl, TII->get(PPC::SRW),dest).addReg(TmpReg)
5180 llvm_unreachable("Unexpected instr type to insert");
5183 MI->eraseFromParent(); // The pseudo instruction is gone now.
5187 //===----------------------------------------------------------------------===//
5188 // Target Optimization Hooks
5189 //===----------------------------------------------------------------------===//
5191 SDValue PPCTargetLowering::PerformDAGCombine(SDNode *N,
5192 DAGCombinerInfo &DCI) const {
5193 const TargetMachine &TM = getTargetMachine();
5194 SelectionDAG &DAG = DCI.DAG;
5195 DebugLoc dl = N->getDebugLoc();
5196 switch (N->getOpcode()) {
5199 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
5200 if (C->isNullValue()) // 0 << V -> 0.
5201 return N->getOperand(0);
5205 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
5206 if (C->isNullValue()) // 0 >>u V -> 0.
5207 return N->getOperand(0);
5211 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
5212 if (C->isNullValue() || // 0 >>s V -> 0.
5213 C->isAllOnesValue()) // -1 >>s V -> -1.
5214 return N->getOperand(0);
5218 case ISD::SINT_TO_FP:
5219 if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
5220 if (N->getOperand(0).getOpcode() == ISD::FP_TO_SINT) {
5221 // Turn (sint_to_fp (fp_to_sint X)) -> fctidz/fcfid without load/stores.
5222 // We allow the src/dst to be either f32/f64, but the intermediate
5223 // type must be i64.
5224 if (N->getOperand(0).getValueType() == MVT::i64 &&
5225 N->getOperand(0).getOperand(0).getValueType() != MVT::ppcf128) {
5226 SDValue Val = N->getOperand(0).getOperand(0);
5227 if (Val.getValueType() == MVT::f32) {
5228 Val = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Val);
5229 DCI.AddToWorklist(Val.getNode());
5232 Val = DAG.getNode(PPCISD::FCTIDZ, dl, MVT::f64, Val);
5233 DCI.AddToWorklist(Val.getNode());
5234 Val = DAG.getNode(PPCISD::FCFID, dl, MVT::f64, Val);
5235 DCI.AddToWorklist(Val.getNode());
5236 if (N->getValueType(0) == MVT::f32) {
5237 Val = DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, Val,
5238 DAG.getIntPtrConstant(0));
5239 DCI.AddToWorklist(Val.getNode());
5242 } else if (N->getOperand(0).getValueType() == MVT::i32) {
5243 // If the intermediate type is i32, we can avoid the load/store here
5250 // Turn STORE (FP_TO_SINT F) -> STFIWX(FCTIWZ(F)).
5251 if (TM.getSubtarget<PPCSubtarget>().hasSTFIWX() &&
5252 !cast<StoreSDNode>(N)->isTruncatingStore() &&
5253 N->getOperand(1).getOpcode() == ISD::FP_TO_SINT &&
5254 N->getOperand(1).getValueType() == MVT::i32 &&
5255 N->getOperand(1).getOperand(0).getValueType() != MVT::ppcf128) {
5256 SDValue Val = N->getOperand(1).getOperand(0);
5257 if (Val.getValueType() == MVT::f32) {
5258 Val = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Val);
5259 DCI.AddToWorklist(Val.getNode());
5261 Val = DAG.getNode(PPCISD::FCTIWZ, dl, MVT::f64, Val);
5262 DCI.AddToWorklist(Val.getNode());
5264 Val = DAG.getNode(PPCISD::STFIWX, dl, MVT::Other, N->getOperand(0), Val,
5265 N->getOperand(2), N->getOperand(3));
5266 DCI.AddToWorklist(Val.getNode());
5270 // Turn STORE (BSWAP) -> sthbrx/stwbrx.
5271 if (cast<StoreSDNode>(N)->isUnindexed() &&
5272 N->getOperand(1).getOpcode() == ISD::BSWAP &&
5273 N->getOperand(1).getNode()->hasOneUse() &&
5274 (N->getOperand(1).getValueType() == MVT::i32 ||
5275 N->getOperand(1).getValueType() == MVT::i16)) {
5276 SDValue BSwapOp = N->getOperand(1).getOperand(0);
5277 // Do an any-extend to 32-bits if this is a half-word input.
