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 "PPCPredicates.h"
17 #include "PPCTargetMachine.h"
18 #include "PPCPerfectShuffle.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/CallingConv.h"
29 #include "llvm/Constants.h"
30 #include "llvm/Function.h"
31 #include "llvm/Intrinsics.h"
32 #include "llvm/ParameterAttributes.h"
33 #include "llvm/Support/MathExtras.h"
34 #include "llvm/Target/TargetOptions.h"
35 #include "llvm/Support/CommandLine.h"
38 static cl::opt<bool> EnablePPCPreinc("enable-ppc-preinc",
39 cl::desc("enable preincrement load/store generation on PPC (experimental)"),
42 PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
43 : TargetLowering(TM), PPCSubTarget(*TM.getSubtargetImpl()) {
47 // Use _setjmp/_longjmp instead of setjmp/longjmp.
48 setUseUnderscoreSetJmp(true);
49 setUseUnderscoreLongJmp(true);
51 // Set up the register classes.
52 addRegisterClass(MVT::i32, PPC::GPRCRegisterClass);
53 addRegisterClass(MVT::f32, PPC::F4RCRegisterClass);
54 addRegisterClass(MVT::f64, PPC::F8RCRegisterClass);
56 // PowerPC has an i16 but no i8 (or i1) SEXTLOAD
57 setLoadXAction(ISD::SEXTLOAD, MVT::i1, Promote);
58 setLoadXAction(ISD::SEXTLOAD, MVT::i8, Expand);
60 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
62 // PowerPC has pre-inc load and store's.
63 setIndexedLoadAction(ISD::PRE_INC, MVT::i1, Legal);
64 setIndexedLoadAction(ISD::PRE_INC, MVT::i8, Legal);
65 setIndexedLoadAction(ISD::PRE_INC, MVT::i16, Legal);
66 setIndexedLoadAction(ISD::PRE_INC, MVT::i32, Legal);
67 setIndexedLoadAction(ISD::PRE_INC, MVT::i64, Legal);
68 setIndexedStoreAction(ISD::PRE_INC, MVT::i1, Legal);
69 setIndexedStoreAction(ISD::PRE_INC, MVT::i8, Legal);
70 setIndexedStoreAction(ISD::PRE_INC, MVT::i16, Legal);
71 setIndexedStoreAction(ISD::PRE_INC, MVT::i32, Legal);
72 setIndexedStoreAction(ISD::PRE_INC, MVT::i64, Legal);
74 // Shortening conversions involving ppcf128 get expanded (2 regs -> 1 reg)
75 setConvertAction(MVT::ppcf128, MVT::f64, Expand);
76 setConvertAction(MVT::ppcf128, MVT::f32, Expand);
77 // This is used in the ppcf128->int sequence. Note it has different semantics
78 // from FP_ROUND: that rounds to nearest, this rounds to zero.
79 setOperationAction(ISD::FP_ROUND_INREG, MVT::ppcf128, Custom);
81 // PowerPC has no SREM/UREM instructions
82 setOperationAction(ISD::SREM, MVT::i32, Expand);
83 setOperationAction(ISD::UREM, MVT::i32, Expand);
84 setOperationAction(ISD::SREM, MVT::i64, Expand);
85 setOperationAction(ISD::UREM, MVT::i64, Expand);
87 // Don't use SMUL_LOHI/UMUL_LOHI or SDIVREM/UDIVREM to lower SREM/UREM.
88 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
89 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
90 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
91 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
92 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
93 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
94 setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
95 setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
97 // We don't support sin/cos/sqrt/fmod/pow
98 setOperationAction(ISD::FSIN , MVT::f64, Expand);
99 setOperationAction(ISD::FCOS , MVT::f64, Expand);
100 setOperationAction(ISD::FREM , MVT::f64, Expand);
101 setOperationAction(ISD::FPOW , MVT::f64, Expand);
102 setOperationAction(ISD::FLOG , MVT::f64, Expand);
103 setOperationAction(ISD::FLOG2, MVT::f64, Expand);
104 setOperationAction(ISD::FLOG10,MVT::f64, Expand);
105 setOperationAction(ISD::FEXP ,MVT::f64, Expand);
106 setOperationAction(ISD::FEXP2 ,MVT::f64, Expand);
107 setOperationAction(ISD::FSIN , MVT::f32, Expand);
108 setOperationAction(ISD::FCOS , MVT::f32, Expand);
109 setOperationAction(ISD::FREM , MVT::f32, Expand);
110 setOperationAction(ISD::FPOW , MVT::f32, Expand);
111 setOperationAction(ISD::FLOG , MVT::f32, Expand);
112 setOperationAction(ISD::FLOG2 ,MVT::f32, Expand);
113 setOperationAction(ISD::FLOG10,MVT::f32, Expand);
114 setOperationAction(ISD::FEXP ,MVT::f32, Expand);
115 setOperationAction(ISD::FEXP2 ,MVT::f32, Expand);
117 setOperationAction(ISD::FLT_ROUNDS_, MVT::i32, Custom);
119 // If we're enabling GP optimizations, use hardware square root
120 if (!TM.getSubtarget<PPCSubtarget>().hasFSQRT()) {
121 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
122 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
125 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
126 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
128 // PowerPC does not have BSWAP, CTPOP or CTTZ
129 setOperationAction(ISD::BSWAP, MVT::i32 , Expand);
130 setOperationAction(ISD::CTPOP, MVT::i32 , Expand);
131 setOperationAction(ISD::CTTZ , MVT::i32 , Expand);
132 setOperationAction(ISD::BSWAP, MVT::i64 , Expand);
133 setOperationAction(ISD::CTPOP, MVT::i64 , Expand);
134 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
136 // PowerPC does not have ROTR
137 setOperationAction(ISD::ROTR, MVT::i32 , Expand);
138 setOperationAction(ISD::ROTR, MVT::i64 , Expand);
140 // PowerPC does not have Select
141 setOperationAction(ISD::SELECT, MVT::i32, Expand);
142 setOperationAction(ISD::SELECT, MVT::i64, Expand);
143 setOperationAction(ISD::SELECT, MVT::f32, Expand);
144 setOperationAction(ISD::SELECT, MVT::f64, Expand);
146 // PowerPC wants to turn select_cc of FP into fsel when possible.
147 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
148 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
150 // PowerPC wants to optimize integer setcc a bit
151 setOperationAction(ISD::SETCC, MVT::i32, Custom);
153 // PowerPC does not have BRCOND which requires SetCC
154 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
156 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
158 // PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
159 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
161 // PowerPC does not have [U|S]INT_TO_FP
162 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
163 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
165 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
166 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
167 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Expand);
168 setOperationAction(ISD::BIT_CONVERT, MVT::f64, Expand);
170 // We cannot sextinreg(i1). Expand to shifts.
171 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
173 // Support label based line numbers.
174 setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
175 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
177 setOperationAction(ISD::EXCEPTIONADDR, MVT::i64, Expand);
178 setOperationAction(ISD::EHSELECTION, MVT::i64, Expand);
179 setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
180 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
183 // We want to legalize GlobalAddress and ConstantPool nodes into the
184 // appropriate instructions to materialize the address.
185 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
186 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
187 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
188 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
189 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
190 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
191 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
192 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
194 // RET must be custom lowered, to meet ABI requirements.
195 setOperationAction(ISD::RET , MVT::Other, Custom);
198 setOperationAction(ISD::TRAP, MVT::Other, Legal);
200 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
201 setOperationAction(ISD::VASTART , MVT::Other, Custom);
203 // VAARG is custom lowered with ELF 32 ABI
204 if (TM.getSubtarget<PPCSubtarget>().isELF32_ABI())
205 setOperationAction(ISD::VAARG, MVT::Other, Custom);
207 setOperationAction(ISD::VAARG, MVT::Other, Expand);
209 // Use the default implementation.
210 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
211 setOperationAction(ISD::VAEND , MVT::Other, Expand);
212 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
213 setOperationAction(ISD::STACKRESTORE , MVT::Other, Custom);
214 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
215 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64 , Custom);
217 // We want to custom lower some of our intrinsics.
218 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
220 if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
221 // They also have instructions for converting between i64 and fp.
222 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
223 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
224 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
225 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
226 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
228 // FIXME: disable this lowered code. This generates 64-bit register values,
229 // and we don't model the fact that the top part is clobbered by calls. We
230 // need to flag these together so that the value isn't live across a call.
231 //setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
233 // To take advantage of the above i64 FP_TO_SINT, promote i32 FP_TO_UINT
234 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Promote);
236 // PowerPC does not have FP_TO_UINT on 32-bit implementations.
237 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
240 if (TM.getSubtarget<PPCSubtarget>().use64BitRegs()) {
241 // 64-bit PowerPC implementations can support i64 types directly
242 addRegisterClass(MVT::i64, PPC::G8RCRegisterClass);
243 // BUILD_PAIR can't be handled natively, and should be expanded to shl/or
244 setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
245 // 64-bit PowerPC wants to expand i128 shifts itself.
246 setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
247 setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
248 setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
250 // 32-bit PowerPC wants to expand i64 shifts itself.
251 setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
252 setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
253 setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
256 if (TM.getSubtarget<PPCSubtarget>().hasAltivec()) {
257 // First set operation action for all vector types to expand. Then we
258 // will selectively turn on ones that can be effectively codegen'd.
259 for (unsigned i = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
260 i <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++i) {
261 MVT VT = (MVT::SimpleValueType)i;
263 // add/sub are legal for all supported vector VT's.
264 setOperationAction(ISD::ADD , VT, Legal);
265 setOperationAction(ISD::SUB , VT, Legal);
267 // We promote all shuffles to v16i8.
268 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Promote);
269 AddPromotedToType (ISD::VECTOR_SHUFFLE, VT, MVT::v16i8);
271 // We promote all non-typed operations to v4i32.
272 setOperationAction(ISD::AND , VT, Promote);
273 AddPromotedToType (ISD::AND , VT, MVT::v4i32);
274 setOperationAction(ISD::OR , VT, Promote);
275 AddPromotedToType (ISD::OR , VT, MVT::v4i32);
276 setOperationAction(ISD::XOR , VT, Promote);
277 AddPromotedToType (ISD::XOR , VT, MVT::v4i32);
278 setOperationAction(ISD::LOAD , VT, Promote);
279 AddPromotedToType (ISD::LOAD , VT, MVT::v4i32);
280 setOperationAction(ISD::SELECT, VT, Promote);
281 AddPromotedToType (ISD::SELECT, VT, MVT::v4i32);
282 setOperationAction(ISD::STORE, VT, Promote);
283 AddPromotedToType (ISD::STORE, VT, MVT::v4i32);
285 // No other operations are legal.
286 setOperationAction(ISD::MUL , VT, Expand);
287 setOperationAction(ISD::SDIV, VT, Expand);
288 setOperationAction(ISD::SREM, VT, Expand);
289 setOperationAction(ISD::UDIV, VT, Expand);
290 setOperationAction(ISD::UREM, VT, Expand);
291 setOperationAction(ISD::FDIV, VT, Expand);
292 setOperationAction(ISD::FNEG, VT, Expand);
293 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Expand);
294 setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Expand);
295 setOperationAction(ISD::BUILD_VECTOR, VT, Expand);
296 setOperationAction(ISD::UMUL_LOHI, VT, Expand);
297 setOperationAction(ISD::SMUL_LOHI, VT, Expand);
298 setOperationAction(ISD::UDIVREM, VT, Expand);
299 setOperationAction(ISD::SDIVREM, VT, Expand);
300 setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Expand);
301 setOperationAction(ISD::FPOW, VT, Expand);
302 setOperationAction(ISD::CTPOP, VT, Expand);
303 setOperationAction(ISD::CTLZ, VT, Expand);
304 setOperationAction(ISD::CTTZ, VT, Expand);
307 // We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
308 // with merges, splats, etc.
309 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
311 setOperationAction(ISD::AND , MVT::v4i32, Legal);
312 setOperationAction(ISD::OR , MVT::v4i32, Legal);
313 setOperationAction(ISD::XOR , MVT::v4i32, Legal);
314 setOperationAction(ISD::LOAD , MVT::v4i32, Legal);
315 setOperationAction(ISD::SELECT, MVT::v4i32, Expand);
316 setOperationAction(ISD::STORE , MVT::v4i32, Legal);
318 addRegisterClass(MVT::v4f32, PPC::VRRCRegisterClass);
319 addRegisterClass(MVT::v4i32, PPC::VRRCRegisterClass);
320 addRegisterClass(MVT::v8i16, PPC::VRRCRegisterClass);
321 addRegisterClass(MVT::v16i8, PPC::VRRCRegisterClass);
323 setOperationAction(ISD::MUL, MVT::v4f32, Legal);
324 setOperationAction(ISD::MUL, MVT::v4i32, Custom);
325 setOperationAction(ISD::MUL, MVT::v8i16, Custom);
326 setOperationAction(ISD::MUL, MVT::v16i8, Custom);
328 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Custom);
329 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Custom);
331 setOperationAction(ISD::BUILD_VECTOR, MVT::v16i8, Custom);
332 setOperationAction(ISD::BUILD_VECTOR, MVT::v8i16, Custom);
333 setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32, Custom);
334 setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
337 setShiftAmountType(MVT::i32);
338 setSetCCResultContents(ZeroOrOneSetCCResult);
340 if (TM.getSubtarget<PPCSubtarget>().isPPC64()) {
341 setStackPointerRegisterToSaveRestore(PPC::X1);
342 setExceptionPointerRegister(PPC::X3);
343 setExceptionSelectorRegister(PPC::X4);
345 setStackPointerRegisterToSaveRestore(PPC::R1);
346 setExceptionPointerRegister(PPC::R3);
347 setExceptionSelectorRegister(PPC::R4);
350 // We have target-specific dag combine patterns for the following nodes:
351 setTargetDAGCombine(ISD::SINT_TO_FP);
352 setTargetDAGCombine(ISD::STORE);
353 setTargetDAGCombine(ISD::BR_CC);
354 setTargetDAGCombine(ISD::BSWAP);
356 // Darwin long double math library functions have $LDBL128 appended.
357 if (TM.getSubtarget<PPCSubtarget>().isDarwin()) {
358 setLibcallName(RTLIB::COS_PPCF128, "cosl$LDBL128");
359 setLibcallName(RTLIB::POW_PPCF128, "powl$LDBL128");
360 setLibcallName(RTLIB::REM_PPCF128, "fmodl$LDBL128");
361 setLibcallName(RTLIB::SIN_PPCF128, "sinl$LDBL128");
362 setLibcallName(RTLIB::SQRT_PPCF128, "sqrtl$LDBL128");
363 setLibcallName(RTLIB::LOG_PPCF128, "logl$LDBL128");
364 setLibcallName(RTLIB::LOG2_PPCF128, "log2l$LDBL128");
365 setLibcallName(RTLIB::LOG10_PPCF128, "log10l$LDBL128");
366 setLibcallName(RTLIB::EXP_PPCF128, "expl$LDBL128");
367 setLibcallName(RTLIB::EXP2_PPCF128, "exp2l$LDBL128");
370 computeRegisterProperties();
373 /// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
374 /// function arguments in the caller parameter area.
375 unsigned PPCTargetLowering::getByValTypeAlignment(const Type *Ty) const {
376 TargetMachine &TM = getTargetMachine();
377 // Darwin passes everything on 4 byte boundary.
378 if (TM.getSubtarget<PPCSubtarget>().isDarwin())
384 const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
387 case PPCISD::FSEL: return "PPCISD::FSEL";
388 case PPCISD::FCFID: return "PPCISD::FCFID";
389 case PPCISD::FCTIDZ: return "PPCISD::FCTIDZ";
390 case PPCISD::FCTIWZ: return "PPCISD::FCTIWZ";
391 case PPCISD::STFIWX: return "PPCISD::STFIWX";
392 case PPCISD::VMADDFP: return "PPCISD::VMADDFP";
393 case PPCISD::VNMSUBFP: return "PPCISD::VNMSUBFP";
394 case PPCISD::VPERM: return "PPCISD::VPERM";
395 case PPCISD::Hi: return "PPCISD::Hi";
396 case PPCISD::Lo: return "PPCISD::Lo";
397 case PPCISD::DYNALLOC: return "PPCISD::DYNALLOC";
398 case PPCISD::GlobalBaseReg: return "PPCISD::GlobalBaseReg";
399 case PPCISD::SRL: return "PPCISD::SRL";
400 case PPCISD::SRA: return "PPCISD::SRA";
401 case PPCISD::SHL: return "PPCISD::SHL";
402 case PPCISD::EXTSW_32: return "PPCISD::EXTSW_32";
403 case PPCISD::STD_32: return "PPCISD::STD_32";
404 case PPCISD::CALL_ELF: return "PPCISD::CALL_ELF";
405 case PPCISD::CALL_Macho: return "PPCISD::CALL_Macho";
406 case PPCISD::MTCTR: return "PPCISD::MTCTR";
407 case PPCISD::BCTRL_Macho: return "PPCISD::BCTRL_Macho";
408 case PPCISD::BCTRL_ELF: return "PPCISD::BCTRL_ELF";
409 case PPCISD::RET_FLAG: return "PPCISD::RET_FLAG";
410 case PPCISD::MFCR: return "PPCISD::MFCR";
411 case PPCISD::VCMP: return "PPCISD::VCMP";
412 case PPCISD::VCMPo: return "PPCISD::VCMPo";
413 case PPCISD::LBRX: return "PPCISD::LBRX";
414 case PPCISD::STBRX: return "PPCISD::STBRX";
415 case PPCISD::LARX: return "PPCISD::LARX";
416 case PPCISD::STCX: return "PPCISD::STCX";
417 case PPCISD::COND_BRANCH: return "PPCISD::COND_BRANCH";
418 case PPCISD::MFFS: return "PPCISD::MFFS";
419 case PPCISD::MTFSB0: return "PPCISD::MTFSB0";
420 case PPCISD::MTFSB1: return "PPCISD::MTFSB1";
421 case PPCISD::FADDRTZ: return "PPCISD::FADDRTZ";
422 case PPCISD::MTFSF: return "PPCISD::MTFSF";
423 case PPCISD::TAILCALL: return "PPCISD::TAILCALL";
424 case PPCISD::TC_RETURN: return "PPCISD::TC_RETURN";
429 MVT PPCTargetLowering::getSetCCResultType(const SDValue &) const {
434 //===----------------------------------------------------------------------===//
435 // Node matching predicates, for use by the tblgen matching code.
436 //===----------------------------------------------------------------------===//
438 /// isFloatingPointZero - Return true if this is 0.0 or -0.0.
439 static bool isFloatingPointZero(SDValue Op) {
440 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
441 return CFP->getValueAPF().isZero();
442 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
443 // Maybe this has already been legalized into the constant pool?
444 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
445 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
446 return CFP->getValueAPF().isZero();
451 /// isConstantOrUndef - Op is either an undef node or a ConstantSDNode. Return
452 /// true if Op is undef or if it matches the specified value.
453 static bool isConstantOrUndef(SDValue Op, unsigned Val) {
454 return Op.getOpcode() == ISD::UNDEF ||
455 cast<ConstantSDNode>(Op)->getValue() == Val;
458 /// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
459 /// VPKUHUM instruction.
460 bool PPC::isVPKUHUMShuffleMask(SDNode *N, bool isUnary) {
462 for (unsigned i = 0; i != 16; ++i)
463 if (!isConstantOrUndef(N->getOperand(i), i*2+1))
466 for (unsigned i = 0; i != 8; ++i)
467 if (!isConstantOrUndef(N->getOperand(i), i*2+1) ||
468 !isConstantOrUndef(N->getOperand(i+8), i*2+1))
474 /// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
475 /// VPKUWUM instruction.
476 bool PPC::isVPKUWUMShuffleMask(SDNode *N, bool isUnary) {
478 for (unsigned i = 0; i != 16; i += 2)
479 if (!isConstantOrUndef(N->getOperand(i ), i*2+2) ||
480 !isConstantOrUndef(N->getOperand(i+1), i*2+3))
483 for (unsigned i = 0; i != 8; i += 2)
484 if (!isConstantOrUndef(N->getOperand(i ), i*2+2) ||
485 !isConstantOrUndef(N->getOperand(i+1), i*2+3) ||
486 !isConstantOrUndef(N->getOperand(i+8), i*2+2) ||
487 !isConstantOrUndef(N->getOperand(i+9), i*2+3))
493 /// isVMerge - Common function, used to match vmrg* shuffles.
495 static bool isVMerge(SDNode *N, unsigned UnitSize,
496 unsigned LHSStart, unsigned RHSStart) {
497 assert(N->getOpcode() == ISD::BUILD_VECTOR &&
498 N->getNumOperands() == 16 && "PPC only supports shuffles by bytes!");
499 assert((UnitSize == 1 || UnitSize == 2 || UnitSize == 4) &&
500 "Unsupported merge size!");
502 for (unsigned i = 0; i != 8/UnitSize; ++i) // Step over units
503 for (unsigned j = 0; j != UnitSize; ++j) { // Step over bytes within unit
504 if (!isConstantOrUndef(N->getOperand(i*UnitSize*2+j),
505 LHSStart+j+i*UnitSize) ||
506 !isConstantOrUndef(N->getOperand(i*UnitSize*2+UnitSize+j),
507 RHSStart+j+i*UnitSize))
513 /// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
514 /// a VRGL* instruction with the specified unit size (1,2 or 4 bytes).
515 bool PPC::isVMRGLShuffleMask(SDNode *N, unsigned UnitSize, bool isUnary) {
517 return isVMerge(N, UnitSize, 8, 24);
518 return isVMerge(N, UnitSize, 8, 8);
521 /// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
522 /// a VRGH* instruction with the specified unit size (1,2 or 4 bytes).
523 bool PPC::isVMRGHShuffleMask(SDNode *N, unsigned UnitSize, bool isUnary) {
525 return isVMerge(N, UnitSize, 0, 16);
526 return isVMerge(N, UnitSize, 0, 0);
530 /// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift
531 /// amount, otherwise return -1.
532 int PPC::isVSLDOIShuffleMask(SDNode *N, bool isUnary) {
533 assert(N->getOpcode() == ISD::BUILD_VECTOR &&
534 N->getNumOperands() == 16 && "PPC only supports shuffles by bytes!");
535 // Find the first non-undef value in the shuffle mask.
537 for (i = 0; i != 16 && N->getOperand(i).getOpcode() == ISD::UNDEF; ++i)
540 if (i == 16) return -1; // all undef.
542 // Otherwise, check to see if the rest of the elements are consequtively
543 // numbered from this value.
544 unsigned ShiftAmt = cast<ConstantSDNode>(N->getOperand(i))->getValue();
545 if (ShiftAmt < i) return -1;
549 // Check the rest of the elements to see if they are consequtive.
550 for (++i; i != 16; ++i)
551 if (!isConstantOrUndef(N->getOperand(i), ShiftAmt+i))
554 // Check the rest of the elements to see if they are consequtive.
555 for (++i; i != 16; ++i)
556 if (!isConstantOrUndef(N->getOperand(i), (ShiftAmt+i) & 15))
563 /// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
564 /// specifies a splat of a single element that is suitable for input to
565 /// VSPLTB/VSPLTH/VSPLTW.
566 bool PPC::isSplatShuffleMask(SDNode *N, unsigned EltSize) {
567 assert(N->getOpcode() == ISD::BUILD_VECTOR &&
568 N->getNumOperands() == 16 &&
569 (EltSize == 1 || EltSize == 2 || EltSize == 4));
571 // This is a splat operation if each element of the permute is the same, and
572 // if the value doesn't reference the second vector.
573 unsigned ElementBase = 0;
574 SDValue Elt = N->getOperand(0);
575 if (ConstantSDNode *EltV = dyn_cast<ConstantSDNode>(Elt))
576 ElementBase = EltV->getValue();
578 return false; // FIXME: Handle UNDEF elements too!
580 if (cast<ConstantSDNode>(Elt)->getValue() >= 16)
583 // Check that they are consequtive.
584 for (unsigned i = 1; i != EltSize; ++i) {
585 if (!isa<ConstantSDNode>(N->getOperand(i)) ||
586 cast<ConstantSDNode>(N->getOperand(i))->getValue() != i+ElementBase)
590 assert(isa<ConstantSDNode>(Elt) && "Invalid VECTOR_SHUFFLE mask!");
591 for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
592 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
593 assert(isa<ConstantSDNode>(N->getOperand(i)) &&
594 "Invalid VECTOR_SHUFFLE mask!");
595 for (unsigned j = 0; j != EltSize; ++j)
596 if (N->getOperand(i+j) != N->getOperand(j))
603 /// isAllNegativeZeroVector - Returns true if all elements of build_vector
605 bool PPC::isAllNegativeZeroVector(SDNode *N) {
606 assert(N->getOpcode() == ISD::BUILD_VECTOR);
607 if (PPC::isSplatShuffleMask(N, N->getNumOperands()))
608 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N))
609 return CFP->getValueAPF().isNegZero();
613 /// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
614 /// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
615 unsigned PPC::getVSPLTImmediate(SDNode *N, unsigned EltSize) {
616 assert(isSplatShuffleMask(N, EltSize));
617 return cast<ConstantSDNode>(N->getOperand(0))->getValue() / EltSize;
620 /// get_VSPLTI_elt - If this is a build_vector of constants which can be formed
621 /// by using a vspltis[bhw] instruction of the specified element size, return
622 /// the constant being splatted. The ByteSize field indicates the number of
623 /// bytes of each element [124] -> [bhw].
624 SDValue PPC::get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
627 // If ByteSize of the splat is bigger than the element size of the
628 // build_vector, then we have a case where we are checking for a splat where
629 // multiple elements of the buildvector are folded together into a single
630 // logical element of the splat (e.g. "vsplish 1" to splat {0,1}*8).
631 unsigned EltSize = 16/N->getNumOperands();
632 if (EltSize < ByteSize) {
633 unsigned Multiple = ByteSize/EltSize; // Number of BV entries per spltval.
634 SDValue UniquedVals[4];
635 assert(Multiple > 1 && Multiple <= 4 && "How can this happen?");
637 // See if all of the elements in the buildvector agree across.
638 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
639 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
640 // If the element isn't a constant, bail fully out.
641 if (!isa<ConstantSDNode>(N->getOperand(i))) return SDValue();
644 if (UniquedVals[i&(Multiple-1)].getNode() == 0)
645 UniquedVals[i&(Multiple-1)] = N->getOperand(i);
646 else if (UniquedVals[i&(Multiple-1)] != N->getOperand(i))
647 return SDValue(); // no match.
650 // Okay, if we reached this point, UniquedVals[0..Multiple-1] contains
651 // either constant or undef values that are identical for each chunk. See
652 // if these chunks can form into a larger vspltis*.
654 // Check to see if all of the leading entries are either 0 or -1. If
655 // neither, then this won't fit into the immediate field.
656 bool LeadingZero = true;
657 bool LeadingOnes = true;
658 for (unsigned i = 0; i != Multiple-1; ++i) {
659 if (UniquedVals[i].getNode() == 0) continue; // Must have been undefs.
661 LeadingZero &= cast<ConstantSDNode>(UniquedVals[i])->isNullValue();
662 LeadingOnes &= cast<ConstantSDNode>(UniquedVals[i])->isAllOnesValue();
664 // Finally, check the least significant entry.
666 if (UniquedVals[Multiple-1].getNode() == 0)
667 return DAG.getTargetConstant(0, MVT::i32); // 0,0,0,undef
668 int Val = cast<ConstantSDNode>(UniquedVals[Multiple-1])->getValue();
670 return DAG.getTargetConstant(Val, MVT::i32); // 0,0,0,4 -> vspltisw(4)
673 if (UniquedVals[Multiple-1].getNode() == 0)
674 return DAG.getTargetConstant(~0U, MVT::i32); // -1,-1,-1,undef
675 int Val =cast<ConstantSDNode>(UniquedVals[Multiple-1])->getSignExtended();
676 if (Val >= -16) // -1,-1,-1,-2 -> vspltisw(-2)
677 return DAG.getTargetConstant(Val, MVT::i32);
683 // Check to see if this buildvec has a single non-undef value in its elements.
684 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
685 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
686 if (OpVal.getNode() == 0)
687 OpVal = N->getOperand(i);
688 else if (OpVal != N->getOperand(i))
692 if (OpVal.getNode() == 0) return SDValue(); // All UNDEF: use implicit def.
694 unsigned ValSizeInBytes = 0;
696 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
697 Value = CN->getValue();
698 ValSizeInBytes = CN->getValueType(0).getSizeInBits()/8;
699 } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
700 assert(CN->getValueType(0) == MVT::f32 && "Only one legal FP vector type!");
701 Value = FloatToBits(CN->getValueAPF().convertToFloat());
705 // If the splat value is larger than the element value, then we can never do
706 // this splat. The only case that we could fit the replicated bits into our
707 // immediate field for would be zero, and we prefer to use vxor for it.
708 if (ValSizeInBytes < ByteSize) return SDValue();
710 // If the element value is larger than the splat value, cut it in half and
711 // check to see if the two halves are equal. Continue doing this until we
712 // get to ByteSize. This allows us to handle 0x01010101 as 0x01.
713 while (ValSizeInBytes > ByteSize) {
714 ValSizeInBytes >>= 1;
716 // If the top half equals the bottom half, we're still ok.
717 if (((Value >> (ValSizeInBytes*8)) & ((1 << (8*ValSizeInBytes))-1)) !=
718 (Value & ((1 << (8*ValSizeInBytes))-1)))
722 // Properly sign extend the value.
723 int ShAmt = (4-ByteSize)*8;
724 int MaskVal = ((int)Value << ShAmt) >> ShAmt;
726 // If this is zero, don't match, zero matches ISD::isBuildVectorAllZeros.
727 if (MaskVal == 0) return SDValue();
729 // Finally, if this value fits in a 5 bit sext field, return it
730 if (((MaskVal << (32-5)) >> (32-5)) == MaskVal)
731 return DAG.getTargetConstant(MaskVal, MVT::i32);
735 //===----------------------------------------------------------------------===//
736 // Addressing Mode Selection
737 //===----------------------------------------------------------------------===//
739 /// isIntS16Immediate - This method tests to see if the node is either a 32-bit
740 /// or 64-bit immediate, and if the value can be accurately represented as a
741 /// sign extension from a 16-bit value. If so, this returns true and the
743 static bool isIntS16Immediate(SDNode *N, short &Imm) {
744 if (N->getOpcode() != ISD::Constant)
747 Imm = (short)cast<ConstantSDNode>(N)->getValue();
748 if (N->getValueType(0) == MVT::i32)
749 return Imm == (int32_t)cast<ConstantSDNode>(N)->getValue();
751 return Imm == (int64_t)cast<ConstantSDNode>(N)->getValue();
753 static bool isIntS16Immediate(SDValue Op, short &Imm) {
754 return isIntS16Immediate(Op.getNode(), Imm);
758 /// SelectAddressRegReg - Given the specified addressed, check to see if it
759 /// can be represented as an indexed [r+r] operation. Returns false if it
760 /// can be more efficiently represented with [r+imm].
761 bool PPCTargetLowering::SelectAddressRegReg(SDValue N, SDValue &Base,
765 if (N.getOpcode() == ISD::ADD) {
766 if (isIntS16Immediate(N.getOperand(1), imm))
768 if (N.getOperand(1).getOpcode() == PPCISD::Lo)
771 Base = N.getOperand(0);
772 Index = N.getOperand(1);
774 } else if (N.getOpcode() == ISD::OR) {
775 if (isIntS16Immediate(N.getOperand(1), imm))
776 return false; // r+i can fold it if we can.
778 // If this is an or of disjoint bitfields, we can codegen this as an add
779 // (for better address arithmetic) if the LHS and RHS of the OR are provably
781 APInt LHSKnownZero, LHSKnownOne;
782 APInt RHSKnownZero, RHSKnownOne;
783 DAG.ComputeMaskedBits(N.getOperand(0),
784 APInt::getAllOnesValue(N.getOperand(0)
785 .getValueSizeInBits()),
786 LHSKnownZero, LHSKnownOne);
788 if (LHSKnownZero.getBoolValue()) {
789 DAG.ComputeMaskedBits(N.getOperand(1),
790 APInt::getAllOnesValue(N.getOperand(1)
791 .getValueSizeInBits()),
792 RHSKnownZero, RHSKnownOne);
793 // If all of the bits are known zero on the LHS or RHS, the add won't
795 if (~(LHSKnownZero | RHSKnownZero) == 0) {
796 Base = N.getOperand(0);
797 Index = N.getOperand(1);
806 /// Returns true if the address N can be represented by a base register plus
807 /// a signed 16-bit displacement [r+imm], and if it is not better
808 /// represented as reg+reg.
809 bool PPCTargetLowering::SelectAddressRegImm(SDValue N, SDValue &Disp,
810 SDValue &Base, SelectionDAG &DAG){
811 // If this can be more profitably realized as r+r, fail.
812 if (SelectAddressRegReg(N, Disp, Base, DAG))
815 if (N.getOpcode() == ISD::ADD) {
817 if (isIntS16Immediate(N.getOperand(1), imm)) {
818 Disp = DAG.getTargetConstant((int)imm & 0xFFFF, MVT::i32);
819 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
820 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
822 Base = N.getOperand(0);
824 return true; // [r+i]
825 } else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
826 // Match LOAD (ADD (X, Lo(G))).
827 assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getValue()
828 && "Cannot handle constant offsets yet!");
829 Disp = N.getOperand(1).getOperand(0); // The global address.
830 assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
831 Disp.getOpcode() == ISD::TargetConstantPool ||
832 Disp.getOpcode() == ISD::TargetJumpTable);
833 Base = N.getOperand(0);
834 return true; // [&g+r]
836 } else if (N.getOpcode() == ISD::OR) {
838 if (isIntS16Immediate(N.getOperand(1), imm)) {
839 // If this is an or of disjoint bitfields, we can codegen this as an add
840 // (for better address arithmetic) if the LHS and RHS of the OR are
841 // provably disjoint.
842 APInt LHSKnownZero, LHSKnownOne;
843 DAG.ComputeMaskedBits(N.getOperand(0),
844 APInt::getAllOnesValue(N.getOperand(0)
845 .getValueSizeInBits()),
846 LHSKnownZero, LHSKnownOne);
848 if ((LHSKnownZero.getZExtValue()|~(uint64_t)imm) == ~0ULL) {
849 // If all of the bits are known zero on the LHS or RHS, the add won't
851 Base = N.getOperand(0);
852 Disp = DAG.getTargetConstant((int)imm & 0xFFFF, MVT::i32);
856 } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
857 // Loading from a constant address.
859 // If this address fits entirely in a 16-bit sext immediate field, codegen
862 if (isIntS16Immediate(CN, Imm)) {
863 Disp = DAG.getTargetConstant(Imm, CN->getValueType(0));
864 Base = DAG.getRegister(PPC::R0, CN->getValueType(0));
868 // Handle 32-bit sext immediates with LIS + addr mode.
869 if (CN->getValueType(0) == MVT::i32 ||
870 (int64_t)CN->getValue() == (int)CN->getValue()) {
871 int Addr = (int)CN->getValue();
873 // Otherwise, break this down into an LIS + disp.
874 Disp = DAG.getTargetConstant((short)Addr, MVT::i32);
876 Base = DAG.getTargetConstant((Addr - (signed short)Addr) >> 16, MVT::i32);
877 unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
878 Base = SDValue(DAG.getTargetNode(Opc, CN->getValueType(0), Base), 0);
883 Disp = DAG.getTargetConstant(0, getPointerTy());
884 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
885 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
888 return true; // [r+0]
891 /// SelectAddressRegRegOnly - Given the specified addressed, force it to be
892 /// represented as an indexed [r+r] operation.
893 bool PPCTargetLowering::SelectAddressRegRegOnly(SDValue N, SDValue &Base,
896 // Check to see if we can easily represent this as an [r+r] address. This
897 // will fail if it thinks that the address is more profitably represented as
898 // reg+imm, e.g. where imm = 0.
899 if (SelectAddressRegReg(N, Base, Index, DAG))
902 // If the operand is an addition, always emit this as [r+r], since this is
903 // better (for code size, and execution, as the memop does the add for free)
904 // than emitting an explicit add.
905 if (N.getOpcode() == ISD::ADD) {
906 Base = N.getOperand(0);
907 Index = N.getOperand(1);
911 // Otherwise, do it the hard way, using R0 as the base register.
912 Base = DAG.getRegister(PPC::R0, N.getValueType());
917 /// SelectAddressRegImmShift - Returns true if the address N can be
918 /// represented by a base register plus a signed 14-bit displacement
919 /// [r+imm*4]. Suitable for use by STD and friends.
920 bool PPCTargetLowering::SelectAddressRegImmShift(SDValue N, SDValue &Disp,
923 // If this can be more profitably realized as r+r, fail.
924 if (SelectAddressRegReg(N, Disp, Base, DAG))
927 if (N.getOpcode() == ISD::ADD) {
929 if (isIntS16Immediate(N.getOperand(1), imm) && (imm & 3) == 0) {
930 Disp = DAG.getTargetConstant(((int)imm & 0xFFFF) >> 2, MVT::i32);
931 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
932 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
934 Base = N.getOperand(0);
936 return true; // [r+i]
937 } else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
938 // Match LOAD (ADD (X, Lo(G))).
939 assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getValue()
940 && "Cannot handle constant offsets yet!");
941 Disp = N.getOperand(1).getOperand(0); // The global address.
942 assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
943 Disp.getOpcode() == ISD::TargetConstantPool ||
944 Disp.getOpcode() == ISD::TargetJumpTable);
945 Base = N.getOperand(0);
946 return true; // [&g+r]
948 } else if (N.getOpcode() == ISD::OR) {
950 if (isIntS16Immediate(N.getOperand(1), imm) && (imm & 3) == 0) {
951 // If this is an or of disjoint bitfields, we can codegen this as an add
952 // (for better address arithmetic) if the LHS and RHS of the OR are
953 // provably disjoint.
954 APInt LHSKnownZero, LHSKnownOne;
955 DAG.ComputeMaskedBits(N.getOperand(0),
956 APInt::getAllOnesValue(N.getOperand(0)
957 .getValueSizeInBits()),
958 LHSKnownZero, LHSKnownOne);
959 if ((LHSKnownZero.getZExtValue()|~(uint64_t)imm) == ~0ULL) {
960 // If all of the bits are known zero on the LHS or RHS, the add won't
962 Base = N.getOperand(0);
963 Disp = DAG.getTargetConstant(((int)imm & 0xFFFF) >> 2, MVT::i32);
967 } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
968 // Loading from a constant address. Verify low two bits are clear.
969 if ((CN->getValue() & 3) == 0) {
970 // If this address fits entirely in a 14-bit sext immediate field, codegen
973 if (isIntS16Immediate(CN, Imm)) {
974 Disp = DAG.getTargetConstant((unsigned short)Imm >> 2, getPointerTy());
975 Base = DAG.getRegister(PPC::R0, CN->getValueType(0));
979 // Fold the low-part of 32-bit absolute addresses into addr mode.
980 if (CN->getValueType(0) == MVT::i32 ||
981 (int64_t)CN->getValue() == (int)CN->getValue()) {
982 int Addr = (int)CN->getValue();
984 // Otherwise, break this down into an LIS + disp.
985 Disp = DAG.getTargetConstant((short)Addr >> 2, MVT::i32);
987 Base = DAG.getTargetConstant((Addr-(signed short)Addr) >> 16, MVT::i32);
988 unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
989 Base = SDValue(DAG.getTargetNode(Opc, CN->getValueType(0), Base), 0);
995 Disp = DAG.getTargetConstant(0, getPointerTy());
996 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
997 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
1000 return true; // [r+0]
1004 /// getPreIndexedAddressParts - returns true by value, base pointer and
1005 /// offset pointer and addressing mode by reference if the node's address
1006 /// can be legally represented as pre-indexed load / store address.
1007 bool PPCTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
1009 ISD::MemIndexedMode &AM,
1010 SelectionDAG &DAG) {
1011 // Disabled by default for now.
1012 if (!EnablePPCPreinc) return false;
1016 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1017 Ptr = LD->getBasePtr();
1018 VT = LD->getMemoryVT();
1020 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
1022 Ptr = ST->getBasePtr();
1023 VT = ST->getMemoryVT();
1027 // PowerPC doesn't have preinc load/store instructions for vectors.
1031 // TODO: Check reg+reg first.
1033 // LDU/STU use reg+imm*4, others use reg+imm.
1034 if (VT != MVT::i64) {
1036 if (!SelectAddressRegImm(Ptr, Offset, Base, DAG))
1040 if (!SelectAddressRegImmShift(Ptr, Offset, Base, DAG))
1044 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
1045 // PPC64 doesn't have lwau, but it does have lwaux. Reject preinc load of
1046 // sext i32 to i64 when addr mode is r+i.
1047 if (LD->getValueType(0) == MVT::i64 && LD->getMemoryVT() == MVT::i32 &&
1048 LD->getExtensionType() == ISD::SEXTLOAD &&
1049 isa<ConstantSDNode>(Offset))
1057 //===----------------------------------------------------------------------===//
1058 // LowerOperation implementation
1059 //===----------------------------------------------------------------------===//
1061 SDValue PPCTargetLowering::LowerConstantPool(SDValue Op,
1062 SelectionDAG &DAG) {
1063 MVT PtrVT = Op.getValueType();
1064 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
1065 Constant *C = CP->getConstVal();
1066 SDValue CPI = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment());
1067 SDValue Zero = DAG.getConstant(0, PtrVT);
1069 const TargetMachine &TM = DAG.getTarget();
1071 SDValue Hi = DAG.getNode(PPCISD::Hi, PtrVT, CPI, Zero);
1072 SDValue Lo = DAG.getNode(PPCISD::Lo, PtrVT, CPI, Zero);
1074 // If this is a non-darwin platform, we don't support non-static relo models
1076 if (TM.getRelocationModel() == Reloc::Static ||
1077 !TM.getSubtarget<PPCSubtarget>().isDarwin()) {
1078 // Generate non-pic code that has direct accesses to the constant pool.
1079 // The address of the global is just (hi(&g)+lo(&g)).
1080 return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1083 if (TM.getRelocationModel() == Reloc::PIC_) {
1084 // With PIC, the first instruction is actually "GR+hi(&G)".
1085 Hi = DAG.getNode(ISD::ADD, PtrVT,
1086 DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
1089 Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1093 SDValue PPCTargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) {
1094 MVT PtrVT = Op.getValueType();
1095 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
1096 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
1097 SDValue Zero = DAG.getConstant(0, PtrVT);
1099 const TargetMachine &TM = DAG.getTarget();
1101 SDValue Hi = DAG.getNode(PPCISD::Hi, PtrVT, JTI, Zero);
1102 SDValue Lo = DAG.getNode(PPCISD::Lo, PtrVT, JTI, Zero);
1104 // If this is a non-darwin platform, we don't support non-static relo models
1106 if (TM.getRelocationModel() == Reloc::Static ||
1107 !TM.getSubtarget<PPCSubtarget>().isDarwin()) {
1108 // Generate non-pic code that has direct accesses to the constant pool.
1109 // The address of the global is just (hi(&g)+lo(&g)).
1110 return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1113 if (TM.getRelocationModel() == Reloc::PIC_) {
1114 // With PIC, the first instruction is actually "GR+hi(&G)".
1115 Hi = DAG.getNode(ISD::ADD, PtrVT,
1116 DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
1119 Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1123 SDValue PPCTargetLowering::LowerGlobalTLSAddress(SDValue Op,
1124 SelectionDAG &DAG) {
1125 assert(0 && "TLS not implemented for PPC.");
1126 return SDValue(); // Not reached
1129 SDValue PPCTargetLowering::LowerGlobalAddress(SDValue Op,
1130 SelectionDAG &DAG) {
1131 MVT PtrVT = Op.getValueType();
1132 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
1133 GlobalValue *GV = GSDN->getGlobal();
1134 SDValue GA = DAG.getTargetGlobalAddress(GV, PtrVT, GSDN->getOffset());
1135 // If it's a debug information descriptor, don't mess with it.