5278 if (BSwapOp.getValueType() == MVT::i16)
5279 BSwapOp = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, BSwapOp);
5282 N->getOperand(0), BSwapOp, N->getOperand(2),
5283 DAG.getValueType(N->getOperand(1).getValueType())
5286 DAG.getMemIntrinsicNode(PPCISD::STBRX, dl, DAG.getVTList(MVT::Other),
5287 Ops, array_lengthof(Ops),
5288 cast<StoreSDNode>(N)->getMemoryVT(),
5289 cast<StoreSDNode>(N)->getMemOperand());
5293 // Turn BSWAP (LOAD) -> lhbrx/lwbrx.
5294 if (ISD::isNON_EXTLoad(N->getOperand(0).getNode()) &&
5295 N->getOperand(0).hasOneUse() &&
5296 (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i16)) {
5297 SDValue Load = N->getOperand(0);
5298 LoadSDNode *LD = cast<LoadSDNode>(Load);
5299 // Create the byte-swapping load.
5301 LD->getChain(), // Chain
5302 LD->getBasePtr(), // Ptr
5303 DAG.getValueType(N->getValueType(0)) // VT
5306 DAG.getMemIntrinsicNode(PPCISD::LBRX, dl,
5307 DAG.getVTList(MVT::i32, MVT::Other), Ops, 3,
5308 LD->getMemoryVT(), LD->getMemOperand());
5310 // If this is an i16 load, insert the truncate.
5311 SDValue ResVal = BSLoad;
5312 if (N->getValueType(0) == MVT::i16)
5313 ResVal = DAG.getNode(ISD::TRUNCATE, dl, MVT::i16, BSLoad);
5315 // First, combine the bswap away. This makes the value produced by the
5317 DCI.CombineTo(N, ResVal);
5319 // Next, combine the load away, we give it a bogus result value but a real
5320 // chain result. The result value is dead because the bswap is dead.
5321 DCI.CombineTo(Load.getNode(), ResVal, BSLoad.getValue(1));
5323 // Return N so it doesn't get rechecked!
5324 return SDValue(N, 0);
5328 case PPCISD::VCMP: {
5329 // If a VCMPo node already exists with exactly the same operands as this
5330 // node, use its result instead of this node (VCMPo computes both a CR6 and
5331 // a normal output).
5333 if (!N->getOperand(0).hasOneUse() &&
5334 !N->getOperand(1).hasOneUse() &&
5335 !N->getOperand(2).hasOneUse()) {
5337 // Scan all of the users of the LHS, looking for VCMPo's that match.
5338 SDNode *VCMPoNode = 0;
5340 SDNode *LHSN = N->getOperand(0).getNode();
5341 for (SDNode::use_iterator UI = LHSN->use_begin(), E = LHSN->use_end();
5343 if (UI->getOpcode() == PPCISD::VCMPo &&
5344 UI->getOperand(1) == N->getOperand(1) &&
5345 UI->getOperand(2) == N->getOperand(2) &&
5346 UI->getOperand(0) == N->getOperand(0)) {
5351 // If there is no VCMPo node, or if the flag value has a single use, don't
5353 if (!VCMPoNode || VCMPoNode->hasNUsesOfValue(0, 1))
5356 // Look at the (necessarily single) use of the flag value. If it has a
5357 // chain, this transformation is more complex. Note that multiple things
5358 // could use the value result, which we should ignore.
5359 SDNode *FlagUser = 0;
5360 for (SDNode::use_iterator UI = VCMPoNode->use_begin();
5361 FlagUser == 0; ++UI) {
5362 assert(UI != VCMPoNode->use_end() && "Didn't find user!");
5364 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
5365 if (User->getOperand(i) == SDValue(VCMPoNode, 1)) {
5372 // If the user is a MFCR instruction, we know this is safe. Otherwise we
5373 // give up for right now.
5374 if (FlagUser->getOpcode() == PPCISD::MFCR)
5375 return SDValue(VCMPoNode, 0);
5380 // If this is a branch on an altivec predicate comparison, lower this so
5381 // that we don't have to do a MFCR: instead, branch directly on CR6. This
5382 // lowering is done pre-legalize, because the legalizer lowers the predicate
5383 // compare down to code that is difficult to reassemble.
5384 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
5385 SDValue LHS = N->getOperand(2), RHS = N->getOperand(3);
5389 if (LHS.getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
5390 isa<ConstantSDNode>(RHS) && (CC == ISD::SETEQ || CC == ISD::SETNE) &&
5391 getAltivecCompareInfo(LHS, CompareOpc, isDot)) {
5392 assert(isDot && "Can't compare against a vector result!");
5394 // If this is a comparison against something other than 0/1, then we know
5395 // that the condition is never/always true.