1136 if (DAG.isVerifiedDebugInfoDesc(Op))
1138 SDValue Zero = DAG.getConstant(0, PtrVT);
1140 const TargetMachine &TM = DAG.getTarget();
1142 SDValue Hi = DAG.getNode(PPCISD::Hi, PtrVT, GA, Zero);
1143 SDValue Lo = DAG.getNode(PPCISD::Lo, PtrVT, GA, Zero);
1145 // If this is a non-darwin platform, we don't support non-static relo models
1147 if (TM.getRelocationModel() == Reloc::Static ||
1148 !TM.getSubtarget<PPCSubtarget>().isDarwin()) {
1149 // Generate non-pic code that has direct accesses to globals.
1150 // The address of the global is just (hi(&g)+lo(&g)).
1151 return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1154 if (TM.getRelocationModel() == Reloc::PIC_) {
1155 // With PIC, the first instruction is actually "GR+hi(&G)".
1156 Hi = DAG.getNode(ISD::ADD, PtrVT,
1157 DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
1160 Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1162 if (!TM.getSubtarget<PPCSubtarget>().hasLazyResolverStub(GV))
1165 // If the global is weak or external, we have to go through the lazy
1167 return DAG.getLoad(PtrVT, DAG.getEntryNode(), Lo, NULL, 0);
1170 SDValue PPCTargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) {
1171 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
1173 // If we're comparing for equality to zero, expose the fact that this is
1174 // implented as a ctlz/srl pair on ppc, so that the dag combiner can
1175 // fold the new nodes.
1176 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1177 if (C->isNullValue() && CC == ISD::SETEQ) {
1178 MVT VT = Op.getOperand(0).getValueType();
1179 SDValue Zext = Op.getOperand(0);
1180 if (VT.bitsLT(MVT::i32)) {
1182 Zext = DAG.getNode(ISD::ZERO_EXTEND, VT, Op.getOperand(0));
1184 unsigned Log2b = Log2_32(VT.getSizeInBits());
1185 SDValue Clz = DAG.getNode(ISD::CTLZ, VT, Zext);
1186 SDValue Scc = DAG.getNode(ISD::SRL, VT, Clz,
1187 DAG.getConstant(Log2b, MVT::i32));
1188 return DAG.getNode(ISD::TRUNCATE, MVT::i32, Scc);
1190 // Leave comparisons against 0 and -1 alone for now, since they're usually
1191 // optimized. FIXME: revisit this when we can custom lower all setcc
1193 if (C->isAllOnesValue() || C->isNullValue())
1197 // If we have an integer seteq/setne, turn it into a compare against zero
1198 // by xor'ing the rhs with the lhs, which is faster than setting a
1199 // condition register, reading it back out, and masking the correct bit. The
1200 // normal approach here uses sub to do this instead of xor. Using xor exposes
1201 // the result to other bit-twiddling opportunities.
1202 MVT LHSVT = Op.getOperand(0).getValueType();
1203 if (LHSVT.isInteger() && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
1204 MVT VT = Op.getValueType();
1205 SDValue Sub = DAG.getNode(ISD::XOR, LHSVT, Op.getOperand(0),
1207 return DAG.getSetCC(VT, Sub, DAG.getConstant(0, LHSVT), CC);
1212 SDValue PPCTargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG,
1213 int VarArgsFrameIndex,
1214 int VarArgsStackOffset,
1215 unsigned VarArgsNumGPR,
1216 unsigned VarArgsNumFPR,
1217 const PPCSubtarget &Subtarget) {
1219 assert(0 && "VAARG in ELF32 ABI not implemented yet!");
1220 return SDValue(); // Not reached
1223 SDValue PPCTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG,
1224 int VarArgsFrameIndex,
1225 int VarArgsStackOffset,
1226 unsigned VarArgsNumGPR,
1227 unsigned VarArgsNumFPR,
1228 const PPCSubtarget &Subtarget) {
1230 if (Subtarget.isMachoABI()) {
1231 // vastart just stores the address of the VarArgsFrameIndex slot into the
1232 // memory location argument.
1233 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1234 SDValue FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1235 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1236 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV, 0);
1239 // For ELF 32 ABI we follow the layout of the va_list struct.
1240 // We suppose the given va_list is already allocated.
1243 // char gpr; /* index into the array of 8 GPRs
1244 // * stored in the register save area
1245 // * gpr=0 corresponds to r3,
1246 // * gpr=1 to r4, etc.
1248 // char fpr; /* index into the array of 8 FPRs
1249 // * stored in the register save area
1250 // * fpr=0 corresponds to f1,
1251 // * fpr=1 to f2, etc.
1253 // char *overflow_arg_area;
1254 // /* location on stack that holds
1255 // * the next overflow argument
1257 // char *reg_save_area;
1258 // /* where r3:r10 and f1:f8 (if saved)
1264 SDValue ArgGPR = DAG.getConstant(VarArgsNumGPR, MVT::i8);
1265 SDValue ArgFPR = DAG.getConstant(VarArgsNumFPR, MVT::i8);
1268 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1270 SDValue StackOffsetFI = DAG.getFrameIndex(VarArgsStackOffset, PtrVT);
1271 SDValue FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1273 uint64_t FrameOffset = PtrVT.getSizeInBits()/8;
1274 SDValue ConstFrameOffset = DAG.getConstant(FrameOffset, PtrVT);
1276 uint64_t StackOffset = PtrVT.getSizeInBits()/8 - 1;
1277 SDValue ConstStackOffset = DAG.getConstant(StackOffset, PtrVT);
1279 uint64_t FPROffset = 1;
1280 SDValue ConstFPROffset = DAG.getConstant(FPROffset, PtrVT);
1282 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1284 // Store first byte : number of int regs
1285 SDValue firstStore = DAG.getStore(Op.getOperand(0), ArgGPR,
1286 Op.getOperand(1), SV, 0);
1287 uint64_t nextOffset = FPROffset;
1288 SDValue nextPtr = DAG.getNode(ISD::ADD, PtrVT, Op.getOperand(1),
1291 // Store second byte : number of float regs
1292 SDValue secondStore =
1293 DAG.getStore(firstStore, ArgFPR, nextPtr, SV, nextOffset);
1294 nextOffset += StackOffset;
1295 nextPtr = DAG.getNode(ISD::ADD, PtrVT, nextPtr, ConstStackOffset);
1297 // Store second word : arguments given on stack
1298 SDValue thirdStore =
1299 DAG.getStore(secondStore, StackOffsetFI, nextPtr, SV, nextOffset);
1300 nextOffset += FrameOffset;
1301 nextPtr = DAG.getNode(ISD::ADD, PtrVT, nextPtr, ConstFrameOffset);
1303 // Store third word : arguments given in registers
1304 return DAG.getStore(thirdStore, FR, nextPtr, SV, nextOffset);
1308 #include "PPCGenCallingConv.inc"
1310 /// GetFPR - Get the set of FP registers that should be allocated for arguments,
1311 /// depending on which subtarget is selected.
1312 static const unsigned *GetFPR(const PPCSubtarget &Subtarget) {
1313 if (Subtarget.isMachoABI()) {
1314 static const unsigned FPR[] = {
1315 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
1316 PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
1322 static const unsigned FPR[] = {
1323 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
1329 /// CalculateStackSlotSize - Calculates the size reserved for this argument on
1331 static unsigned CalculateStackSlotSize(SDValue Arg, SDValue Flag,
1332 bool isVarArg, unsigned PtrByteSize) {
1333 MVT ArgVT = Arg.getValueType();
1334 ISD::ArgFlagsTy Flags = cast<ARG_FLAGSSDNode>(Flag)->getArgFlags();
1335 unsigned ArgSize =ArgVT.getSizeInBits()/8;
1336 if (Flags.isByVal())
1337 ArgSize = Flags.getByValSize();
1338 ArgSize = ((ArgSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
1344 PPCTargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op,
1346 int &VarArgsFrameIndex,
1347 int &VarArgsStackOffset,
1348 unsigned &VarArgsNumGPR,
1349 unsigned &VarArgsNumFPR,
1350 const PPCSubtarget &Subtarget) {
1351 // TODO: add description of PPC stack frame format, or at least some docs.
1353 MachineFunction &MF = DAG.getMachineFunction();
1354 MachineFrameInfo *MFI = MF.getFrameInfo();
1355 MachineRegisterInfo &RegInfo = MF.getRegInfo();
1356 SmallVector<SDValue, 8> ArgValues;
1357 SDValue Root = Op.getOperand(0);
1358 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
1360 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1361 bool isPPC64 = PtrVT == MVT::i64;
1362 bool isMachoABI = Subtarget.isMachoABI();
1363 bool isELF32_ABI = Subtarget.isELF32_ABI();
1364 // Potential tail calls could cause overwriting of argument stack slots.
1365 unsigned CC = MF.getFunction()->getCallingConv();
1366 bool isImmutable = !(PerformTailCallOpt && (CC==CallingConv::Fast));
1367 unsigned PtrByteSize = isPPC64 ? 8 : 4;
1369 unsigned ArgOffset = PPCFrameInfo::getLinkageSize(isPPC64, isMachoABI);
1370 // Area that is at least reserved in caller of this function.
1371 unsigned MinReservedArea = ArgOffset;
1373 static const unsigned GPR_32[] = { // 32-bit registers.
1374 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
1375 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
1377 static const unsigned GPR_64[] = { // 64-bit registers.
1378 PPC::X3, PPC::X4, PPC::X5, PPC::X6,
1379 PPC::X7, PPC::X8, PPC::X9, PPC::X10,
1382 static const unsigned *FPR = GetFPR(Subtarget);
1384 static const unsigned VR[] = {
1385 PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
1386 PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
1389 const unsigned Num_GPR_Regs = array_lengthof(GPR_32);
1390 const unsigned Num_FPR_Regs = isMachoABI ? 13 : 8;
1391 const unsigned Num_VR_Regs = array_lengthof( VR);
1393 unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
1395 const unsigned *GPR = isPPC64 ? GPR_64 : GPR_32;
1397 // In 32-bit non-varargs functions, the stack space for vectors is after the
1398 // stack space for non-vectors. We do not use this space unless we have
1399 // too many vectors to fit in registers, something that only occurs in
1400 // constructed examples:), but we have to walk the arglist to figure
1401 // that out...for the pathological case, compute VecArgOffset as the
1402 // start of the vector parameter area. Computing VecArgOffset is the
1403 // entire point of the following loop.
1404 // Altivec is not mentioned in the ppc32 Elf Supplement, so I'm not trying
1405 // to handle Elf here.
1406 unsigned VecArgOffset = ArgOffset;
1407 if (!isVarArg && !isPPC64) {
1408 for (unsigned ArgNo = 0, e = Op.getNode()->getNumValues()-1; ArgNo != e;
1410 MVT ObjectVT = Op.getValue(ArgNo).getValueType();
1411 unsigned ObjSize = ObjectVT.getSizeInBits()/8;
1412 ISD::ArgFlagsTy Flags =
1413 cast<ARG_FLAGSSDNode>(Op.getOperand(ArgNo+3))->getArgFlags();
1415 if (Flags.isByVal()) {
1416 // ObjSize is the true size, ArgSize rounded up to multiple of regs.
1417 ObjSize = Flags.getByValSize();
1419 ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
1420 VecArgOffset += ArgSize;
1424 switch(ObjectVT.getSimpleVT()) {
1425 default: assert(0 && "Unhandled argument type!");
1428 VecArgOffset += isPPC64 ? 8 : 4;
1430 case MVT::i64: // PPC64
1438 // Nothing to do, we're only looking at Nonvector args here.
1443 // We've found where the vector parameter area in memory is. Skip the
1444 // first 12 parameters; these don't use that memory.
1445 VecArgOffset = ((VecArgOffset+15)/16)*16;
1446 VecArgOffset += 12*16;
1448 // Add DAG nodes to load the arguments or copy them out of registers. On
1449 // entry to a function on PPC, the arguments start after the linkage area,
1450 // although the first ones are often in registers.
1452 // In the ELF 32 ABI, GPRs and stack are double word align: an argument
1453 // represented with two words (long long or double) must be copied to an
1454 // even GPR_idx value or to an even ArgOffset value.
1456 SmallVector<SDValue, 8> MemOps;
1457 unsigned nAltivecParamsAtEnd = 0;
1458 for (unsigned ArgNo = 0, e = Op.getNode()->getNumValues() - 1;
1459 ArgNo != e; ++ArgNo) {
1461 bool needsLoad = false;
1462 MVT ObjectVT = Op.getValue(ArgNo).getValueType();
1463 unsigned ObjSize = ObjectVT.getSizeInBits()/8;
1464 unsigned ArgSize = ObjSize;
1465 ISD::ArgFlagsTy Flags =
1466 cast<ARG_FLAGSSDNode>(Op.getOperand(ArgNo+3))->getArgFlags();
1467 // See if next argument requires stack alignment in ELF
1468 bool Align = Flags.isSplit();
1470 unsigned CurArgOffset = ArgOffset;
1472 // Varargs or 64 bit Altivec parameters are padded to a 16 byte boundary.
1473 if (ObjectVT==MVT::v4f32 || ObjectVT==MVT::v4i32 ||
1474 ObjectVT==MVT::v8i16 || ObjectVT==MVT::v16i8) {
1475 if (isVarArg || isPPC64) {
1476 MinReservedArea = ((MinReservedArea+15)/16)*16;
1477 MinReservedArea += CalculateStackSlotSize(Op.getValue(ArgNo),
1478 Op.getOperand(ArgNo+3),
1481 } else nAltivecParamsAtEnd++;
1483 // Calculate min reserved area.
1484 MinReservedArea += CalculateStackSlotSize(Op.getValue(ArgNo),
1485 Op.getOperand(ArgNo+3),
1489 // FIXME alignment for ELF may not be right
1490 // FIXME the codegen can be much improved in some cases.
1491 // We do not have to keep everything in memory.
1492 if (Flags.isByVal()) {
1493 // ObjSize is the true size, ArgSize rounded up to multiple of registers.
1494 ObjSize = Flags.getByValSize();
1495 ArgSize = ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
1496 // Double word align in ELF
1497 if (Align && isELF32_ABI) GPR_idx += (GPR_idx % 2);
1498 // Objects of size 1 and 2 are right justified, everything else is
1499 // left justified. This means the memory address is adjusted forwards.
1500 if (ObjSize==1 || ObjSize==2) {
1501 CurArgOffset = CurArgOffset + (4 - ObjSize);
1503 // The value of the object is its address.
1504 int FI = MFI->CreateFixedObject(ObjSize, CurArgOffset);
1505 SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
1506 ArgValues.push_back(FIN);
1507 if (ObjSize==1 || ObjSize==2) {
1508 if (GPR_idx != Num_GPR_Regs) {
1509 unsigned VReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass);
1510 RegInfo.addLiveIn(GPR[GPR_idx], VReg);
1511 SDValue Val = DAG.getCopyFromReg(Root, VReg, PtrVT);
1512 SDValue Store = DAG.getTruncStore(Val.getValue(1), Val, FIN,
1513 NULL, 0, ObjSize==1 ? MVT::i8 : MVT::i16 );
1514 MemOps.push_back(Store);
1516 if (isMachoABI) ArgOffset += PtrByteSize;
1518 ArgOffset += PtrByteSize;
1522 for (unsigned j = 0; j < ArgSize; j += PtrByteSize) {
1523 // Store whatever pieces of the object are in registers
1524 // to memory. ArgVal will be address of the beginning of
1526 if (GPR_idx != Num_GPR_Regs) {
1527 unsigned VReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass);
1528 RegInfo.addLiveIn(GPR[GPR_idx], VReg);
1529 int FI = MFI->CreateFixedObject(PtrByteSize, ArgOffset);
1530 SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
1531 SDValue Val = DAG.getCopyFromReg(Root, VReg, PtrVT);
1532 SDValue Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
1533 MemOps.push_back(Store);
1535 if (isMachoABI) ArgOffset += PtrByteSize;
1537 ArgOffset += ArgSize - (ArgOffset-CurArgOffset);
1544 switch (ObjectVT.getSimpleVT()) {
1545 default: assert(0 && "Unhandled argument type!");
1548 // Double word align in ELF
1549 if (Align && isELF32_ABI) GPR_idx += (GPR_idx % 2);
1551 if (GPR_idx != Num_GPR_Regs) {
1552 unsigned VReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass);
1553 RegInfo.addLiveIn(GPR[GPR_idx], VReg);
1554 ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i32);
1558 ArgSize = PtrByteSize;
1560 // Stack align in ELF
1561 if (needsLoad && Align && isELF32_ABI)
1562 ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
1563 // All int arguments reserve stack space in Macho ABI.
1564 if (isMachoABI || needsLoad) ArgOffset += PtrByteSize;
1568 case MVT::i64: // PPC64
1569 if (GPR_idx != Num_GPR_Regs) {
1570 unsigned VReg = RegInfo.createVirtualRegister(&PPC::G8RCRegClass);
1571 RegInfo.addLiveIn(GPR[GPR_idx], VReg);
1572 ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i64);
1574 if (ObjectVT == MVT::i32) {
1575 // PPC64 passes i8, i16, and i32 values in i64 registers. Promote
1576 // value to MVT::i64 and then truncate to the correct register size.
1578 ArgVal = DAG.getNode(ISD::AssertSext, MVT::i64, ArgVal,
1579 DAG.getValueType(ObjectVT));
1580 else if (Flags.isZExt())
1581 ArgVal = DAG.getNode(ISD::AssertZext, MVT::i64, ArgVal,
1582 DAG.getValueType(ObjectVT));
1584 ArgVal = DAG.getNode(ISD::TRUNCATE, MVT::i32, ArgVal);
1590 ArgSize = PtrByteSize;
1592 // All int arguments reserve stack space in Macho ABI.
1593 if (isMachoABI || needsLoad) ArgOffset += 8;
1598 // Every 4 bytes of argument space consumes one of the GPRs available for
1599 // argument passing.
1600 if (GPR_idx != Num_GPR_Regs && isMachoABI) {
1602 if (ObjSize == 8 && GPR_idx != Num_GPR_Regs && !isPPC64)
1605 if (FPR_idx != Num_FPR_Regs) {
1607 if (ObjectVT == MVT::f32)
1608 VReg = RegInfo.createVirtualRegister(&PPC::F4RCRegClass);
1610 VReg = RegInfo.createVirtualRegister(&PPC::F8RCRegClass);
1611 RegInfo.addLiveIn(FPR[FPR_idx], VReg);
1612 ArgVal = DAG.getCopyFromReg(Root, VReg, ObjectVT);
1618 // Stack align in ELF
1619 if (needsLoad && Align && isELF32_ABI)
1620 ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
1621 // All FP arguments reserve stack space in Macho ABI.
1622 if (isMachoABI || needsLoad) ArgOffset += isPPC64 ? 8 : ObjSize;
1628 // Note that vector arguments in registers don't reserve stack space,
1629 // except in varargs functions.
1630 if (VR_idx != Num_VR_Regs) {
1631 unsigned VReg = RegInfo.createVirtualRegister(&PPC::VRRCRegClass);
1632 RegInfo.addLiveIn(VR[VR_idx], VReg);
1633 ArgVal = DAG.getCopyFromReg(Root, VReg, ObjectVT);
1635 while ((ArgOffset % 16) != 0) {
1636 ArgOffset += PtrByteSize;
1637 if (GPR_idx != Num_GPR_Regs)
1641 GPR_idx = std::min(GPR_idx+4, Num_GPR_Regs);
1645 if (!isVarArg && !isPPC64) {
1646 // Vectors go after all the nonvectors.
1647 CurArgOffset = VecArgOffset;
1650 // Vectors are aligned.
1651 ArgOffset = ((ArgOffset+15)/16)*16;
1652 CurArgOffset = ArgOffset;
1660 // We need to load the argument to a virtual register if we determined above
1661 // that we ran out of physical registers of the appropriate type.
1663 int FI = MFI->CreateFixedObject(ObjSize,
1664 CurArgOffset + (ArgSize - ObjSize),
1666 SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
1667 ArgVal = DAG.getLoad(ObjectVT, Root, FIN, NULL, 0);
1670 ArgValues.push_back(ArgVal);
1673 // Set the size that is at least reserved in caller of this function. Tail
1674 // call optimized function's reserved stack space needs to be aligned so that
1675 // taking the difference between two stack areas will result in an aligned
1677 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
1678 // Add the Altivec parameters at the end, if needed.
1679 if (nAltivecParamsAtEnd) {
1680 MinReservedArea = ((MinReservedArea+15)/16)*16;
1681 MinReservedArea += 16*nAltivecParamsAtEnd;
1684 std::max(MinReservedArea,
1685 PPCFrameInfo::getMinCallFrameSize(isPPC64, isMachoABI));
1686 unsigned TargetAlign = DAG.getMachineFunction().getTarget().getFrameInfo()->
1687 getStackAlignment();
1688 unsigned AlignMask = TargetAlign-1;
1689 MinReservedArea = (MinReservedArea + AlignMask) & ~AlignMask;
1690 FI->setMinReservedArea(MinReservedArea);
1692 // If the function takes variable number of arguments, make a frame index for
1693 // the start of the first vararg value... for expansion of llvm.va_start.
1698 VarArgsNumGPR = GPR_idx;
1699 VarArgsNumFPR = FPR_idx;
1701 // Make room for Num_GPR_Regs, Num_FPR_Regs and for a possible frame
1703 depth = -(Num_GPR_Regs * PtrVT.getSizeInBits()/8 +
1704 Num_FPR_Regs * MVT(MVT::f64).getSizeInBits()/8 +
1705 PtrVT.getSizeInBits()/8);
1707 VarArgsStackOffset = MFI->CreateFixedObject(PtrVT.getSizeInBits()/8,
1714 VarArgsFrameIndex = MFI->CreateFixedObject(PtrVT.getSizeInBits()/8,
1716 SDValue FIN = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1718 // In ELF 32 ABI, the fixed integer arguments of a variadic function are
1719 // stored to the VarArgsFrameIndex on the stack.
1721 for (GPR_idx = 0; GPR_idx != VarArgsNumGPR; ++GPR_idx) {
1722 SDValue Val = DAG.getRegister(GPR[GPR_idx], PtrVT);
1723 SDValue Store = DAG.getStore(Root, Val, FIN, NULL, 0);
1724 MemOps.push_back(Store);
1725 // Increment the address by four for the next argument to store
1726 SDValue PtrOff = DAG.getConstant(PtrVT.getSizeInBits()/8, PtrVT);
1727 FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
1731 // If this function is vararg, store any remaining integer argument regs
1732 // to their spots on the stack so that they may be loaded by deferencing the
1733 // result of va_next.