5396 unsigned Val = cast<ConstantSDNode>(RHS)->getZExtValue();
5397 if (Val != 0 && Val != 1) {
5398 if (CC == ISD::SETEQ) // Cond never true, remove branch.
5399 return N->getOperand(0);
5400 // Always !=, turn it into an unconditional branch.
5401 return DAG.getNode(ISD::BR, dl, MVT::Other,
5402 N->getOperand(0), N->getOperand(4));
5405 bool BranchOnWhenPredTrue = (CC == ISD::SETEQ) ^ (Val == 0);
5407 // Create the PPCISD altivec 'dot' comparison node.
5408 std::vector<EVT> VTs;
5410 LHS.getOperand(2), // LHS of compare
5411 LHS.getOperand(3), // RHS of compare
5412 DAG.getConstant(CompareOpc, MVT::i32)
5414 VTs.push_back(LHS.getOperand(2).getValueType());
5415 VTs.push_back(MVT::Glue);
5416 SDValue CompNode = DAG.getNode(PPCISD::VCMPo, dl, VTs, Ops, 3);
5418 // Unpack the result based on how the target uses it.
5419 PPC::Predicate CompOpc;
5420 switch (cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue()) {
5421 default: // Can't happen, don't crash on invalid number though.
5422 case 0: // Branch on the value of the EQ bit of CR6.
5423 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_EQ : PPC::PRED_NE;
5425 case 1: // Branch on the inverted value of the EQ bit of CR6.
5426 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_NE : PPC::PRED_EQ;
5428 case 2: // Branch on the value of the LT bit of CR6.
5429 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_LT : PPC::PRED_GE;
5431 case 3: // Branch on the inverted value of the LT bit of CR6.
5432 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_GE : PPC::PRED_LT;
5436 return DAG.getNode(PPCISD::COND_BRANCH, dl, MVT::Other, N->getOperand(0),
5437 DAG.getConstant(CompOpc, MVT::i32),
5438 DAG.getRegister(PPC::CR6, MVT::i32),
5439 N->getOperand(4), CompNode.getValue(1));
5448 //===----------------------------------------------------------------------===//
5449 // Inline Assembly Support
5450 //===----------------------------------------------------------------------===//
5452 void PPCTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
5456 const SelectionDAG &DAG,
5457 unsigned Depth) const {
5458 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
5459 switch (Op.getOpcode()) {
5461 case PPCISD::LBRX: {
5462 // lhbrx is known to have the top bits cleared out.
5463 if (cast<VTSDNode>(Op.getOperand(2))->getVT() == MVT::i16)
5464 KnownZero = 0xFFFF0000;
5467 case ISD::INTRINSIC_WO_CHAIN: {
5468 switch (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue()) {
5470 case Intrinsic::ppc_altivec_vcmpbfp_p:
5471 case Intrinsic::ppc_altivec_vcmpeqfp_p:
5472 case Intrinsic::ppc_altivec_vcmpequb_p:
5473 case Intrinsic::ppc_altivec_vcmpequh_p:
5474 case Intrinsic::ppc_altivec_vcmpequw_p:
5475 case Intrinsic::ppc_altivec_vcmpgefp_p:
5476 case Intrinsic::ppc_altivec_vcmpgtfp_p:
5477 case Intrinsic::ppc_altivec_vcmpgtsb_p:
5478 case Intrinsic::ppc_altivec_vcmpgtsh_p:
5479 case Intrinsic::ppc_altivec_vcmpgtsw_p:
5480 case Intrinsic::ppc_altivec_vcmpgtub_p:
5481 case Intrinsic::ppc_altivec_vcmpgtuh_p:
5482 case Intrinsic::ppc_altivec_vcmpgtuw_p:
5483 KnownZero = ~1U; // All bits but the low one are known to be zero.
5491 /// getConstraintType - Given a constraint, return the type of
5492 /// constraint it is for this target.
5493 PPCTargetLowering::ConstraintType
5494 PPCTargetLowering::getConstraintType(const std::string &Constraint) const {
5495 if (Constraint.size() == 1) {
5496 switch (Constraint[0]) {
5503 return C_RegisterClass;
5506 return TargetLowering::getConstraintType(Constraint);
5509 /// Examine constraint type and operand type and determine a weight value.