1734 for (; GPR_idx != Num_GPR_Regs; ++GPR_idx) {
1737 VReg = RegInfo.createVirtualRegister(&PPC::G8RCRegClass);
1739 VReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass);
1741 RegInfo.addLiveIn(GPR[GPR_idx], VReg);
1742 SDValue Val = DAG.getCopyFromReg(Root, VReg, PtrVT);
1743 SDValue Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
1744 MemOps.push_back(Store);
1745 // Increment the address by four for the next argument to store
1746 SDValue PtrOff = DAG.getConstant(PtrVT.getSizeInBits()/8, PtrVT);
1747 FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
1750 // In ELF 32 ABI, the double arguments are stored to the VarArgsFrameIndex
1753 for (FPR_idx = 0; FPR_idx != VarArgsNumFPR; ++FPR_idx) {
1754 SDValue Val = DAG.getRegister(FPR[FPR_idx], MVT::f64);
1755 SDValue Store = DAG.getStore(Root, Val, FIN, NULL, 0);
1756 MemOps.push_back(Store);
1757 // Increment the address by eight for the next argument to store
1758 SDValue PtrOff = DAG.getConstant(MVT(MVT::f64).getSizeInBits()/8,
1760 FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
1763 for (; FPR_idx != Num_FPR_Regs; ++FPR_idx) {
1765 VReg = RegInfo.createVirtualRegister(&PPC::F8RCRegClass);
1767 RegInfo.addLiveIn(FPR[FPR_idx], VReg);
1768 SDValue Val = DAG.getCopyFromReg(Root, VReg, MVT::f64);
1769 SDValue Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
1770 MemOps.push_back(Store);
1771 // Increment the address by eight for the next argument to store
1772 SDValue PtrOff = DAG.getConstant(MVT(MVT::f64).getSizeInBits()/8,
1774 FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
1779 if (!MemOps.empty())
1780 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,&MemOps[0],MemOps.size());
1782 ArgValues.push_back(Root);
1784 // Return the new list of results.
1785 return DAG.getMergeValues(Op.getNode()->getVTList(), &ArgValues[0],
1789 /// CalculateParameterAndLinkageAreaSize - Get the size of the paramter plus
1792 CalculateParameterAndLinkageAreaSize(SelectionDAG &DAG,
1798 unsigned &nAltivecParamsAtEnd) {
1799 // Count how many bytes are to be pushed on the stack, including the linkage
1800 // area, and parameter passing area. We start with 24/48 bytes, which is
1801 // prereserved space for [SP][CR][LR][3 x unused].
1802 unsigned NumBytes = PPCFrameInfo::getLinkageSize(isPPC64, isMachoABI);
1803 unsigned NumOps = (Call.getNumOperands() - 5) / 2;
1804 unsigned PtrByteSize = isPPC64 ? 8 : 4;
1806 // Add up all the space actually used.
1807 // In 32-bit non-varargs calls, Altivec parameters all go at the end; usually
1808 // they all go in registers, but we must reserve stack space for them for
1809 // possible use by the caller. In varargs or 64-bit calls, parameters are
1810 // assigned stack space in order, with padding so Altivec parameters are
1812 nAltivecParamsAtEnd = 0;
1813 for (unsigned i = 0; i != NumOps; ++i) {
1814 SDValue Arg = Call.getOperand(5+2*i);
1815 SDValue Flag = Call.getOperand(5+2*i+1);
1816 MVT ArgVT = Arg.getValueType();
1817 // Varargs Altivec parameters are padded to a 16 byte boundary.
1818 if (ArgVT==MVT::v4f32 || ArgVT==MVT::v4i32 ||
1819 ArgVT==MVT::v8i16 || ArgVT==MVT::v16i8) {
1820 if (!isVarArg && !isPPC64) {
1821 // Non-varargs Altivec parameters go after all the non-Altivec
1822 // parameters; handle those later so we know how much padding we need.
1823 nAltivecParamsAtEnd++;
1826 // Varargs and 64-bit Altivec parameters are padded to 16 byte boundary.
1827 NumBytes = ((NumBytes+15)/16)*16;
1829 NumBytes += CalculateStackSlotSize(Arg, Flag, isVarArg, PtrByteSize);
1832 // Allow for Altivec parameters at the end, if needed.
1833 if (nAltivecParamsAtEnd) {
1834 NumBytes = ((NumBytes+15)/16)*16;
1835 NumBytes += 16*nAltivecParamsAtEnd;
1838 // The prolog code of the callee may store up to 8 GPR argument registers to
1839 // the stack, allowing va_start to index over them in memory if its varargs.
1840 // Because we cannot tell if this is needed on the caller side, we have to
1841 // conservatively assume that it is needed. As such, make sure we have at
1842 // least enough stack space for the caller to store the 8 GPRs.
1843 NumBytes = std::max(NumBytes,
1844 PPCFrameInfo::getMinCallFrameSize(isPPC64, isMachoABI));
1846 // Tail call needs the stack to be aligned.
1847 if (CC==CallingConv::Fast && PerformTailCallOpt) {
1848 unsigned TargetAlign = DAG.getMachineFunction().getTarget().getFrameInfo()->
1849 getStackAlignment();
1850 unsigned AlignMask = TargetAlign-1;
1851 NumBytes = (NumBytes + AlignMask) & ~AlignMask;
1857 /// CalculateTailCallSPDiff - Get the amount the stack pointer has to be
1858 /// adjusted to accomodate the arguments for the tailcall.
1859 static int CalculateTailCallSPDiff(SelectionDAG& DAG, bool IsTailCall,
1860 unsigned ParamSize) {
1862 if (!IsTailCall) return 0;
1864 PPCFunctionInfo *FI = DAG.getMachineFunction().getInfo<PPCFunctionInfo>();
1865 unsigned CallerMinReservedArea = FI->getMinReservedArea();
1866 int SPDiff = (int)CallerMinReservedArea - (int)ParamSize;
1867 // Remember only if the new adjustement is bigger.
1868 if (SPDiff < FI->getTailCallSPDelta())
1869 FI->setTailCallSPDelta(SPDiff);
1874 /// IsEligibleForTailCallElimination - Check to see whether the next instruction
1875 /// following the call is a return. A function is eligible if caller/callee
1876 /// calling conventions match, currently only fastcc supports tail calls, and
1877 /// the function CALL is immediatly followed by a RET.
1879 PPCTargetLowering::IsEligibleForTailCallOptimization(SDValue Call,
1881 SelectionDAG& DAG) const {
1882 // Variable argument functions are not supported.
1883 if (!PerformTailCallOpt ||
1884 cast<ConstantSDNode>(Call.getOperand(2))->getValue() != 0) return false;
1886 if (CheckTailCallReturnConstraints(Call, Ret)) {
1887 MachineFunction &MF = DAG.getMachineFunction();
1888 unsigned CallerCC = MF.getFunction()->getCallingConv();
1889 unsigned CalleeCC = cast<ConstantSDNode>(Call.getOperand(1))->getValue();
1890 if (CalleeCC == CallingConv::Fast && CallerCC == CalleeCC) {
1891 // Functions containing by val parameters are not supported.
1892 for (unsigned i = 0; i != ((Call.getNumOperands()-5)/2); i++) {
1893 ISD::ArgFlagsTy Flags = cast<ARG_FLAGSSDNode>(Call.getOperand(5+2*i+1))
1895 if (Flags.isByVal()) return false;
1898 SDValue Callee = Call.getOperand(4);
1899 // Non PIC/GOT tail calls are supported.
1900 if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
1903 // At the moment we can only do local tail calls (in same module, hidden
1904 // or protected) if we are generating PIC.
1905 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
1906 return G->getGlobal()->hasHiddenVisibility()
1907 || G->getGlobal()->hasProtectedVisibility();
1914 /// isCallCompatibleAddress - Return the immediate to use if the specified
1915 /// 32-bit value is representable in the immediate field of a BxA instruction.
1916 static SDNode *isBLACompatibleAddress(SDValue Op, SelectionDAG &DAG) {
1917 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
1920 int Addr = C->getValue();
1921 if ((Addr & 3) != 0 || // Low 2 bits are implicitly zero.
1922 (Addr << 6 >> 6) != Addr)
1923 return 0; // Top 6 bits have to be sext of immediate.
1925 return DAG.getConstant((int)C->getValue() >> 2,
1926 DAG.getTargetLoweringInfo().getPointerTy()).getNode();
1931 struct TailCallArgumentInfo {
1936 TailCallArgumentInfo() : FrameIdx(0) {}
1941 /// StoreTailCallArgumentsToStackSlot - Stores arguments to their stack slot.
1943 StoreTailCallArgumentsToStackSlot(SelectionDAG &DAG,
1945 const SmallVector<TailCallArgumentInfo, 8> &TailCallArgs,
1946 SmallVector<SDValue, 8> &MemOpChains) {
1947 for (unsigned i = 0, e = TailCallArgs.size(); i != e; ++i) {
1948 SDValue Arg = TailCallArgs[i].Arg;
1949 SDValue FIN = TailCallArgs[i].FrameIdxOp;
1950 int FI = TailCallArgs[i].FrameIdx;
1951 // Store relative to framepointer.
1952 MemOpChains.push_back(DAG.getStore(Chain, Arg, FIN,
1953 PseudoSourceValue::getFixedStack(FI),
1958 /// EmitTailCallStoreFPAndRetAddr - Move the frame pointer and return address to
1959 /// the appropriate stack slot for the tail call optimized function call.
1960 static SDValue EmitTailCallStoreFPAndRetAddr(SelectionDAG &DAG,
1961 MachineFunction &MF,
1969 // Calculate the new stack slot for the return address.
1970 int SlotSize = isPPC64 ? 8 : 4;
1971 int NewRetAddrLoc = SPDiff + PPCFrameInfo::getReturnSaveOffset(isPPC64,
1973 int NewRetAddr = MF.getFrameInfo()->CreateFixedObject(SlotSize,
1975 int NewFPLoc = SPDiff + PPCFrameInfo::getFramePointerSaveOffset(isPPC64,
1977 int NewFPIdx = MF.getFrameInfo()->CreateFixedObject(SlotSize, NewFPLoc);
1979 MVT VT = isPPC64 ? MVT::i64 : MVT::i32;
1980 SDValue NewRetAddrFrIdx = DAG.getFrameIndex(NewRetAddr, VT);
1981 Chain = DAG.getStore(Chain, OldRetAddr, NewRetAddrFrIdx,
1982 PseudoSourceValue::getFixedStack(NewRetAddr), 0);
1983 SDValue NewFramePtrIdx = DAG.getFrameIndex(NewFPIdx, VT);
1984 Chain = DAG.getStore(Chain, OldFP, NewFramePtrIdx,
1985 PseudoSourceValue::getFixedStack(NewFPIdx), 0);
1990 /// CalculateTailCallArgDest - Remember Argument for later processing. Calculate
1991 /// the position of the argument.
1993 CalculateTailCallArgDest(SelectionDAG &DAG, MachineFunction &MF, bool isPPC64,
1994 SDValue Arg, int SPDiff, unsigned ArgOffset,
1995 SmallVector<TailCallArgumentInfo, 8>& TailCallArguments) {
1996 int Offset = ArgOffset + SPDiff;
1997 uint32_t OpSize = (Arg.getValueType().getSizeInBits()+7)/8;
1998 int FI = MF.getFrameInfo()->CreateFixedObject(OpSize, Offset);
1999 MVT VT = isPPC64 ? MVT::i64 : MVT::i32;
2000 SDValue FIN = DAG.getFrameIndex(FI, VT);
2001 TailCallArgumentInfo Info;
2003 Info.FrameIdxOp = FIN;
2005 TailCallArguments.push_back(Info);
2008 /// EmitTCFPAndRetAddrLoad - Emit load from frame pointer and return address
2009 /// stack slot. Returns the chain as result and the loaded frame pointers in
2010 /// LROpOut/FPOpout. Used when tail calling.
2011 SDValue PPCTargetLowering::EmitTailCallLoadFPAndRetAddr(SelectionDAG & DAG,
2017 // Load the LR and FP stack slot for later adjusting.
2018 MVT VT = PPCSubTarget.isPPC64() ? MVT::i64 : MVT::i32;
2019 LROpOut = getReturnAddrFrameIndex(DAG);
2020 LROpOut = DAG.getLoad(VT, Chain, LROpOut, NULL, 0);
2021 Chain = SDValue(LROpOut.getNode(), 1);
2022 FPOpOut = getFramePointerFrameIndex(DAG);
2023 FPOpOut = DAG.getLoad(VT, Chain, FPOpOut, NULL, 0);
2024 Chain = SDValue(FPOpOut.getNode(), 1);
2029 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
2030 /// by "Src" to address "Dst" of size "Size". Alignment information is
2031 /// specified by the specific parameter attribute. The copy will be passed as
2032 /// a byval function parameter.
2033 /// Sometimes what we are copying is the end of a larger object, the part that
2034 /// does not fit in registers.
2036 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
2037 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
2039 SDValue SizeNode = DAG.getConstant(Size, MVT::i32);
2040 return DAG.getMemcpy(Chain, Dst, Src, SizeNode, Flags.getByValAlign(), false,
2044 /// LowerMemOpCallTo - Store the argument to the stack or remember it in case of
2047 LowerMemOpCallTo(SelectionDAG &DAG, MachineFunction &MF, SDValue Chain,
2048 SDValue Arg, SDValue PtrOff, int SPDiff,
2049 unsigned ArgOffset, bool isPPC64, bool isTailCall,
2050 bool isVector, SmallVector<SDValue, 8> &MemOpChains,
2051 SmallVector<TailCallArgumentInfo, 8>& TailCallArguments) {
2052 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2057 StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
2059 StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
2060 PtrOff = DAG.getNode(ISD::ADD, PtrVT, StackPtr,
2061 DAG.getConstant(ArgOffset, PtrVT));
2063 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
2064 // Calculate and remember argument location.
2065 } else CalculateTailCallArgDest(DAG, MF, isPPC64, Arg, SPDiff, ArgOffset,
2069 SDValue PPCTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG,
2070 const PPCSubtarget &Subtarget,
2071 TargetMachine &TM) {
2072 SDValue Chain = Op.getOperand(0);
2073 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
2074 unsigned CC = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
2075 bool isTailCall = cast<ConstantSDNode>(Op.getOperand(3))->getValue() != 0 &&
2076 CC == CallingConv::Fast && PerformTailCallOpt;
2077 SDValue Callee = Op.getOperand(4);
2078 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
2080 bool isMachoABI = Subtarget.isMachoABI();
2081 bool isELF32_ABI = Subtarget.isELF32_ABI();
2083 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2084 bool isPPC64 = PtrVT == MVT::i64;
2085 unsigned PtrByteSize = isPPC64 ? 8 : 4;
2087 MachineFunction &MF = DAG.getMachineFunction();
2089 // args_to_use will accumulate outgoing args for the PPCISD::CALL case in
2090 // SelectExpr to use to put the arguments in the appropriate registers.
2091 std::vector<SDValue> args_to_use;
2093 // Mark this function as potentially containing a function that contains a
2094 // tail call. As a consequence the frame pointer will be used for dynamicalloc
2095 // and restoring the callers stack pointer in this functions epilog. This is
2096 // done because by tail calling the called function might overwrite the value
2097 // in this function's (MF) stack pointer stack slot 0(SP).
2098 if (PerformTailCallOpt && CC==CallingConv::Fast)
2099 MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
2101 unsigned nAltivecParamsAtEnd = 0;
2103 // Count how many bytes are to be pushed on the stack, including the linkage
2104 // area, and parameter passing area. We start with 24/48 bytes, which is
2105 // prereserved space for [SP][CR][LR][3 x unused].
2107 CalculateParameterAndLinkageAreaSize(DAG, isPPC64, isMachoABI, isVarArg, CC,
2108 Op, nAltivecParamsAtEnd);
2110 // Calculate by how many bytes the stack has to be adjusted in case of tail
2111 // call optimization.
2112 int SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
2114 // Adjust the stack pointer for the new arguments...
2115 // These operations are automatically eliminated by the prolog/epilog pass
2116 Chain = DAG.getCALLSEQ_START(Chain,
2117 DAG.getConstant(NumBytes, PtrVT));
2118 SDValue CallSeqStart = Chain;
2120 // Load the return address and frame pointer so it can be move somewhere else
2123 Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp);
2125 // Set up a copy of the stack pointer for use loading and storing any
2126 // arguments that may not fit in the registers available for argument
2130 StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
2132 StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
2134 // Figure out which arguments are going to go in registers, and which in
2135 // memory. Also, if this is a vararg function, floating point operations
2136 // must be stored to our stack, and loaded into integer regs as well, if
2137 // any integer regs are available for argument passing.
2138 unsigned ArgOffset = PPCFrameInfo::getLinkageSize(isPPC64, isMachoABI);
2139 unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
2141 static const unsigned GPR_32[] = { // 32-bit registers.
2142 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
2143 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
2145 static const unsigned GPR_64[] = { // 64-bit registers.
2146 PPC::X3, PPC::X4, PPC::X5, PPC::X6,
2147 PPC::X7, PPC::X8, PPC::X9, PPC::X10,
2149 static const unsigned *FPR = GetFPR(Subtarget);
2151 static const unsigned VR[] = {
2152 PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
2153 PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
2155 const unsigned NumGPRs = array_lengthof(GPR_32);
2156 const unsigned NumFPRs = isMachoABI ? 13 : 8;
2157 const unsigned NumVRs = array_lengthof( VR);
2159 const unsigned *GPR = isPPC64 ? GPR_64 : GPR_32;
2161 std::vector<std::pair<unsigned, SDValue> > RegsToPass;
2162 SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
2164 SmallVector<SDValue, 8> MemOpChains;
2165 for (unsigned i = 0; i != NumOps; ++i) {
2167 SDValue Arg = Op.getOperand(5+2*i);
2168 ISD::ArgFlagsTy Flags =
2169 cast<ARG_FLAGSSDNode>(Op.getOperand(5+2*i+1))->getArgFlags();
2170 // See if next argument requires stack alignment in ELF
2171 bool Align = Flags.isSplit();
2173 // PtrOff will be used to store the current argument to the stack if a
2174 // register cannot be found for it.
2177 // Stack align in ELF 32
2178 if (isELF32_ABI && Align)
2179 PtrOff = DAG.getConstant(ArgOffset + ((ArgOffset/4) % 2) * PtrByteSize,
2180 StackPtr.getValueType());
2182 PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
2184 PtrOff = DAG.getNode(ISD::ADD, PtrVT, StackPtr, PtrOff);
2186 // On PPC64, promote integers to 64-bit values.
2187 if (isPPC64 && Arg.getValueType() == MVT::i32) {
2188 // FIXME: Should this use ANY_EXTEND if neither sext nor zext?
2189 unsigned ExtOp = Flags.isSExt() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
2190 Arg = DAG.getNode(ExtOp, MVT::i64, Arg);
2193 // FIXME Elf untested, what are alignment rules?
2194 // FIXME memcpy is used way more than necessary. Correctness first.
2195 if (Flags.isByVal()) {
2196 unsigned Size = Flags.getByValSize();
2197 if (isELF32_ABI && Align) GPR_idx += (GPR_idx % 2);
2198 if (Size==1 || Size==2) {
2199 // Very small objects are passed right-justified.
2200 // Everything else is passed left-justified.
2201 MVT VT = (Size==1) ? MVT::i8 : MVT::i16;
2202 if (GPR_idx != NumGPRs) {
2203 SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, PtrVT, Chain, Arg,
2205 MemOpChains.push_back(Load.getValue(1));
2206 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
2208 ArgOffset += PtrByteSize;
2210 SDValue Const = DAG.getConstant(4 - Size, PtrOff.getValueType());
2211 SDValue AddPtr = DAG.getNode(ISD::ADD, PtrVT, PtrOff, Const);
2212 SDValue MemcpyCall = CreateCopyOfByValArgument(Arg, AddPtr,
2213 CallSeqStart.getNode()->getOperand(0),
2215 // This must go outside the CALLSEQ_START..END.
2216 SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall,
2217 CallSeqStart.getNode()->getOperand(1));
2218 DAG.ReplaceAllUsesWith(CallSeqStart.getNode(),
2219 NewCallSeqStart.getNode());
2220 Chain = CallSeqStart = NewCallSeqStart;
2221 ArgOffset += PtrByteSize;
2225 // Copy entire object into memory. There are cases where gcc-generated
2226 // code assumes it is there, even if it could be put entirely into
2227 // registers. (This is not what the doc says.)
2228 SDValue MemcpyCall = CreateCopyOfByValArgument(Arg, PtrOff,
2229 CallSeqStart.getNode()->getOperand(0),
2231 // This must go outside the CALLSEQ_START..END.
2232 SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall,
2233 CallSeqStart.getNode()->getOperand(1));
2234 DAG.ReplaceAllUsesWith(CallSeqStart.getNode(), NewCallSeqStart.getNode());
2235 Chain = CallSeqStart = NewCallSeqStart;
2236 // And copy the pieces of it that fit into registers.
2237 for (unsigned j=0; j<Size; j+=PtrByteSize) {
2238 SDValue Const = DAG.getConstant(j, PtrOff.getValueType());
2239 SDValue AddArg = DAG.getNode(ISD::ADD, PtrVT, Arg, Const);
2240 if (GPR_idx != NumGPRs) {
2241 SDValue Load = DAG.getLoad(PtrVT, Chain, AddArg, NULL, 0);
2242 MemOpChains.push_back(Load.getValue(1));
2243 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
2245 ArgOffset += PtrByteSize;
2247 ArgOffset += ((Size - j + PtrByteSize-1)/PtrByteSize)*PtrByteSize;
2254 switch (Arg.getValueType().getSimpleVT()) {
2255 default: assert(0 && "Unexpected ValueType for argument!");
2258 // Double word align in ELF
2259 if (isELF32_ABI && Align) GPR_idx += (GPR_idx % 2);
2260 if (GPR_idx != NumGPRs) {
2261 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Arg));
2263 LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
2264 isPPC64, isTailCall, false, MemOpChains,
2268 if (inMem || isMachoABI) {
2269 // Stack align in ELF
2270 if (isELF32_ABI && Align)
2271 ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
2273 ArgOffset += PtrByteSize;
2278 if (FPR_idx != NumFPRs) {
2279 RegsToPass.push_back(std::make_pair(FPR[FPR_idx++], Arg));
2282 SDValue Store = DAG.getStore(Chain, Arg, PtrOff, NULL, 0);
2283 MemOpChains.push_back(Store);
2285 // Float varargs are always shadowed in available integer registers
2286 if (GPR_idx != NumGPRs) {
2287 SDValue Load = DAG.getLoad(PtrVT, Store, PtrOff, NULL, 0);
2288 MemOpChains.push_back(Load.getValue(1));
2289 if (isMachoABI) RegsToPass.push_back(std::make_pair(GPR[GPR_idx++],
2292 if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 && !isPPC64){
2293 SDValue ConstFour = DAG.getConstant(4, PtrOff.getValueType());
2294 PtrOff = DAG.getNode(ISD::ADD, PtrVT, PtrOff, ConstFour);
2295 SDValue Load = DAG.getLoad(PtrVT, Store, PtrOff, NULL, 0);
2296 MemOpChains.push_back(Load.getValue(1));
2297 if (isMachoABI) RegsToPass.push_back(std::make_pair(GPR[GPR_idx++],
2301 // If we have any FPRs remaining, we may also have GPRs remaining.
2302 // Args passed in FPRs consume either 1 (f32) or 2 (f64) available
2305 if (GPR_idx != NumGPRs)
2307 if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 &&
2308 !isPPC64) // PPC64 has 64-bit GPR's obviously :)
2313 LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
2314 isPPC64, isTailCall, false, MemOpChains,
2318 if (inMem || isMachoABI) {
2319 // Stack align in ELF
2320 if (isELF32_ABI && Align)
2321 ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
2325 ArgOffset += Arg.getValueType() == MVT::f32 ? 4 : 8;
2333 // These go aligned on the stack, or in the corresponding R registers
2334 // when within range. The Darwin PPC ABI doc claims they also go in
2335 // V registers; in fact gcc does this only for arguments that are
2336 // prototyped, not for those that match the ... We do it for all
2337 // arguments, seems to work.
2338 while (ArgOffset % 16 !=0) {
2339 ArgOffset += PtrByteSize;
2340 if (GPR_idx != NumGPRs)
2343 // We could elide this store in the case where the object fits
2344 // entirely in R registers. Maybe later.
2345 PtrOff = DAG.getNode(ISD::ADD, PtrVT, StackPtr,
2346 DAG.getConstant(ArgOffset, PtrVT));
2347 SDValue Store = DAG.getStore(Chain, Arg, PtrOff, NULL, 0);
2348 MemOpChains.push_back(Store);
2349 if (VR_idx != NumVRs) {
2350 SDValue Load = DAG.getLoad(MVT::v4f32, Store, PtrOff, NULL, 0);
2351 MemOpChains.push_back(Load.getValue(1));
2352 RegsToPass.push_back(std::make_pair(VR[VR_idx++], Load));
2355 for (unsigned i=0; i<16; i+=PtrByteSize) {
2356 if (GPR_idx == NumGPRs)
2358 SDValue Ix = DAG.getNode(ISD::ADD, PtrVT, PtrOff,
2359 DAG.getConstant(i, PtrVT));
2360 SDValue Load = DAG.getLoad(PtrVT, Store, Ix, NULL, 0);
2361 MemOpChains.push_back(Load.getValue(1));
2362 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
2367 // Non-varargs Altivec params generally go in registers, but have
2368 // stack space allocated at the end.
2369 if (VR_idx != NumVRs) {
2370 // Doesn't have GPR space allocated.
2371 RegsToPass.push_back(std::make_pair(VR[VR_idx++], Arg));
2372 } else if (nAltivecParamsAtEnd==0) {
2373 // We are emitting Altivec params in order.
2374 LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
2375 isPPC64, isTailCall, true, MemOpChains,
2382 // If all Altivec parameters fit in registers, as they usually do,
2383 // they get stack space following the non-Altivec parameters. We
2384 // don't track this here because nobody below needs it.
2385 // If there are more Altivec parameters than fit in registers emit
2387 if (!isVarArg && nAltivecParamsAtEnd > NumVRs) {
2389 // Offset is aligned; skip 1st 12 params which go in V registers.
2390 ArgOffset = ((ArgOffset+15)/16)*16;
2392 for (unsigned i = 0; i != NumOps; ++i) {
2393 SDValue Arg = Op.getOperand(5+2*i);
2394 MVT ArgType = Arg.getValueType();
2395 if (ArgType==MVT::v4f32 || ArgType==MVT::v4i32 ||
2396 ArgType==MVT::v8i16 || ArgType==MVT::v16i8) {
2399 // We are emitting Altivec params in order.
2400 LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
2401 isPPC64, isTailCall, true, MemOpChains,
2409 if (!MemOpChains.empty())
2410 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
2411 &MemOpChains[0], MemOpChains.size());
2413 // Build a sequence of copy-to-reg nodes chained together with token chain
2414 // and flag operands which copy the outgoing args into the appropriate regs.
2416 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
2417 Chain = DAG.getCopyToReg(Chain, RegsToPass[i].first, RegsToPass[i].second,
2419 InFlag = Chain.getValue(1);
2422 // With the ELF 32 ABI, set CR6 to true if this is a vararg call.
2423 if (isVarArg && isELF32_ABI) {
2424 SDValue SetCR(DAG.getTargetNode(PPC::CRSET, MVT::i32), 0);
2425 Chain = DAG.getCopyToReg(Chain, PPC::CR1EQ, SetCR, InFlag);
2426 InFlag = Chain.getValue(1);
2429 // Emit a sequence of copyto/copyfrom virtual registers for arguments that
2430 // might overwrite each other in case of tail call optimization.
2432 SmallVector<SDValue, 8> MemOpChains2;
2433 // Do not flag preceeding copytoreg stuff together with the following stuff.
2435 StoreTailCallArgumentsToStackSlot(DAG, Chain, TailCallArguments,
2437 if (!MemOpChains2.empty())
2438 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
2439 &MemOpChains2[0], MemOpChains2.size());
2441 // Store the return address to the appropriate stack slot.
2442 Chain = EmitTailCallStoreFPAndRetAddr(DAG, MF, Chain, LROp, FPOp, SPDiff,
2443 isPPC64, isMachoABI);
2446 // Emit callseq_end just before tailcall node.
2448 SmallVector<SDValue, 8> CallSeqOps;
2449 SDVTList CallSeqNodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
2450 CallSeqOps.push_back(Chain);
2451 CallSeqOps.push_back(DAG.getIntPtrConstant(NumBytes));
2452 CallSeqOps.push_back(DAG.getIntPtrConstant(0));
2453 if (InFlag.getNode())
2454 CallSeqOps.push_back(InFlag);
2455 Chain = DAG.getNode(ISD::CALLSEQ_END, CallSeqNodeTys, &CallSeqOps[0],
2457 InFlag = Chain.getValue(1);
2460 std::vector<MVT> NodeTys;
2461 NodeTys.push_back(MVT::Other); // Returns a chain
2462 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
2464 SmallVector<SDValue, 8> Ops;
2465 unsigned CallOpc = isMachoABI? PPCISD::CALL_Macho : PPCISD::CALL_ELF;
2467 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
2468 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
2469 // node so that legalize doesn't hack it.
2470 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
2471 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), Callee.getValueType());
2472 else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
2473 Callee = DAG.getTargetExternalSymbol(S->getSymbol(), Callee.getValueType());
2474 else if (SDNode *Dest = isBLACompatibleAddress(Callee, DAG))
2475 // If this is an absolute destination address, use the munged value.
2476 Callee = SDValue(Dest, 0);
2478 // Otherwise, this is an indirect call. We have to use a MTCTR/BCTRL pair
2479 // to do the call, we can't use PPCISD::CALL.
2480 SDValue MTCTROps[] = {Chain, Callee, InFlag};
2481 Chain = DAG.getNode(PPCISD::MTCTR, NodeTys, MTCTROps,
2482 2 + (InFlag.getNode() != 0));
2483 InFlag = Chain.getValue(1);
2485 // Copy the callee address into R12/X12 on darwin.
2487 unsigned Reg = Callee.getValueType() == MVT::i32 ? PPC::R12 : PPC::X12;
2488 Chain = DAG.getCopyToReg(Chain, Reg, Callee, InFlag);
2489 InFlag = Chain.getValue(1);
2493 NodeTys.push_back(MVT::Other);
2494 NodeTys.push_back(MVT::Flag);
2495 Ops.push_back(Chain);
2496 CallOpc = isMachoABI ? PPCISD::BCTRL_Macho : PPCISD::BCTRL_ELF;
2498 // Add CTR register as callee so a bctr can be emitted later.
2500 Ops.push_back(DAG.getRegister(PPC::CTR, getPointerTy()));
2503 // If this is a direct call, pass the chain and the callee.
2504 if (Callee.getNode()) {
2505 Ops.push_back(Chain);
2506 Ops.push_back(Callee);
2508 // If this is a tail call add stack pointer delta.
2510 Ops.push_back(DAG.getConstant(SPDiff, MVT::i32));
2512 // Add argument registers to the end of the list so that they are known live
2514 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
2515 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
2516 RegsToPass[i].second.getValueType()));
2518 // When performing tail call optimization the callee pops its arguments off
2519 // the stack. Account for this here so these bytes can be pushed back on in
2520 // PPCRegisterInfo::eliminateCallFramePseudoInstr.
2521 int BytesCalleePops =
2522 (CC==CallingConv::Fast && PerformTailCallOpt) ? NumBytes : 0;
2524 if (InFlag.getNode())
2525 Ops.push_back(InFlag);
2529 assert(InFlag.getNode() &&
2530 "Flag must be set. Depend on flag being set in LowerRET");
2531 Chain = DAG.getNode(PPCISD::TAILCALL,
2532 Op.getNode()->getVTList(), &Ops[0], Ops.size());
2533 return SDValue(Chain.getNode(), Op.getResNo());
2536 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
2537 InFlag = Chain.getValue(1);
2539 Chain = DAG.getCALLSEQ_END(Chain,
2540 DAG.getConstant(NumBytes, PtrVT),
2541 DAG.getConstant(BytesCalleePops, PtrVT),
2543 if (Op.getNode()->getValueType(0) != MVT::Other)
2544 InFlag = Chain.getValue(1);
2546 SmallVector<SDValue, 16> ResultVals;
2547 SmallVector<CCValAssign, 16> RVLocs;
2548 unsigned CallerCC = DAG.getMachineFunction().getFunction()->getCallingConv();
2549 CCState CCInfo(CallerCC, isVarArg, TM, RVLocs);
2550 CCInfo.AnalyzeCallResult(Op.getNode(), RetCC_PPC);
2552 // Copy all of the result registers out of their specified physreg.
2553 for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
2554 CCValAssign &VA = RVLocs[i];
2555 MVT VT = VA.getValVT();
2556 assert(VA.isRegLoc() && "Can only return in registers!");
2557 Chain = DAG.getCopyFromReg(Chain, VA.getLocReg(), VT, InFlag).getValue(1);
2558 ResultVals.push_back(Chain.getValue(0));
2559 InFlag = Chain.getValue(2);
2562 // If the function returns void, just return the chain.
2566 // Otherwise, merge everything together with a MERGE_VALUES node.
2567 ResultVals.push_back(Chain);
2568 SDValue Res = DAG.getMergeValues(Op.getNode()->getVTList(), &ResultVals[0],
2570 return Res.getValue(Op.getResNo());
2573 SDValue PPCTargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG,
2574 TargetMachine &TM) {
2575 SmallVector<CCValAssign, 16> RVLocs;
2576 unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
2577 bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
2578 CCState CCInfo(CC, isVarArg, TM, RVLocs);
2579 CCInfo.AnalyzeReturn(Op.getNode(), RetCC_PPC);
2581 // If this is the first return lowered for this function, add the regs to the
2582 // liveout set for the function.
2583 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
2584 for (unsigned i = 0; i != RVLocs.size(); ++i)
2585 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
2588 SDValue Chain = Op.getOperand(0);
2590 Chain = GetPossiblePreceedingTailCall(Chain, PPCISD::TAILCALL);
2591 if (Chain.getOpcode() == PPCISD::TAILCALL) {
2592 SDValue TailCall = Chain;
2593 SDValue TargetAddress = TailCall.getOperand(1);
2594 SDValue StackAdjustment = TailCall.getOperand(2);
2596 assert(((TargetAddress.getOpcode() == ISD::Register &&
2597 cast<RegisterSDNode>(TargetAddress)->getReg() == PPC::CTR) ||
2598 TargetAddress.getOpcode() == ISD::TargetExternalSymbol ||
2599 TargetAddress.getOpcode() == ISD::TargetGlobalAddress ||
2600 isa<ConstantSDNode>(TargetAddress)) &&
2601 "Expecting an global address, external symbol, absolute value or register");
2603 assert(StackAdjustment.getOpcode() == ISD::Constant &&
2604 "Expecting a const value");
2606 SmallVector<SDValue,8> Operands;
2607 Operands.push_back(Chain.getOperand(0));
2608 Operands.push_back(TargetAddress);
2609 Operands.push_back(StackAdjustment);
2610 // Copy registers used by the call. Last operand is a flag so it is not
2612 for (unsigned i=3; i < TailCall.getNumOperands()-1; i++) {
2613 Operands.push_back(Chain.getOperand(i));
2615 return DAG.getNode(PPCISD::TC_RETURN, MVT::Other, &Operands[0],
2621 // Copy the result values into the output registers.
2622 for (unsigned i = 0; i != RVLocs.size(); ++i) {
2623 CCValAssign &VA = RVLocs[i];
2624 assert(VA.isRegLoc() && "Can only return in registers!");
2625 Chain = DAG.getCopyToReg(Chain, VA.getLocReg(), Op.getOperand(i*2+1), Flag);
2626 Flag = Chain.getValue(1);
2630 return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Chain, Flag);
2632 return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Chain);
2635 SDValue PPCTargetLowering::LowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG,
2636 const PPCSubtarget &Subtarget) {
2637 // When we pop the dynamic allocation we need to restore the SP link.
2639 // Get the corect type for pointers.
2640 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2642 // Construct the stack pointer operand.
2643 bool IsPPC64 = Subtarget.isPPC64();
2644 unsigned SP = IsPPC64 ? PPC::X1 : PPC::R1;
2645 SDValue StackPtr = DAG.getRegister(SP, PtrVT);
2647 // Get the operands for the STACKRESTORE.
2648 SDValue Chain = Op.getOperand(0);
2649 SDValue SaveSP = Op.getOperand(1);
2651 // Load the old link SP.
2652 SDValue LoadLinkSP = DAG.getLoad(PtrVT, Chain, StackPtr, NULL, 0);
2654 // Restore the stack pointer.
2655 Chain = DAG.getCopyToReg(LoadLinkSP.getValue(1), SP, SaveSP);
2657 // Store the old link SP.
2658 return DAG.getStore(Chain, LoadLinkSP, StackPtr, NULL, 0);
2664 PPCTargetLowering::getReturnAddrFrameIndex(SelectionDAG & DAG) const {
2665 MachineFunction &MF = DAG.getMachineFunction();
2666 bool IsPPC64 = PPCSubTarget.isPPC64();
2667 bool isMachoABI = PPCSubTarget.isMachoABI();
2668 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2670 // Get current frame pointer save index. The users of this index will be
2671 // primarily DYNALLOC instructions.
2672 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
2673 int RASI = FI->getReturnAddrSaveIndex();
2675 // If the frame pointer save index hasn't been defined yet.
2677 // Find out what the fix offset of the frame pointer save area.
2678 int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, isMachoABI);
2679 // Allocate the frame index for frame pointer save area.
2680 RASI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, LROffset);
2682 FI->setReturnAddrSaveIndex(RASI);
2684 return DAG.getFrameIndex(RASI, PtrVT);
2688 PPCTargetLowering::getFramePointerFrameIndex(SelectionDAG & DAG) const {
2689 MachineFunction &MF = DAG.getMachineFunction();
2690 bool IsPPC64 = PPCSubTarget.isPPC64();
2691 bool isMachoABI = PPCSubTarget.isMachoABI();
2692 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2694 // Get current frame pointer save index. The users of this index will be
2695 // primarily DYNALLOC instructions.
2696 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
2697 int FPSI = FI->getFramePointerSaveIndex();
2699 // If the frame pointer save index hasn't been defined yet.
2701 // Find out what the fix offset of the frame pointer save area.
2702 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, isMachoABI);
2704 // Allocate the frame index for frame pointer save area.
2705 FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, FPOffset);
2707 FI->setFramePointerSaveIndex(FPSI);
2709 return DAG.getFrameIndex(FPSI, PtrVT);
2712 SDValue PPCTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
2714 const PPCSubtarget &Subtarget) {
2716 SDValue Chain = Op.getOperand(0);
2717 SDValue Size = Op.getOperand(1);
2719 // Get the corect type for pointers.
2720 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2722 SDValue NegSize = DAG.getNode(ISD::SUB, PtrVT,
2723 DAG.getConstant(0, PtrVT), Size);
2724 // Construct a node for the frame pointer save index.
2725 SDValue FPSIdx = getFramePointerFrameIndex(DAG);
2726 // Build a DYNALLOC node.
2727 SDValue Ops[3] = { Chain, NegSize, FPSIdx };
2728 SDVTList VTs = DAG.getVTList(PtrVT, MVT::Other);
2729 return DAG.getNode(PPCISD::DYNALLOC, VTs, Ops, 3);
2732 /// LowerSELECT_CC - Lower floating point select_cc's into fsel instruction when
2734 SDValue PPCTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
2735 // Not FP? Not a fsel.
2736 if (!Op.getOperand(0).getValueType().isFloatingPoint() ||
2737 !Op.getOperand(2).getValueType().isFloatingPoint())
2740 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
2742 // Cannot handle SETEQ/SETNE.
2743 if (CC == ISD::SETEQ || CC == ISD::SETNE) return SDValue();
2745 MVT ResVT = Op.getValueType();
2746 MVT CmpVT = Op.getOperand(0).getValueType();
2747 SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
2748 SDValue TV = Op.getOperand(2), FV = Op.getOperand(3);
2750 // If the RHS of the comparison is a 0.0, we don't need to do the
2751 // subtraction at all.
2752 if (isFloatingPointZero(RHS))
2754 default: break; // SETUO etc aren't handled by fsel.
2757 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
2760 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
2761 LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
2762 return DAG.getNode(PPCISD::FSEL, ResVT, LHS, TV, FV);
2765 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
2768 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
2769 LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
2770 return DAG.getNode(PPCISD::FSEL, ResVT,
2771 DAG.getNode(ISD::FNEG, MVT::f64, LHS), TV, FV);
2776 default: break; // SETUO etc aren't handled by fsel.
2779 Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
2780 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
2781 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
2782 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
2785 Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
2786 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
2787 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
2788 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
2791 Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
2792 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
2793 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
2794 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
2797 Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
2798 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
2799 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
2800 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
2805 // FIXME: Split this code up when LegalizeDAGTypes lands.
2806 SDValue PPCTargetLowering::LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) {
2807 assert(Op.getOperand(0).getValueType().isFloatingPoint());
2808 SDValue Src = Op.getOperand(0);
2809 if (Src.getValueType() == MVT::f32)
2810 Src = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Src);
2813 switch (Op.getValueType().getSimpleVT()) {
2814 default: assert(0 && "Unhandled FP_TO_SINT type in custom expander!");
2816 Tmp = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Src);
2819 Tmp = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Src);
2823 // Convert the FP value to an int value through memory.
2824 SDValue FIPtr = DAG.CreateStackTemporary(MVT::f64);
2826 // Emit a store to the stack slot.
2827 SDValue Chain = DAG.getStore(DAG.getEntryNode(), Tmp, FIPtr, NULL, 0);
2829 // Result is a load from the stack slot. If loading 4 bytes, make sure to
2831 if (Op.getValueType() == MVT::i32)
2832 FIPtr = DAG.getNode(ISD::ADD, FIPtr.getValueType(), FIPtr,
2833 DAG.getConstant(4, FIPtr.getValueType()));
2834 return DAG.getLoad(Op.getValueType(), Chain, FIPtr, NULL, 0);
2837 SDValue PPCTargetLowering::LowerFP_ROUND_INREG(SDValue Op,
2838 SelectionDAG &DAG) {
2839 assert(Op.getValueType() == MVT::ppcf128);
2840 SDNode *Node = Op.getNode();
2841 assert(Node->getOperand(0).getValueType() == MVT::ppcf128);
2842 assert(Node->getOperand(0).getNode()->getOpcode() == ISD::BUILD_PAIR);
2843 SDValue Lo = Node->getOperand(0).getNode()->getOperand(0);
2844 SDValue Hi = Node->getOperand(0).getNode()->getOperand(1);
2846 // This sequence changes FPSCR to do round-to-zero, adds the two halves
2847 // of the long double, and puts FPSCR back the way it was. We do not
2848 // actually model FPSCR.
2849 std::vector<MVT> NodeTys;
2850 SDValue Ops[4], Result, MFFSreg, InFlag, FPreg;
2852 NodeTys.push_back(MVT::f64); // Return register
2853 NodeTys.push_back(MVT::Flag); // Returns a flag for later insns
2854 Result = DAG.getNode(PPCISD::MFFS, NodeTys, &InFlag, 0);
2855 MFFSreg = Result.getValue(0);
2856 InFlag = Result.getValue(1);
2859 NodeTys.push_back(MVT::Flag); // Returns a flag
2860 Ops[0] = DAG.getConstant(31, MVT::i32);
2862 Result = DAG.getNode(PPCISD::MTFSB1, NodeTys, Ops, 2);
2863 InFlag = Result.getValue(0);
2866 NodeTys.push_back(MVT::Flag); // Returns a flag
2867 Ops[0] = DAG.getConstant(30, MVT::i32);
2869 Result = DAG.getNode(PPCISD::MTFSB0, NodeTys, Ops, 2);
2870 InFlag = Result.getValue(0);
2873 NodeTys.push_back(MVT::f64); // result of add
2874 NodeTys.push_back(MVT::Flag); // Returns a flag
2878 Result = DAG.getNode(PPCISD::FADDRTZ, NodeTys, Ops, 3);
2879 FPreg = Result.getValue(0);
2880 InFlag = Result.getValue(1);
2883 NodeTys.push_back(MVT::f64);
2884 Ops[0] = DAG.getConstant(1, MVT::i32);
2888 Result = DAG.getNode(PPCISD::MTFSF, NodeTys, Ops, 4);
2889 FPreg = Result.getValue(0);
2891 // We know the low half is about to be thrown away, so just use something
2893 return DAG.getNode(ISD::BUILD_PAIR, Lo.getValueType(), FPreg, FPreg);
2896 SDValue PPCTargetLowering::LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
2897 // Don't handle ppc_fp128 here; let it be lowered to a libcall.