5510 /// This object must already have been set up with the operand type
5511 /// and the current alternative constraint selected.
5512 TargetLowering::ConstraintWeight
5513 PPCTargetLowering::getSingleConstraintMatchWeight(
5514 AsmOperandInfo &info, const char *constraint) const {
5515 ConstraintWeight weight = CW_Invalid;
5516 Value *CallOperandVal = info.CallOperandVal;
5517 // If we don't have a value, we can't do a match,
5518 // but allow it at the lowest weight.
5519 if (CallOperandVal == NULL)
5521 Type *type = CallOperandVal->getType();
5522 // Look at the constraint type.
5523 switch (*constraint) {
5525 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
5528 if (type->isIntegerTy())
5529 weight = CW_Register;
5532 if (type->isFloatTy())
5533 weight = CW_Register;
5536 if (type->isDoubleTy())
5537 weight = CW_Register;
5540 if (type->isVectorTy())
5541 weight = CW_Register;
5544 weight = CW_Register;
5550 std::pair<unsigned, const TargetRegisterClass*>
5551 PPCTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
5553 if (Constraint.size() == 1) {
5554 // GCC RS6000 Constraint Letters
5555 switch (Constraint[0]) {
5558 if (VT == MVT::i64 && PPCSubTarget.isPPC64())
5559 return std::make_pair(0U, PPC::G8RCRegisterClass);
5560 return std::make_pair(0U, PPC::GPRCRegisterClass);
5563 return std::make_pair(0U, PPC::F4RCRegisterClass);
5564 else if (VT == MVT::f64)
5565 return std::make_pair(0U, PPC::F8RCRegisterClass);
5568 return std::make_pair(0U, PPC::VRRCRegisterClass);
5570 return std::make_pair(0U, PPC::CRRCRegisterClass);
5574 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
5578 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
5579 /// vector. If it is invalid, don't add anything to Ops.
5580 void PPCTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
5581 std::string &Constraint,
5582 std::vector<SDValue>&Ops,
5583 SelectionDAG &DAG) const {
5584 SDValue Result(0,0);
5586 // Only support length 1 constraints.
5587 if (Constraint.length() > 1) return;
5589 char Letter = Constraint[0];
5600 ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op);
5601 if (!CST) return; // Must be an immediate to match.
5602 unsigned Value = CST->getZExtValue();
5604 default: llvm_unreachable("Unknown constraint letter!");
5605 case 'I': // "I" is a signed 16-bit constant.
5606 if ((short)Value == (int)Value)
5607 Result = DAG.getTargetConstant(Value, Op.getValueType());
5609 case 'J': // "J" is a constant with only the high-order 16 bits nonzero.
5610 case 'L': // "L" is a signed 16-bit constant shifted left 16 bits.
5611 if ((short)Value == 0)
5612 Result = DAG.getTargetConstant(Value, Op.getValueType());
5614 case 'K': // "K" is a constant with only the low-order 16 bits nonzero.
5615 if ((Value >> 16) == 0)
5616 Result = DAG.getTargetConstant(Value, Op.getValueType());
5618 case 'M': // "M" is a constant that is greater than 31.
5620 Result = DAG.getTargetConstant(Value, Op.getValueType());
5622 case 'N': // "N" is a positive constant that is an exact power of two.
5623 if ((int)Value > 0 && isPowerOf2_32(Value))
5624 Result = DAG.getTargetConstant(Value, Op.getValueType());
5626 case 'O': // "O" is the constant zero.
5628 Result = DAG.getTargetConstant(Value, Op.getValueType());
5630 case 'P': // "P" is a constant whose negation is a signed 16-bit constant.
5631 if ((short)-Value == (int)-Value)
5632 Result = DAG.getTargetConstant(Value, Op.getValueType());
5639 if (Result.getNode()) {
5640 Ops.push_back(Result);
5644 // Handle standard constraint letters.
5645 TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
5648 // isLegalAddressingMode - Return true if the addressing mode represented
5649 // by AM is legal for this target, for a load/store of the specified type.
5650 bool PPCTargetLowering::isLegalAddressingMode(const AddrMode &AM,
5652 // FIXME: PPC does not allow r+i addressing modes for vectors!
5654 // PPC allows a sign-extended 16-bit immediate field.
5655 if (AM.BaseOffs <= -(1LL << 16) || AM.BaseOffs >= (1LL << 16)-1)
5658 // No global is ever allowed as a base.