2898 if (Op.getValueType() != MVT::f32 && Op.getValueType() != MVT::f64)
2901 if (Op.getOperand(0).getValueType() == MVT::i64) {
2902 SDValue Bits = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, Op.getOperand(0));
2903 SDValue FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Bits);
2904 if (Op.getValueType() == MVT::f32)
2905 FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP, DAG.getIntPtrConstant(0));
2909 assert(Op.getOperand(0).getValueType() == MVT::i32 &&
2910 "Unhandled SINT_TO_FP type in custom expander!");
2911 // Since we only generate this in 64-bit mode, we can take advantage of
2912 // 64-bit registers. In particular, sign extend the input value into the
2913 // 64-bit register with extsw, store the WHOLE 64-bit value into the stack
2914 // then lfd it and fcfid it.
2915 MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
2916 int FrameIdx = FrameInfo->CreateStackObject(8, 8);
2917 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2918 SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
2920 SDValue Ext64 = DAG.getNode(PPCISD::EXTSW_32, MVT::i32,
2923 // STD the extended value into the stack slot.
2924 MachineMemOperand MO(PseudoSourceValue::getFixedStack(FrameIdx),
2925 MachineMemOperand::MOStore, 0, 8, 8);
2926 SDValue Store = DAG.getNode(PPCISD::STD_32, MVT::Other,
2927 DAG.getEntryNode(), Ext64, FIdx,
2928 DAG.getMemOperand(MO));
2929 // Load the value as a double.
2930 SDValue Ld = DAG.getLoad(MVT::f64, Store, FIdx, NULL, 0);
2932 // FCFID it and return it.
2933 SDValue FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Ld);
2934 if (Op.getValueType() == MVT::f32)
2935 FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP, DAG.getIntPtrConstant(0));
2939 SDValue PPCTargetLowering::LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) {
2941 The rounding mode is in bits 30:31 of FPSR, and has the following
2948 FLT_ROUNDS, on the other hand, expects the following:
2955 To perform the conversion, we do:
2956 ((FPSCR & 0x3) ^ ((~FPSCR & 0x3) >> 1))
2959 MachineFunction &MF = DAG.getMachineFunction();
2960 MVT VT = Op.getValueType();
2961 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2962 std::vector<MVT> NodeTys;
2963 SDValue MFFSreg, InFlag;
2965 // Save FP Control Word to register
2966 NodeTys.push_back(MVT::f64); // return register
2967 NodeTys.push_back(MVT::Flag); // unused in this context
2968 SDValue Chain = DAG.getNode(PPCISD::MFFS, NodeTys, &InFlag, 0);
2970 // Save FP register to stack slot
2971 int SSFI = MF.getFrameInfo()->CreateStackObject(8, 8);
2972 SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
2973 SDValue Store = DAG.getStore(DAG.getEntryNode(), Chain,
2974 StackSlot, NULL, 0);
2976 // Load FP Control Word from low 32 bits of stack slot.
2977 SDValue Four = DAG.getConstant(4, PtrVT);
2978 SDValue Addr = DAG.getNode(ISD::ADD, PtrVT, StackSlot, Four);
2979 SDValue CWD = DAG.getLoad(MVT::i32, Store, Addr, NULL, 0);
2981 // Transform as necessary
2983 DAG.getNode(ISD::AND, MVT::i32,
2984 CWD, DAG.getConstant(3, MVT::i32));
2986 DAG.getNode(ISD::SRL, MVT::i32,
2987 DAG.getNode(ISD::AND, MVT::i32,
2988 DAG.getNode(ISD::XOR, MVT::i32,
2989 CWD, DAG.getConstant(3, MVT::i32)),
2990 DAG.getConstant(3, MVT::i32)),
2991 DAG.getConstant(1, MVT::i8));
2994 DAG.getNode(ISD::XOR, MVT::i32, CWD1, CWD2);
2996 return DAG.getNode((VT.getSizeInBits() < 16 ?
2997 ISD::TRUNCATE : ISD::ZERO_EXTEND), VT, RetVal);
3000 SDValue PPCTargetLowering::LowerSHL_PARTS(SDValue Op, SelectionDAG &DAG) {
3001 MVT VT = Op.getValueType();
3002 unsigned BitWidth = VT.getSizeInBits();
3003 assert(Op.getNumOperands() == 3 &&
3004 VT == Op.getOperand(1).getValueType() &&
3007 // Expand into a bunch of logical ops. Note that these ops
3008 // depend on the PPC behavior for oversized shift amounts.
3009 SDValue Lo = Op.getOperand(0);
3010 SDValue Hi = Op.getOperand(1);
3011 SDValue Amt = Op.getOperand(2);
3012 MVT AmtVT = Amt.getValueType();
3014 SDValue Tmp1 = DAG.getNode(ISD::SUB, AmtVT,
3015 DAG.getConstant(BitWidth, AmtVT), Amt);
3016 SDValue Tmp2 = DAG.getNode(PPCISD::SHL, VT, Hi, Amt);
3017 SDValue Tmp3 = DAG.getNode(PPCISD::SRL, VT, Lo, Tmp1);
3018 SDValue Tmp4 = DAG.getNode(ISD::OR , VT, Tmp2, Tmp3);
3019 SDValue Tmp5 = DAG.getNode(ISD::ADD, AmtVT, Amt,
3020 DAG.getConstant(-BitWidth, AmtVT));
3021 SDValue Tmp6 = DAG.getNode(PPCISD::SHL, VT, Lo, Tmp5);
3022 SDValue OutHi = DAG.getNode(ISD::OR, VT, Tmp4, Tmp6);
3023 SDValue OutLo = DAG.getNode(PPCISD::SHL, VT, Lo, Amt);
3024 SDValue OutOps[] = { OutLo, OutHi };
3025 return DAG.getMergeValues(OutOps, 2);
3028 SDValue PPCTargetLowering::LowerSRL_PARTS(SDValue Op, SelectionDAG &DAG) {
3029 MVT VT = Op.getValueType();
3030 unsigned BitWidth = VT.getSizeInBits();
3031 assert(Op.getNumOperands() == 3 &&
3032 VT == Op.getOperand(1).getValueType() &&
3035 // Expand into a bunch of logical ops. Note that these ops
3036 // depend on the PPC behavior for oversized shift amounts.
3037 SDValue Lo = Op.getOperand(0);
3038 SDValue Hi = Op.getOperand(1);
3039 SDValue Amt = Op.getOperand(2);
3040 MVT AmtVT = Amt.getValueType();
3042 SDValue Tmp1 = DAG.getNode(ISD::SUB, AmtVT,
3043 DAG.getConstant(BitWidth, AmtVT), Amt);
3044 SDValue Tmp2 = DAG.getNode(PPCISD::SRL, VT, Lo, Amt);
3045 SDValue Tmp3 = DAG.getNode(PPCISD::SHL, VT, Hi, Tmp1);
3046 SDValue Tmp4 = DAG.getNode(ISD::OR , VT, Tmp2, Tmp3);
3047 SDValue Tmp5 = DAG.getNode(ISD::ADD, AmtVT, Amt,
3048 DAG.getConstant(-BitWidth, AmtVT));
3049 SDValue Tmp6 = DAG.getNode(PPCISD::SRL, VT, Hi, Tmp5);
3050 SDValue OutLo = DAG.getNode(ISD::OR, VT, Tmp4, Tmp6);
3051 SDValue OutHi = DAG.getNode(PPCISD::SRL, VT, Hi, Amt);
3052 SDValue OutOps[] = { OutLo, OutHi };
3053 return DAG.getMergeValues(OutOps, 2);
3056 SDValue PPCTargetLowering::LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG) {
3057 MVT VT = Op.getValueType();
3058 unsigned BitWidth = VT.getSizeInBits();
3059 assert(Op.getNumOperands() == 3 &&
3060 VT == Op.getOperand(1).getValueType() &&
3063 // Expand into a bunch of logical ops, followed by a select_cc.
3064 SDValue Lo = Op.getOperand(0);
3065 SDValue Hi = Op.getOperand(1);
3066 SDValue Amt = Op.getOperand(2);
3067 MVT AmtVT = Amt.getValueType();
3069 SDValue Tmp1 = DAG.getNode(ISD::SUB, AmtVT,
3070 DAG.getConstant(BitWidth, AmtVT), Amt);
3071 SDValue Tmp2 = DAG.getNode(PPCISD::SRL, VT, Lo, Amt);
3072 SDValue Tmp3 = DAG.getNode(PPCISD::SHL, VT, Hi, Tmp1);
3073 SDValue Tmp4 = DAG.getNode(ISD::OR , VT, Tmp2, Tmp3);
3074 SDValue Tmp5 = DAG.getNode(ISD::ADD, AmtVT, Amt,
3075 DAG.getConstant(-BitWidth, AmtVT));
3076 SDValue Tmp6 = DAG.getNode(PPCISD::SRA, VT, Hi, Tmp5);
3077 SDValue OutHi = DAG.getNode(PPCISD::SRA, VT, Hi, Amt);
3078 SDValue OutLo = DAG.getSelectCC(Tmp5, DAG.getConstant(0, AmtVT),
3079 Tmp4, Tmp6, ISD::SETLE);
3080 SDValue OutOps[] = { OutLo, OutHi };
3081 return DAG.getMergeValues(OutOps, 2);
3084 //===----------------------------------------------------------------------===//
3085 // Vector related lowering.
3088 // If this is a vector of constants or undefs, get the bits. A bit in
3089 // UndefBits is set if the corresponding element of the vector is an
3090 // ISD::UNDEF value. For undefs, the corresponding VectorBits values are
3091 // zero. Return true if this is not an array of constants, false if it is.
3093 static bool GetConstantBuildVectorBits(SDNode *BV, uint64_t VectorBits[2],
3094 uint64_t UndefBits[2]) {
3095 // Start with zero'd results.
3096 VectorBits[0] = VectorBits[1] = UndefBits[0] = UndefBits[1] = 0;
3098 unsigned EltBitSize = BV->getOperand(0).getValueType().getSizeInBits();
3099 for (unsigned i = 0, e = BV->getNumOperands(); i != e; ++i) {
3100 SDValue OpVal = BV->getOperand(i);
3102 unsigned PartNo = i >= e/2; // In the upper 128 bits?
3103 unsigned SlotNo = e/2 - (i & (e/2-1))-1; // Which subpiece of the uint64_t.
3105 uint64_t EltBits = 0;
3106 if (OpVal.getOpcode() == ISD::UNDEF) {
3107 uint64_t EltUndefBits = ~0U >> (32-EltBitSize);
3108 UndefBits[PartNo] |= EltUndefBits << (SlotNo*EltBitSize);
3110 } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
3111 EltBits = CN->getValue() & (~0U >> (32-EltBitSize));
3112 } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
3113 assert(CN->getValueType(0) == MVT::f32 &&
3114 "Only one legal FP vector type!");
3115 EltBits = FloatToBits(CN->getValueAPF().convertToFloat());
3117 // Nonconstant element.
3121 VectorBits[PartNo] |= EltBits << (SlotNo*EltBitSize);
3124 //printf("%llx %llx %llx %llx\n",
3125 // VectorBits[0], VectorBits[1], UndefBits[0], UndefBits[1]);
3129 // If this is a splat (repetition) of a value across the whole vector, return
3130 // the smallest size that splats it. For example, "0x01010101010101..." is a
3131 // splat of 0x01, 0x0101, and 0x01010101. We return SplatBits = 0x01 and
3132 // SplatSize = 1 byte.
3133 static bool isConstantSplat(const uint64_t Bits128[2],
3134 const uint64_t Undef128[2],
3135 unsigned &SplatBits, unsigned &SplatUndef,
3136 unsigned &SplatSize) {
3138 // Don't let undefs prevent splats from matching. See if the top 64-bits are
3139 // the same as the lower 64-bits, ignoring undefs.
3140 if ((Bits128[0] & ~Undef128[1]) != (Bits128[1] & ~Undef128[0]))
3141 return false; // Can't be a splat if two pieces don't match.
3143 uint64_t Bits64 = Bits128[0] | Bits128[1];
3144 uint64_t Undef64 = Undef128[0] & Undef128[1];
3146 // Check that the top 32-bits are the same as the lower 32-bits, ignoring
3148 if ((Bits64 & (~Undef64 >> 32)) != ((Bits64 >> 32) & ~Undef64))
3149 return false; // Can't be a splat if two pieces don't match.
3151 uint32_t Bits32 = uint32_t(Bits64) | uint32_t(Bits64 >> 32);
3152 uint32_t Undef32 = uint32_t(Undef64) & uint32_t(Undef64 >> 32);
3154 // If the top 16-bits are different than the lower 16-bits, ignoring
3155 // undefs, we have an i32 splat.
3156 if ((Bits32 & (~Undef32 >> 16)) != ((Bits32 >> 16) & ~Undef32)) {
3158 SplatUndef = Undef32;
3163 uint16_t Bits16 = uint16_t(Bits32) | uint16_t(Bits32 >> 16);
3164 uint16_t Undef16 = uint16_t(Undef32) & uint16_t(Undef32 >> 16);
3166 // If the top 8-bits are different than the lower 8-bits, ignoring
3167 // undefs, we have an i16 splat.
3168 if ((Bits16 & (uint16_t(~Undef16) >> 8)) != ((Bits16 >> 8) & ~Undef16)) {
3170 SplatUndef = Undef16;
3175 // Otherwise, we have an 8-bit splat.
3176 SplatBits = uint8_t(Bits16) | uint8_t(Bits16 >> 8);
3177 SplatUndef = uint8_t(Undef16) & uint8_t(Undef16 >> 8);
3182 /// BuildSplatI - Build a canonical splati of Val with an element size of
3183 /// SplatSize. Cast the result to VT.
3184 static SDValue BuildSplatI(int Val, unsigned SplatSize, MVT VT,
3185 SelectionDAG &DAG) {
3186 assert(Val >= -16 && Val <= 15 && "vsplti is out of range!");
3188 static const MVT VTys[] = { // canonical VT to use for each size.
3189 MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
3192 MVT ReqVT = VT != MVT::Other ? VT : VTys[SplatSize-1];
3194 // Force vspltis[hw] -1 to vspltisb -1 to canonicalize.
3198 MVT CanonicalVT = VTys[SplatSize-1];
3200 // Build a canonical splat for this value.
3201 SDValue Elt = DAG.getConstant(Val, CanonicalVT.getVectorElementType());
3202 SmallVector<SDValue, 8> Ops;
3203 Ops.assign(CanonicalVT.getVectorNumElements(), Elt);
3204 SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, CanonicalVT,
3205 &Ops[0], Ops.size());
3206 return DAG.getNode(ISD::BIT_CONVERT, ReqVT, Res);
3209 /// BuildIntrinsicOp - Return a binary operator intrinsic node with the
3210 /// specified intrinsic ID.
3211 static SDValue BuildIntrinsicOp(unsigned IID, SDValue LHS, SDValue RHS,
3213 MVT DestVT = MVT::Other) {
3214 if (DestVT == MVT::Other) DestVT = LHS.getValueType();
3215 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DestVT,
3216 DAG.getConstant(IID, MVT::i32), LHS, RHS);
3219 /// BuildIntrinsicOp - Return a ternary operator intrinsic node with the
3220 /// specified intrinsic ID.
3221 static SDValue BuildIntrinsicOp(unsigned IID, SDValue Op0, SDValue Op1,
3222 SDValue Op2, SelectionDAG &DAG,
3223 MVT DestVT = MVT::Other) {
3224 if (DestVT == MVT::Other) DestVT = Op0.getValueType();
3225 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DestVT,
3226 DAG.getConstant(IID, MVT::i32), Op0, Op1, Op2);
3230 /// BuildVSLDOI - Return a VECTOR_SHUFFLE that is a vsldoi of the specified
3231 /// amount. The result has the specified value type.
3232 static SDValue BuildVSLDOI(SDValue LHS, SDValue RHS, unsigned Amt,
3233 MVT VT, SelectionDAG &DAG) {
3234 // Force LHS/RHS to be the right type.
3235 LHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, LHS);
3236 RHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, RHS);
3239 for (unsigned i = 0; i != 16; ++i)
3240 Ops[i] = DAG.getConstant(i+Amt, MVT::i8);
3241 SDValue T = DAG.getNode(ISD::VECTOR_SHUFFLE, MVT::v16i8, LHS, RHS,
3242 DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops,16));
3243 return DAG.getNode(ISD::BIT_CONVERT, VT, T);
3246 // If this is a case we can't handle, return null and let the default
3247 // expansion code take care of it. If we CAN select this case, and if it
3248 // selects to a single instruction, return Op. Otherwise, if we can codegen
3249 // this case more efficiently than a constant pool load, lower it to the
3250 // sequence of ops that should be used.
3251 SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op,
3252 SelectionDAG &DAG) {
3253 // If this is a vector of constants or undefs, get the bits. A bit in
3254 // UndefBits is set if the corresponding element of the vector is an
3255 // ISD::UNDEF value. For undefs, the corresponding VectorBits values are
3257 uint64_t VectorBits[2];
3258 uint64_t UndefBits[2];
3259 if (GetConstantBuildVectorBits(Op.getNode(), VectorBits, UndefBits))
3260 return SDValue(); // Not a constant vector.
3262 // If this is a splat (repetition) of a value across the whole vector, return
3263 // the smallest size that splats it. For example, "0x01010101010101..." is a
3264 // splat of 0x01, 0x0101, and 0x01010101. We return SplatBits = 0x01 and
3265 // SplatSize = 1 byte.
3266 unsigned SplatBits, SplatUndef, SplatSize;
3267 if (isConstantSplat(VectorBits, UndefBits, SplatBits, SplatUndef, SplatSize)){
3268 bool HasAnyUndefs = (UndefBits[0] | UndefBits[1]) != 0;
3270 // First, handle single instruction cases.
3273 if (SplatBits == 0) {
3274 // Canonicalize all zero vectors to be v4i32.
3275 if (Op.getValueType() != MVT::v4i32 || HasAnyUndefs) {
3276 SDValue Z = DAG.getConstant(0, MVT::i32);
3277 Z = DAG.getNode(ISD::BUILD_VECTOR, MVT::v4i32, Z, Z, Z, Z);
3278 Op = DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Z);
3283 // If the sign extended value is in the range [-16,15], use VSPLTI[bhw].
3284 int32_t SextVal= int32_t(SplatBits << (32-8*SplatSize)) >> (32-8*SplatSize);
3285 if (SextVal >= -16 && SextVal <= 15)
3286 return BuildSplatI(SextVal, SplatSize, Op.getValueType(), DAG);
3289 // Two instruction sequences.
3291 // If this value is in the range [-32,30] and is even, use:
3292 // tmp = VSPLTI[bhw], result = add tmp, tmp
3293 if (SextVal >= -32 && SextVal <= 30 && (SextVal & 1) == 0) {
3294 SDValue Res = BuildSplatI(SextVal >> 1, SplatSize, MVT::Other, DAG);
3295 Res = DAG.getNode(ISD::ADD, Res.getValueType(), Res, Res);
3296 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
3299 // If this is 0x8000_0000 x 4, turn into vspltisw + vslw. If it is
3300 // 0x7FFF_FFFF x 4, turn it into not(0x8000_0000). This is important
3302 if (SplatSize == 4 && SplatBits == (0x7FFFFFFF&~SplatUndef)) {
3303 // Make -1 and vspltisw -1:
3304 SDValue OnesV = BuildSplatI(-1, 4, MVT::v4i32, DAG);
3306 // Make the VSLW intrinsic, computing 0x8000_0000.
3307 SDValue Res = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, OnesV,
3310 // xor by OnesV to invert it.
3311 Res = DAG.getNode(ISD::XOR, MVT::v4i32, Res, OnesV);
3312 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
3315 // Check to see if this is a wide variety of vsplti*, binop self cases.
3316 unsigned SplatBitSize = SplatSize*8;
3317 static const signed char SplatCsts[] = {
3318 -1, 1, -2, 2, -3, 3, -4, 4, -5, 5, -6, 6, -7, 7,
3319 -8, 8, -9, 9, -10, 10, -11, 11, -12, 12, -13, 13, 14, -14, 15, -15, -16
3322 for (unsigned idx = 0; idx < array_lengthof(SplatCsts); ++idx) {
3323 // Indirect through the SplatCsts array so that we favor 'vsplti -1' for
3324 // cases which are ambiguous (e.g. formation of 0x8000_0000). 'vsplti -1'
3325 int i = SplatCsts[idx];
3327 // Figure out what shift amount will be used by altivec if shifted by i in
3329 unsigned TypeShiftAmt = i & (SplatBitSize-1);
3331 // vsplti + shl self.
3332 if (SextVal == (i << (int)TypeShiftAmt)) {
3333 SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG);
3334 static const unsigned IIDs[] = { // Intrinsic to use for each size.
3335 Intrinsic::ppc_altivec_vslb, Intrinsic::ppc_altivec_vslh, 0,
3336 Intrinsic::ppc_altivec_vslw
3338 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG);
3339 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
3342 // vsplti + srl self.
3343 if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
3344 SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG);
3345 static const unsigned IIDs[] = { // Intrinsic to use for each size.
3346 Intrinsic::ppc_altivec_vsrb, Intrinsic::ppc_altivec_vsrh, 0,
3347 Intrinsic::ppc_altivec_vsrw
3349 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG);
3350 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
3353 // vsplti + sra self.
3354 if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
3355 SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG);
3356 static const unsigned IIDs[] = { // Intrinsic to use for each size.
3357 Intrinsic::ppc_altivec_vsrab, Intrinsic::ppc_altivec_vsrah, 0,
3358 Intrinsic::ppc_altivec_vsraw
3360 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG);
3361 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
3364 // vsplti + rol self.
3365 if (SextVal == (int)(((unsigned)i << TypeShiftAmt) |
3366 ((unsigned)i >> (SplatBitSize-TypeShiftAmt)))) {
3367 SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG);
3368 static const unsigned IIDs[] = { // Intrinsic to use for each size.
3369 Intrinsic::ppc_altivec_vrlb, Intrinsic::ppc_altivec_vrlh, 0,
3370 Intrinsic::ppc_altivec_vrlw
3372 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG);
3373 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
3376 // t = vsplti c, result = vsldoi t, t, 1
3377 if (SextVal == ((i << 8) | (i >> (TypeShiftAmt-8)))) {
3378 SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
3379 return BuildVSLDOI(T, T, 1, Op.getValueType(), DAG);
3381 // t = vsplti c, result = vsldoi t, t, 2
3382 if (SextVal == ((i << 16) | (i >> (TypeShiftAmt-16)))) {
3383 SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
3384 return BuildVSLDOI(T, T, 2, Op.getValueType(), DAG);
3386 // t = vsplti c, result = vsldoi t, t, 3
3387 if (SextVal == ((i << 24) | (i >> (TypeShiftAmt-24)))) {
3388 SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
3389 return BuildVSLDOI(T, T, 3, Op.getValueType(), DAG);
3393 // Three instruction sequences.
3395 // Odd, in range [17,31]: (vsplti C)-(vsplti -16).
3396 if (SextVal >= 0 && SextVal <= 31) {
3397 SDValue LHS = BuildSplatI(SextVal-16, SplatSize, MVT::Other, DAG);
3398 SDValue RHS = BuildSplatI(-16, SplatSize, MVT::Other, DAG);
3399 LHS = DAG.getNode(ISD::SUB, LHS.getValueType(), LHS, RHS);
3400 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), LHS);
3402 // Odd, in range [-31,-17]: (vsplti C)+(vsplti -16).
3403 if (SextVal >= -31 && SextVal <= 0) {
3404 SDValue LHS = BuildSplatI(SextVal+16, SplatSize, MVT::Other, DAG);
3405 SDValue RHS = BuildSplatI(-16, SplatSize, MVT::Other, DAG);
3406 LHS = DAG.getNode(ISD::ADD, LHS.getValueType(), LHS, RHS);
3407 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), LHS);
3414 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
3415 /// the specified operations to build the shuffle.
3416 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
3417 SDValue RHS, SelectionDAG &DAG) {
3418 unsigned OpNum = (PFEntry >> 26) & 0x0F;
3419 unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
3420 unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
3423 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
3435 if (OpNum == OP_COPY) {
3436 if (LHSID == (1*9+2)*9+3) return LHS;
3437 assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
3441 SDValue OpLHS, OpRHS;
3442 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG);
3443 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG);
3445 unsigned ShufIdxs[16];
3447 default: assert(0 && "Unknown i32 permute!");
3449 ShufIdxs[ 0] = 0; ShufIdxs[ 1] = 1; ShufIdxs[ 2] = 2; ShufIdxs[ 3] = 3;
3450 ShufIdxs[ 4] = 16; ShufIdxs[ 5] = 17; ShufIdxs[ 6] = 18; ShufIdxs[ 7] = 19;
3451 ShufIdxs[ 8] = 4; ShufIdxs[ 9] = 5; ShufIdxs[10] = 6; ShufIdxs[11] = 7;
3452 ShufIdxs[12] = 20; ShufIdxs[13] = 21; ShufIdxs[14] = 22; ShufIdxs[15] = 23;
3455 ShufIdxs[ 0] = 8; ShufIdxs[ 1] = 9; ShufIdxs[ 2] = 10; ShufIdxs[ 3] = 11;
3456 ShufIdxs[ 4] = 24; ShufIdxs[ 5] = 25; ShufIdxs[ 6] = 26; ShufIdxs[ 7] = 27;
3457 ShufIdxs[ 8] = 12; ShufIdxs[ 9] = 13; ShufIdxs[10] = 14; ShufIdxs[11] = 15;
3458 ShufIdxs[12] = 28; ShufIdxs[13] = 29; ShufIdxs[14] = 30; ShufIdxs[15] = 31;
3461 for (unsigned i = 0; i != 16; ++i)
3462 ShufIdxs[i] = (i&3)+0;
3465 for (unsigned i = 0; i != 16; ++i)
3466 ShufIdxs[i] = (i&3)+4;
3469 for (unsigned i = 0; i != 16; ++i)
3470 ShufIdxs[i] = (i&3)+8;
3473 for (unsigned i = 0; i != 16; ++i)
3474 ShufIdxs[i] = (i&3)+12;
3477 return BuildVSLDOI(OpLHS, OpRHS, 4, OpLHS.getValueType(), DAG);
3479 return BuildVSLDOI(OpLHS, OpRHS, 8, OpLHS.getValueType(), DAG);
3481 return BuildVSLDOI(OpLHS, OpRHS, 12, OpLHS.getValueType(), DAG);
3484 for (unsigned i = 0; i != 16; ++i)
3485 Ops[i] = DAG.getConstant(ShufIdxs[i], MVT::i8);
3487 return DAG.getNode(ISD::VECTOR_SHUFFLE, OpLHS.getValueType(), OpLHS, OpRHS,
3488 DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops, 16));
3491 /// LowerVECTOR_SHUFFLE - Return the code we lower for VECTOR_SHUFFLE. If this
3492 /// is a shuffle we can handle in a single instruction, return it. Otherwise,
3493 /// return the code it can be lowered into. Worst case, it can always be
3494 /// lowered into a vperm.
3495 SDValue PPCTargetLowering::LowerVECTOR_SHUFFLE(SDValue Op,
3496 SelectionDAG &DAG) {
3497 SDValue V1 = Op.getOperand(0);
3498 SDValue V2 = Op.getOperand(1);
3499 SDValue PermMask = Op.getOperand(2);
3501 // Cases that are handled by instructions that take permute immediates
3502 // (such as vsplt*) should be left as VECTOR_SHUFFLE nodes so they can be
3503 // selected by the instruction selector.
3504 if (V2.getOpcode() == ISD::UNDEF) {
3505 if (PPC::isSplatShuffleMask(PermMask.getNode(), 1) ||
3506 PPC::isSplatShuffleMask(PermMask.getNode(), 2) ||
3507 PPC::isSplatShuffleMask(PermMask.getNode(), 4) ||
3508 PPC::isVPKUWUMShuffleMask(PermMask.getNode(), true) ||
3509 PPC::isVPKUHUMShuffleMask(PermMask.getNode(), true) ||
3510 PPC::isVSLDOIShuffleMask(PermMask.getNode(), true) != -1 ||
3511 PPC::isVMRGLShuffleMask(PermMask.getNode(), 1, true) ||
3512 PPC::isVMRGLShuffleMask(PermMask.getNode(), 2, true) ||
3513 PPC::isVMRGLShuffleMask(PermMask.getNode(), 4, true) ||
3514 PPC::isVMRGHShuffleMask(PermMask.getNode(), 1, true) ||
3515 PPC::isVMRGHShuffleMask(PermMask.getNode(), 2, true) ||
3516 PPC::isVMRGHShuffleMask(PermMask.getNode(), 4, true)) {
3521 // Altivec has a variety of "shuffle immediates" that take two vector inputs
3522 // and produce a fixed permutation. If any of these match, do not lower to
3524 if (PPC::isVPKUWUMShuffleMask(PermMask.getNode(), false) ||
3525 PPC::isVPKUHUMShuffleMask(PermMask.getNode(), false) ||
3526 PPC::isVSLDOIShuffleMask(PermMask.getNode(), false) != -1 ||
3527 PPC::isVMRGLShuffleMask(PermMask.getNode(), 1, false) ||
3528 PPC::isVMRGLShuffleMask(PermMask.getNode(), 2, false) ||
3529 PPC::isVMRGLShuffleMask(PermMask.getNode(), 4, false) ||
3530 PPC::isVMRGHShuffleMask(PermMask.getNode(), 1, false) ||
3531 PPC::isVMRGHShuffleMask(PermMask.getNode(), 2, false) ||
3532 PPC::isVMRGHShuffleMask(PermMask.getNode(), 4, false))
3535 // Check to see if this is a shuffle of 4-byte values. If so, we can use our
3536 // perfect shuffle table to emit an optimal matching sequence.
3537 unsigned PFIndexes[4];
3538 bool isFourElementShuffle = true;
3539 for (unsigned i = 0; i != 4 && isFourElementShuffle; ++i) { // Element number
3540 unsigned EltNo = 8; // Start out undef.
3541 for (unsigned j = 0; j != 4; ++j) { // Intra-element byte.
3542 if (PermMask.getOperand(i*4+j).getOpcode() == ISD::UNDEF)
3543 continue; // Undef, ignore it.
3545 unsigned ByteSource =
3546 cast<ConstantSDNode>(PermMask.getOperand(i*4+j))->getValue();
3547 if ((ByteSource & 3) != j) {
3548 isFourElementShuffle = false;
3553 EltNo = ByteSource/4;
3554 } else if (EltNo != ByteSource/4) {
3555 isFourElementShuffle = false;
3559 PFIndexes[i] = EltNo;
3562 // If this shuffle can be expressed as a shuffle of 4-byte elements, use the
3563 // perfect shuffle vector to determine if it is cost effective to do this as
3564 // discrete instructions, or whether we should use a vperm.
3565 if (isFourElementShuffle) {
3566 // Compute the index in the perfect shuffle table.
3567 unsigned PFTableIndex =
3568 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
3570 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
3571 unsigned Cost = (PFEntry >> 30);
3573 // Determining when to avoid vperm is tricky. Many things affect the cost
3574 // of vperm, particularly how many times the perm mask needs to be computed.
3575 // For example, if the perm mask can be hoisted out of a loop or is already
3576 // used (perhaps because there are multiple permutes with the same shuffle
3577 // mask?) the vperm has a cost of 1. OTOH, hoisting the permute mask out of
3578 // the loop requires an extra register.
3580 // As a compromise, we only emit discrete instructions if the shuffle can be
3581 // generated in 3 or fewer operations. When we have loop information
3582 // available, if this block is within a loop, we should avoid using vperm
3583 // for 3-operation perms and use a constant pool load instead.
3585 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG);
3588 // Lower this to a VPERM(V1, V2, V3) expression, where V3 is a constant
3589 // vector that will get spilled to the constant pool.
3590 if (V2.getOpcode() == ISD::UNDEF) V2 = V1;
3592 // The SHUFFLE_VECTOR mask is almost exactly what we want for vperm, except
3593 // that it is in input element units, not in bytes. Convert now.
3594 MVT EltVT = V1.getValueType().getVectorElementType();
3595 unsigned BytesPerElement = EltVT.getSizeInBits()/8;
3597 SmallVector<SDValue, 16> ResultMask;
3598 for (unsigned i = 0, e = PermMask.getNumOperands(); i != e; ++i) {
3600 if (PermMask.getOperand(i).getOpcode() == ISD::UNDEF)
3603 SrcElt = cast<ConstantSDNode>(PermMask.getOperand(i))->getValue();
3605 for (unsigned j = 0; j != BytesPerElement; ++j)
3606 ResultMask.push_back(DAG.getConstant(SrcElt*BytesPerElement+j,
3610 SDValue VPermMask = DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8,
3611 &ResultMask[0], ResultMask.size());
3612 return DAG.getNode(PPCISD::VPERM, V1.getValueType(), V1, V2, VPermMask);
3615 /// getAltivecCompareInfo - Given an intrinsic, return false if it is not an
3616 /// altivec comparison. If it is, return true and fill in Opc/isDot with
3617 /// information about the intrinsic.
3618 static bool getAltivecCompareInfo(SDValue Intrin, int &CompareOpc,
3620 unsigned IntrinsicID = cast<ConstantSDNode>(Intrin.getOperand(0))->getValue();
3623 switch (IntrinsicID) {
3624 default: return false;
3625 // Comparison predicates.
3626 case Intrinsic::ppc_altivec_vcmpbfp_p: CompareOpc = 966; isDot = 1; break;
3627 case Intrinsic::ppc_altivec_vcmpeqfp_p: CompareOpc = 198; isDot = 1; break;
3628 case Intrinsic::ppc_altivec_vcmpequb_p: CompareOpc = 6; isDot = 1; break;
3629 case Intrinsic::ppc_altivec_vcmpequh_p: CompareOpc = 70; isDot = 1; break;
3630 case Intrinsic::ppc_altivec_vcmpequw_p: CompareOpc = 134; isDot = 1; break;
3631 case Intrinsic::ppc_altivec_vcmpgefp_p: CompareOpc = 454; isDot = 1; break;
3632 case Intrinsic::ppc_altivec_vcmpgtfp_p: CompareOpc = 710; isDot = 1; break;
3633 case Intrinsic::ppc_altivec_vcmpgtsb_p: CompareOpc = 774; isDot = 1; break;
3634 case Intrinsic::ppc_altivec_vcmpgtsh_p: CompareOpc = 838; isDot = 1; break;
3635 case Intrinsic::ppc_altivec_vcmpgtsw_p: CompareOpc = 902; isDot = 1; break;
3636 case Intrinsic::ppc_altivec_vcmpgtub_p: CompareOpc = 518; isDot = 1; break;
3637 case Intrinsic::ppc_altivec_vcmpgtuh_p: CompareOpc = 582; isDot = 1; break;
3638 case Intrinsic::ppc_altivec_vcmpgtuw_p: CompareOpc = 646; isDot = 1; break;
3640 // Normal Comparisons.
3641 case Intrinsic::ppc_altivec_vcmpbfp: CompareOpc = 966; isDot = 0; break;
3642 case Intrinsic::ppc_altivec_vcmpeqfp: CompareOpc = 198; isDot = 0; break;
3643 case Intrinsic::ppc_altivec_vcmpequb: CompareOpc = 6; isDot = 0; break;
3644 case Intrinsic::ppc_altivec_vcmpequh: CompareOpc = 70; isDot = 0; break;
3645 case Intrinsic::ppc_altivec_vcmpequw: CompareOpc = 134; isDot = 0; break;
3646 case Intrinsic::ppc_altivec_vcmpgefp: CompareOpc = 454; isDot = 0; break;
3647 case Intrinsic::ppc_altivec_vcmpgtfp: CompareOpc = 710; isDot = 0; break;
3648 case Intrinsic::ppc_altivec_vcmpgtsb: CompareOpc = 774; isDot = 0; break;
3649 case Intrinsic::ppc_altivec_vcmpgtsh: CompareOpc = 838; isDot = 0; break;
3650 case Intrinsic::ppc_altivec_vcmpgtsw: CompareOpc = 902; isDot = 0; break;
3651 case Intrinsic::ppc_altivec_vcmpgtub: CompareOpc = 518; isDot = 0; break;
3652 case Intrinsic::ppc_altivec_vcmpgtuh: CompareOpc = 582; isDot = 0; break;
3653 case Intrinsic::ppc_altivec_vcmpgtuw: CompareOpc = 646; isDot = 0; break;
3658 /// LowerINTRINSIC_WO_CHAIN - If this is an intrinsic that we want to custom
3659 /// lower, do it, otherwise return null.
3660 SDValue PPCTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
3661 SelectionDAG &DAG) {
3662 // If this is a lowered altivec predicate compare, CompareOpc is set to the
3663 // opcode number of the comparison.
3666 if (!getAltivecCompareInfo(Op, CompareOpc, isDot))
3667 return SDValue(); // Don't custom lower most intrinsics.
3669 // If this is a non-dot comparison, make the VCMP node and we are done.
3671 SDValue Tmp = DAG.getNode(PPCISD::VCMP, Op.getOperand(2).getValueType(),
3672 Op.getOperand(1), Op.getOperand(2),
3673 DAG.getConstant(CompareOpc, MVT::i32));
3674 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Tmp);
3677 // Create the PPCISD altivec 'dot' comparison node.
3679 Op.getOperand(2), // LHS
3680 Op.getOperand(3), // RHS
3681 DAG.getConstant(CompareOpc, MVT::i32)
3683 std::vector<MVT> VTs;
3684 VTs.push_back(Op.getOperand(2).getValueType());
3685 VTs.push_back(MVT::Flag);
3686 SDValue CompNode = DAG.getNode(PPCISD::VCMPo, VTs, Ops, 3);
3688 // Now that we have the comparison, emit a copy from the CR to a GPR.
3689 // This is flagged to the above dot comparison.
3690 SDValue Flags = DAG.getNode(PPCISD::MFCR, MVT::i32,
3691 DAG.getRegister(PPC::CR6, MVT::i32),
3692 CompNode.getValue(1));
3694 // Unpack the result based on how the target uses it.
3695 unsigned BitNo; // Bit # of CR6.
3696 bool InvertBit; // Invert result?
3697 switch (cast<ConstantSDNode>(Op.getOperand(1))->getValue()) {
3698 default: // Can't happen, don't crash on invalid number though.
3699 case 0: // Return the value of the EQ bit of CR6.
3700 BitNo = 0; InvertBit = false;
3702 case 1: // Return the inverted value of the EQ bit of CR6.
3703 BitNo = 0; InvertBit = true;
3705 case 2: // Return the value of the LT bit of CR6.
3706 BitNo = 2; InvertBit = false;
3708 case 3: // Return the inverted value of the LT bit of CR6.
3709 BitNo = 2; InvertBit = true;
3713 // Shift the bit into the low position.
3714 Flags = DAG.getNode(ISD::SRL, MVT::i32, Flags,
3715 DAG.getConstant(8-(3-BitNo), MVT::i32));
3717 Flags = DAG.getNode(ISD::AND, MVT::i32, Flags,
3718 DAG.getConstant(1, MVT::i32));
3720 // If we are supposed to, toggle the bit.
3722 Flags = DAG.getNode(ISD::XOR, MVT::i32, Flags,
3723 DAG.getConstant(1, MVT::i32));
3727 SDValue PPCTargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op,
3728 SelectionDAG &DAG) {
3729 // Create a stack slot that is 16-byte aligned.
3730 MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
3731 int FrameIdx = FrameInfo->CreateStackObject(16, 16);
3732 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3733 SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
3735 // Store the input value into Value#0 of the stack slot.
3736 SDValue Store = DAG.getStore(DAG.getEntryNode(),
3737 Op.getOperand(0), FIdx, NULL, 0);
3739 return DAG.getLoad(Op.getValueType(), Store, FIdx, NULL, 0);
3742 SDValue PPCTargetLowering::LowerMUL(SDValue Op, SelectionDAG &DAG) {
3743 if (Op.getValueType() == MVT::v4i32) {
3744 SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
3746 SDValue Zero = BuildSplatI( 0, 1, MVT::v4i32, DAG);
3747 SDValue Neg16 = BuildSplatI(-16, 4, MVT::v4i32, DAG); // +16 as shift amt.
3749 SDValue RHSSwap = // = vrlw RHS, 16
3750 BuildIntrinsicOp(Intrinsic::ppc_altivec_vrlw, RHS, Neg16, DAG);
3752 // Shrinkify inputs to v8i16.
3753 LHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, LHS);
3754 RHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, RHS);
3755 RHSSwap = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, RHSSwap);
3757 // Low parts multiplied together, generating 32-bit results (we ignore the
3759 SDValue LoProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmulouh,
3760 LHS, RHS, DAG, MVT::v4i32);
3762 SDValue HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmsumuhm,
3763 LHS, RHSSwap, Zero, DAG, MVT::v4i32);
3764 // Shift the high parts up 16 bits.
3765 HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, HiProd, Neg16, DAG);
3766 return DAG.getNode(ISD::ADD, MVT::v4i32, LoProd, HiProd);
3767 } else if (Op.getValueType() == MVT::v8i16) {
3768 SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
3770 SDValue Zero = BuildSplatI(0, 1, MVT::v8i16, DAG);
3772 return BuildIntrinsicOp(Intrinsic::ppc_altivec_vmladduhm,
3773 LHS, RHS, Zero, DAG);
3774 } else if (Op.getValueType() == MVT::v16i8) {
3775 SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
3777 // Multiply the even 8-bit parts, producing 16-bit sums.
3778 SDValue EvenParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuleub,
3779 LHS, RHS, DAG, MVT::v8i16);
3780 EvenParts = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, EvenParts);
3782 // Multiply the odd 8-bit parts, producing 16-bit sums.
3783 SDValue OddParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuloub,
3784 LHS, RHS, DAG, MVT::v8i16);
3785 OddParts = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, OddParts);
3787 // Merge the results together.
3789 for (unsigned i = 0; i != 8; ++i) {
3790 Ops[i*2 ] = DAG.getConstant(2*i+1, MVT::i8);
3791 Ops[i*2+1] = DAG.getConstant(2*i+1+16, MVT::i8);
3793 return DAG.getNode(ISD::VECTOR_SHUFFLE, MVT::v16i8, EvenParts, OddParts,
3794 DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops, 16));
3796 assert(0 && "Unknown mul to lower!");
3801 /// LowerOperation - Provide custom lowering hooks for some operations.
3803 SDValue PPCTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
3804 switch (Op.getOpcode()) {
3805 default: assert(0 && "Wasn't expecting to be able to lower this!");
3806 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
3807 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
3808 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
3809 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
3810 case ISD::SETCC: return LowerSETCC(Op, DAG);
3812 return LowerVASTART(Op, DAG, VarArgsFrameIndex, VarArgsStackOffset,
3813 VarArgsNumGPR, VarArgsNumFPR, PPCSubTarget);
3816 return LowerVAARG(Op, DAG, VarArgsFrameIndex, VarArgsStackOffset,
3817 VarArgsNumGPR, VarArgsNumFPR, PPCSubTarget);
3819 case ISD::FORMAL_ARGUMENTS:
3820 return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex,
3821 VarArgsStackOffset, VarArgsNumGPR,
3822 VarArgsNumFPR, PPCSubTarget);
3824 case ISD::CALL: return LowerCALL(Op, DAG, PPCSubTarget,
3825 getTargetMachine());
3826 case ISD::RET: return LowerRET(Op, DAG, getTargetMachine());
3827 case ISD::STACKRESTORE: return LowerSTACKRESTORE(Op, DAG, PPCSubTarget);
3828 case ISD::DYNAMIC_STACKALLOC:
3829 return LowerDYNAMIC_STACKALLOC(Op, DAG, PPCSubTarget);
3831 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
3832 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
3833 case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
3834 case ISD::FP_ROUND_INREG: return LowerFP_ROUND_INREG(Op, DAG);
3835 case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
3837 // Lower 64-bit shifts.