5662 // PPC only support r+r,
5664 case 0: // "r+i" or just "i", depending on HasBaseReg.
5667 if (AM.HasBaseReg && AM.BaseOffs) // "r+r+i" is not allowed.
5669 // Otherwise we have r+r or r+i.
5672 if (AM.HasBaseReg || AM.BaseOffs) // 2*r+r or 2*r+i is not allowed.
5674 // Allow 2*r as r+r.
5677 // No other scales are supported.
5684 /// isLegalAddressImmediate - Return true if the integer value can be used
5685 /// as the offset of the target addressing mode for load / store of the
5687 bool PPCTargetLowering::isLegalAddressImmediate(int64_t V,Type *Ty) const{
5688 // PPC allows a sign-extended 16-bit immediate field.
5689 return (V > -(1 << 16) && V < (1 << 16)-1);
5692 bool PPCTargetLowering::isLegalAddressImmediate(llvm::GlobalValue* GV) const {
5696 SDValue PPCTargetLowering::LowerRETURNADDR(SDValue Op,
5697 SelectionDAG &DAG) const {
5698 MachineFunction &MF = DAG.getMachineFunction();
5699 MachineFrameInfo *MFI = MF.getFrameInfo();
5700 MFI->setReturnAddressIsTaken(true);
5702 DebugLoc dl = Op.getDebugLoc();
5703 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
5705 // Make sure the function does not optimize away the store of the RA to
5707 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
5708 FuncInfo->setLRStoreRequired();
5709 bool isPPC64 = PPCSubTarget.isPPC64();
5710 bool isDarwinABI = PPCSubTarget.isDarwinABI();
5713 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
5716 DAG.getConstant(PPCFrameLowering::getReturnSaveOffset(isPPC64, isDarwinABI),
5717 isPPC64? MVT::i64 : MVT::i32);
5718 return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
5719 DAG.getNode(ISD::ADD, dl, getPointerTy(),
5721 MachinePointerInfo(), false, false, 0);
5724 // Just load the return address off the stack.
5725 SDValue RetAddrFI = getReturnAddrFrameIndex(DAG);
5726 return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
5727 RetAddrFI, MachinePointerInfo(), false, false, 0);
5730 SDValue PPCTargetLowering::LowerFRAMEADDR(SDValue Op,
5731 SelectionDAG &DAG) const {
5732 DebugLoc dl = Op.getDebugLoc();
5733 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
5735 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
5736 bool isPPC64 = PtrVT == MVT::i64;
5738 MachineFunction &MF = DAG.getMachineFunction();
5739 MachineFrameInfo *MFI = MF.getFrameInfo();
5740 MFI->setFrameAddressIsTaken(true);
5741 bool is31 = (DisableFramePointerElim(MF) || MFI->hasVarSizedObjects()) &&
5742 MFI->getStackSize() &&
5743 !MF.getFunction()->hasFnAttr(Attribute::Naked);
5744 unsigned FrameReg = isPPC64 ? (is31 ? PPC::X31 : PPC::X1) :
5745 (is31 ? PPC::R31 : PPC::R1);
5746 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg,
5749 FrameAddr = DAG.getLoad(Op.getValueType(), dl, DAG.getEntryNode(),
5750 FrameAddr, MachinePointerInfo(), false, false, 0);
5755 PPCTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
5756 // The PowerPC target isn't yet aware of offsets.
5760 /// getOptimalMemOpType - Returns the target specific optimal type for load
5761 /// and store operations as a result of memset, memcpy, and memmove
5762 /// lowering. If DstAlign is zero that means it's safe to destination
5763 /// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
5764 /// means there isn't a need to check it against alignment requirement,
5765 /// probably because the source does not need to be loaded. If
5766 /// 'NonScalarIntSafe' is true, that means it's safe to return a
5767 /// non-scalar-integer type, e.g. empty string source, constant, or loaded
5768 /// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
5769 /// constant so it does not need to be loaded.
5770 /// It returns EVT::Other if the type should be determined using generic
5771 /// target-independent logic.
5772 EVT PPCTargetLowering::getOptimalMemOpType(uint64_t Size,
5773 unsigned DstAlign, unsigned SrcAlign,
5774 bool NonScalarIntSafe,
5776 MachineFunction &MF) const {
5777 if (this->PPCSubTarget.isPPC64()) {