3838 case ISD::SHL_PARTS: return LowerSHL_PARTS(Op, DAG);
3839 case ISD::SRL_PARTS: return LowerSRL_PARTS(Op, DAG);
3840 case ISD::SRA_PARTS: return LowerSRA_PARTS(Op, DAG);
3842 // Vector-related lowering.
3843 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
3844 case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
3845 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
3846 case ISD::SCALAR_TO_VECTOR: return LowerSCALAR_TO_VECTOR(Op, DAG);
3847 case ISD::MUL: return LowerMUL(Op, DAG);
3849 // Frame & Return address.
3850 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
3851 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
3856 SDNode *PPCTargetLowering::ReplaceNodeResults(SDNode *N, SelectionDAG &DAG) {
3857 switch (N->getOpcode()) {
3858 default: assert(0 && "Wasn't expecting to be able to lower this!");
3859 case ISD::FP_TO_SINT: {
3860 SDValue Res = LowerFP_TO_SINT(SDValue(N, 0), DAG);
3861 // Use MERGE_VALUES to drop the chain result value and get a node with one
3862 // result. This requires turning off getMergeValues simplification, since
3863 // otherwise it will give us Res back.
3864 return DAG.getMergeValues(&Res, 1, false).getNode();
3870 //===----------------------------------------------------------------------===//
3871 // Other Lowering Code
3872 //===----------------------------------------------------------------------===//
3875 PPCTargetLowering::EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
3876 bool is64bit, unsigned BinOpcode) {
3877 // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
3878 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3880 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3881 MachineFunction *F = BB->getParent();
3882 MachineFunction::iterator It = BB;
3885 unsigned dest = MI->getOperand(0).getReg();
3886 unsigned ptrA = MI->getOperand(1).getReg();
3887 unsigned ptrB = MI->getOperand(2).getReg();
3888 unsigned incr = MI->getOperand(3).getReg();
3890 MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB);
3891 MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
3892 F->insert(It, loopMBB);
3893 F->insert(It, exitMBB);
3894 exitMBB->transferSuccessors(BB);
3896 MachineRegisterInfo &RegInfo = F->getRegInfo();
3897 unsigned TmpReg = (!BinOpcode) ? incr :
3898 RegInfo.createVirtualRegister(
3899 is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
3900 (const TargetRegisterClass *) &PPC::GPRCRegClass);
3904 // fallthrough --> loopMBB
3905 BB->addSuccessor(loopMBB);
3908 // l[wd]arx dest, ptr
3909 // add r0, dest, incr
3910 // st[wd]cx. r0, ptr
3912 // fallthrough --> exitMBB
3914 BuildMI(BB, TII->get(is64bit ? PPC::LDARX : PPC::LWARX), dest)
3915 .addReg(ptrA).addReg(ptrB);
3917 BuildMI(BB, TII->get(BinOpcode), TmpReg).addReg(incr).addReg(dest);
3918 BuildMI(BB, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
3919 .addReg(TmpReg).addReg(ptrA).addReg(ptrB);
3920 BuildMI(BB, TII->get(PPC::BCC))
3921 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loopMBB);
3922 BB->addSuccessor(loopMBB);
3923 BB->addSuccessor(exitMBB);
3932 PPCTargetLowering::EmitPartwordAtomicBinary(MachineInstr *MI,
3933 MachineBasicBlock *BB,
3934 bool is8bit, // operation
3935 unsigned BinOpcode) {
3936 // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
3937 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3938 // In 64 bit mode we have to use 64 bits for addresses, even though the
3939 // lwarx/stwcx are 32 bits. With the 32-bit atomics we can use address
3940 // registers without caring whether they're 32 or 64, but here we're
3941 // doing actual arithmetic on the addresses.
3942 bool is64bit = PPCSubTarget.isPPC64();
3944 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3945 MachineFunction *F = BB->getParent();
3946 MachineFunction::iterator It = BB;
3949 unsigned dest = MI->getOperand(0).getReg();
3950 unsigned ptrA = MI->getOperand(1).getReg();
3951 unsigned ptrB = MI->getOperand(2).getReg();
3952 unsigned incr = MI->getOperand(3).getReg();
3954 MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB);
3955 MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
3956 F->insert(It, loopMBB);
3957 F->insert(It, exitMBB);
3958 exitMBB->transferSuccessors(BB);
3960 MachineRegisterInfo &RegInfo = F->getRegInfo();
3961 const TargetRegisterClass *RC =
3962 is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
3963 (const TargetRegisterClass *) &PPC::GPRCRegClass;
3964 unsigned PtrReg = RegInfo.createVirtualRegister(RC);
3965 unsigned Shift1Reg = RegInfo.createVirtualRegister(RC);
3966 unsigned ShiftReg = RegInfo.createVirtualRegister(RC);
3967 unsigned Incr2Reg = RegInfo.createVirtualRegister(RC);
3968 unsigned MaskReg = RegInfo.createVirtualRegister(RC);
3969 unsigned Mask2Reg = RegInfo.createVirtualRegister(RC);
3970 unsigned Mask3Reg = RegInfo.createVirtualRegister(RC);
3971 unsigned Tmp2Reg = RegInfo.createVirtualRegister(RC);
3972 unsigned Tmp3Reg = RegInfo.createVirtualRegister(RC);
3973 unsigned Tmp4Reg = RegInfo.createVirtualRegister(RC);
3974 unsigned TmpDestReg = RegInfo.createVirtualRegister(RC);
3976 unsigned TmpReg = (!BinOpcode) ? Incr2Reg : RegInfo.createVirtualRegister(RC);
3980 // fallthrough --> loopMBB
3981 BB->addSuccessor(loopMBB);
3983 // The 4-byte load must be aligned, while a char or short may be
3984 // anywhere in the word. Hence all this nasty bookkeeping code.
3985 // add ptr1, ptrA, ptrB [copy if ptrA==0]
3986 // rlwinm shift1, ptr1, 3, 27, 28 [3, 27, 27]
3987 // xori shift, shift1, 24 [16]
3988 // rlwinm ptr, ptr1, 0, 0, 29
3989 // slw incr2, incr, shift
3990 // li mask2, 255 [li mask3, 0; ori mask2, mask3, 65535]
3991 // slw mask, mask2, shift
3993 // lwarx tmpDest, ptr
3994 // add tmp, tmpDest, incr2
3995 // andc tmp2, tmpDest, mask
3996 // and tmp3, tmp, mask
3997 // or tmp4, tmp3, tmp2
4000 // fallthrough --> exitMBB
4001 // srw dest, tmpDest, shift
4003 if (ptrA!=PPC::R0) {
4004 Ptr1Reg = RegInfo.createVirtualRegister(RC);
4005 BuildMI(BB, TII->get(is64bit ? PPC::ADD8 : PPC::ADD4), Ptr1Reg)
4006 .addReg(ptrA).addReg(ptrB);
4010 BuildMI(BB, TII->get(PPC::RLWINM), Shift1Reg).addReg(Ptr1Reg)
4011 .addImm(3).addImm(27).addImm(is8bit ? 28 : 27);
4012 BuildMI(BB, TII->get(is64bit ? PPC::XORI8 : PPC::XORI), ShiftReg)
4013 .addReg(Shift1Reg).addImm(is8bit ? 24 : 16);
4015 BuildMI(BB, TII->get(PPC::RLDICR), PtrReg)
4016 .addReg(Ptr1Reg).addImm(0).addImm(61);
4018 BuildMI(BB, TII->get(PPC::RLWINM), PtrReg)
4019 .addReg(Ptr1Reg).addImm(0).addImm(0).addImm(29);
4020 BuildMI(BB, TII->get(PPC::SLW), Incr2Reg)
4021 .addReg(incr).addReg(ShiftReg);
4023 BuildMI(BB, TII->get(PPC::LI), Mask2Reg).addImm(255);
4025 BuildMI(BB, TII->get(PPC::LI), Mask3Reg).addImm(0);
4026 BuildMI(BB, TII->get(PPC::ORI), Mask2Reg).addReg(Mask3Reg).addImm(65535);
4028 BuildMI(BB, TII->get(PPC::SLW), MaskReg)
4029 .addReg(Mask2Reg).addReg(ShiftReg);
4032 BuildMI(BB, TII->get(PPC::LWARX), TmpDestReg)
4033 .addReg(PPC::R0).addReg(PtrReg);
4035 BuildMI(BB, TII->get(BinOpcode), TmpReg)
4036 .addReg(Incr2Reg).addReg(TmpDestReg);
4037 BuildMI(BB, TII->get(is64bit ? PPC::ANDC8 : PPC::ANDC), Tmp2Reg)
4038 .addReg(TmpDestReg).addReg(MaskReg);
4039 BuildMI(BB, TII->get(is64bit ? PPC::AND8 : PPC::AND), Tmp3Reg)
4040 .addReg(TmpReg).addReg(MaskReg);
4041 BuildMI(BB, TII->get(is64bit ? PPC::OR8 : PPC::OR), Tmp4Reg)
4042 .addReg(Tmp3Reg).addReg(Tmp2Reg);
4043 BuildMI(BB, TII->get(PPC::STWCX))
4044 .addReg(Tmp4Reg).addReg(PPC::R0).addReg(PtrReg);
4045 BuildMI(BB, TII->get(PPC::BCC))
4046 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loopMBB);
4047 BB->addSuccessor(loopMBB);
4048 BB->addSuccessor(exitMBB);
4053 BuildMI(BB, TII->get(PPC::SRW), dest).addReg(TmpDestReg).addReg(ShiftReg);
4058 PPCTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
4059 MachineBasicBlock *BB) {
4060 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
4062 // To "insert" these instructions we actually have to insert their
4063 // control-flow patterns.
4064 const BasicBlock *LLVM_BB = BB->getBasicBlock();
4065 MachineFunction::iterator It = BB;
4068 MachineFunction *F = BB->getParent();
4070 if (MI->getOpcode() == PPC::SELECT_CC_I4 ||
4071 MI->getOpcode() == PPC::SELECT_CC_I8 ||
4072 MI->getOpcode() == PPC::SELECT_CC_F4 ||
4073 MI->getOpcode() == PPC::SELECT_CC_F8 ||
4074 MI->getOpcode() == PPC::SELECT_CC_VRRC) {
4076 // The incoming instruction knows the destination vreg to set, the
4077 // condition code register to branch on, the true/false values to
4078 // select between, and a branch opcode to use.
4083 // cmpTY ccX, r1, r2
4085 // fallthrough --> copy0MBB
4086 MachineBasicBlock *thisMBB = BB;
4087 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
4088 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
4089 unsigned SelectPred = MI->getOperand(4).getImm();
4090 BuildMI(BB, TII->get(PPC::BCC))
4091 .addImm(SelectPred).addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
4092 F->insert(It, copy0MBB);
4093 F->insert(It, sinkMBB);
4094 // Update machine-CFG edges by transferring all successors of the current
4095 // block to the new block which will contain the Phi node for the select.
4096 sinkMBB->transferSuccessors(BB);
4097 // Next, add the true and fallthrough blocks as its successors.
4098 BB->addSuccessor(copy0MBB);
4099 BB->addSuccessor(sinkMBB);
4102 // %FalseValue = ...
4103 // # fallthrough to sinkMBB
4106 // Update machine-CFG edges
4107 BB->addSuccessor(sinkMBB);
4110 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
4113 BuildMI(BB, TII->get(PPC::PHI), MI->getOperand(0).getReg())
4114 .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
4115 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
4117 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I8)
4118 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::ADD4);
4119 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I16)
4120 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::ADD4);
4121 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I32)
4122 BB = EmitAtomicBinary(MI, BB, false, PPC::ADD4);
4123 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I64)
4124 BB = EmitAtomicBinary(MI, BB, true, PPC::ADD8);
4126 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I8)
4127 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::AND);
4128 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I16)
4129 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::AND);
4130 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I32)
4131 BB = EmitAtomicBinary(MI, BB, false, PPC::AND);
4132 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I64)
4133 BB = EmitAtomicBinary(MI, BB, true, PPC::AND8);
4135 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I8)
4136 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::OR);
4137 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I16)
4138 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::OR);
4139 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I32)
4140 BB = EmitAtomicBinary(MI, BB, false, PPC::OR);
4141 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I64)
4142 BB = EmitAtomicBinary(MI, BB, true, PPC::OR8);
4144 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I8)
4145 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::XOR);
4146 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I16)
4147 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::XOR);
4148 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I32)
4149 BB = EmitAtomicBinary(MI, BB, false, PPC::XOR);
4150 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I64)
4151 BB = EmitAtomicBinary(MI, BB, true, PPC::XOR8);
4153 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I8)
4154 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::NAND);
4155 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I16)
4156 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::NAND);
4157 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I32)
4158 BB = EmitAtomicBinary(MI, BB, false, PPC::NAND);
4159 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I64)
4160 BB = EmitAtomicBinary(MI, BB, true, PPC::NAND8);
4162 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I8)
4163 BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::SUBF);
4164 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I16)
4165 BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::SUBF);
4166 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I32)
4167 BB = EmitAtomicBinary(MI, BB, false, PPC::SUBF);
4168 else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I64)
4169 BB = EmitAtomicBinary(MI, BB, true, PPC::SUBF8);
4171 else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I8)
4172 BB = EmitPartwordAtomicBinary(MI, BB, true, 0);
4173 else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I16)
4174 BB = EmitPartwordAtomicBinary(MI, BB, false, 0);
4175 else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I32)
4176 BB = EmitAtomicBinary(MI, BB, false, 0);
4177 else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I64)
4178 BB = EmitAtomicBinary(MI, BB, true, 0);
4180 else if (MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I32 ||
4181 MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I64) {
4182 bool is64bit = MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I64;
4184 unsigned dest = MI->getOperand(0).getReg();
4185 unsigned ptrA = MI->getOperand(1).getReg();
4186 unsigned ptrB = MI->getOperand(2).getReg();
4187 unsigned oldval = MI->getOperand(3).getReg();
4188 unsigned newval = MI->getOperand(4).getReg();
4190 MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB);
4191 MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB);
4192 MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
4193 MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
4194 F->insert(It, loop1MBB);
4195 F->insert(It, loop2MBB);
4196 F->insert(It, midMBB);
4197 F->insert(It, exitMBB);
4198 exitMBB->transferSuccessors(BB);
4202 // fallthrough --> loopMBB
4203 BB->addSuccessor(loop1MBB);
4206 // l[wd]arx dest, ptr
4207 // cmp[wd] dest, oldval
4210 // st[wd]cx. newval, ptr
4214 // st[wd]cx. dest, ptr
4217 BuildMI(BB, TII->get(is64bit ? PPC::LDARX : PPC::LWARX), dest)
4218 .addReg(ptrA).addReg(ptrB);
4219 BuildMI(BB, TII->get(is64bit ? PPC::CMPD : PPC::CMPW), PPC::CR0)
4220 .addReg(oldval).addReg(dest);
4221 BuildMI(BB, TII->get(PPC::BCC))
4222 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(midMBB);
4223 BB->addSuccessor(loop2MBB);
4224 BB->addSuccessor(midMBB);
4227 BuildMI(BB, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
4228 .addReg(newval).addReg(ptrA).addReg(ptrB);
4229 BuildMI(BB, TII->get(PPC::BCC))
4230 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loop1MBB);
4231 BuildMI(BB, TII->get(PPC::B)).addMBB(exitMBB);
4232 BB->addSuccessor(loop1MBB);
4233 BB->addSuccessor(exitMBB);
4236 BuildMI(BB, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
4237 .addReg(dest).addReg(ptrA).addReg(ptrB);
4238 BB->addSuccessor(exitMBB);
4243 } else if (MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I8 ||
4244 MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I16) {
4245 // We must use 64-bit registers for addresses when targeting 64-bit,
4246 // since we're actually doing arithmetic on them. Other registers
4248 bool is64bit = PPCSubTarget.isPPC64();
4249 bool is8bit = MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I8;
4251 unsigned dest = MI->getOperand(0).getReg();
4252 unsigned ptrA = MI->getOperand(1).getReg();
4253 unsigned ptrB = MI->getOperand(2).getReg();
4254 unsigned oldval = MI->getOperand(3).getReg();
4255 unsigned newval = MI->getOperand(4).getReg();
4257 MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB);
4258 MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB);
4259 MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
4260 MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
4261 F->insert(It, loop1MBB);
4262 F->insert(It, loop2MBB);
4263 F->insert(It, midMBB);
4264 F->insert(It, exitMBB);
4265 exitMBB->transferSuccessors(BB);
4267 MachineRegisterInfo &RegInfo = F->getRegInfo();
4268 const TargetRegisterClass *RC =
4269 is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
4270 (const TargetRegisterClass *) &PPC::GPRCRegClass;
4271 unsigned PtrReg = RegInfo.createVirtualRegister(RC);
4272 unsigned Shift1Reg = RegInfo.createVirtualRegister(RC);
4273 unsigned ShiftReg = RegInfo.createVirtualRegister(RC);
4274 unsigned NewVal2Reg = RegInfo.createVirtualRegister(RC);
4275 unsigned NewVal3Reg = RegInfo.createVirtualRegister(RC);
4276 unsigned OldVal2Reg = RegInfo.createVirtualRegister(RC);
4277 unsigned OldVal3Reg = RegInfo.createVirtualRegister(RC);
4278 unsigned MaskReg = RegInfo.createVirtualRegister(RC);
4279 unsigned Mask2Reg = RegInfo.createVirtualRegister(RC);
4280 unsigned Mask3Reg = RegInfo.createVirtualRegister(RC);
4281 unsigned Tmp2Reg = RegInfo.createVirtualRegister(RC);
4282 unsigned Tmp4Reg = RegInfo.createVirtualRegister(RC);
4283 unsigned TmpDestReg = RegInfo.createVirtualRegister(RC);
4285 unsigned TmpReg = RegInfo.createVirtualRegister(RC);
4288 // fallthrough --> loopMBB
4289 BB->addSuccessor(loop1MBB);
4291 // The 4-byte load must be aligned, while a char or short may be
4292 // anywhere in the word. Hence all this nasty bookkeeping code.
4293 // add ptr1, ptrA, ptrB [copy if ptrA==0]
4294 // rlwinm shift1, ptr1, 3, 27, 28 [3, 27, 27]
4295 // xori shift, shift1, 24 [16]
4296 // rlwinm ptr, ptr1, 0, 0, 29
4297 // slw newval2, newval, shift
4298 // slw oldval2, oldval,shift
4299 // li mask2, 255 [li mask3, 0; ori mask2, mask3, 65535]
4300 // slw mask, mask2, shift
4301 // and newval3, newval2, mask
4302 // and oldval3, oldval2, mask
4304 // lwarx tmpDest, ptr
4305 // and tmp, tmpDest, mask
4306 // cmpw tmp, oldval3
4309 // andc tmp2, tmpDest, mask
4310 // or tmp4, tmp2, newval3
4315 // stwcx. tmpDest, ptr
4317 // srw dest, tmpDest, shift
4318 if (ptrA!=PPC::R0) {
4319 Ptr1Reg = RegInfo.createVirtualRegister(RC);
4320 BuildMI(BB, TII->get(is64bit ? PPC::ADD8 : PPC::ADD4), Ptr1Reg)
4321 .addReg(ptrA).addReg(ptrB);
4325 BuildMI(BB, TII->get(PPC::RLWINM), Shift1Reg).addReg(Ptr1Reg)
4326 .addImm(3).addImm(27).addImm(is8bit ? 28 : 27);
4327 BuildMI(BB, TII->get(is64bit ? PPC::XORI8 : PPC::XORI), ShiftReg)
4328 .addReg(Shift1Reg).addImm(is8bit ? 24 : 16);
4330 BuildMI(BB, TII->get(PPC::RLDICR), PtrReg)
4331 .addReg(Ptr1Reg).addImm(0).addImm(61);
4333 BuildMI(BB, TII->get(PPC::RLWINM), PtrReg)
4334 .addReg(Ptr1Reg).addImm(0).addImm(0).addImm(29);
4335 BuildMI(BB, TII->get(PPC::SLW), NewVal2Reg)
4336 .addReg(newval).addReg(ShiftReg);
4337 BuildMI(BB, TII->get(PPC::SLW), OldVal2Reg)
4338 .addReg(oldval).addReg(ShiftReg);
4340 BuildMI(BB, TII->get(PPC::LI), Mask2Reg).addImm(255);
4342 BuildMI(BB, TII->get(PPC::LI), Mask3Reg).addImm(0);
4343 BuildMI(BB, TII->get(PPC::ORI), Mask2Reg).addReg(Mask3Reg).addImm(65535);
4345 BuildMI(BB, TII->get(PPC::SLW), MaskReg)
4346 .addReg(Mask2Reg).addReg(ShiftReg);
4347 BuildMI(BB, TII->get(PPC::AND), NewVal3Reg)
4348 .addReg(NewVal2Reg).addReg(MaskReg);
4349 BuildMI(BB, TII->get(PPC::AND), OldVal3Reg)
4350 .addReg(OldVal2Reg).addReg(MaskReg);
4353 BuildMI(BB, TII->get(PPC::LWARX), TmpDestReg)
4354 .addReg(PPC::R0).addReg(PtrReg);
4355 BuildMI(BB, TII->get(PPC::AND),TmpReg).addReg(TmpDestReg).addReg(MaskReg);
4356 BuildMI(BB, TII->get(PPC::CMPW), PPC::CR0)
4357 .addReg(TmpReg).addReg(OldVal3Reg);
4358 BuildMI(BB, TII->get(PPC::BCC))
4359 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(midMBB);
4360 BB->addSuccessor(loop2MBB);
4361 BB->addSuccessor(midMBB);
4364 BuildMI(BB, TII->get(PPC::ANDC),Tmp2Reg).addReg(TmpDestReg).addReg(MaskReg);
4365 BuildMI(BB, TII->get(PPC::OR),Tmp4Reg).addReg(Tmp2Reg).addReg(NewVal3Reg);
4366 BuildMI(BB, TII->get(PPC::STWCX)).addReg(Tmp4Reg)
4367 .addReg(PPC::R0).addReg(PtrReg);
4368 BuildMI(BB, TII->get(PPC::BCC))
4369 .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loop1MBB);
4370 BuildMI(BB, TII->get(PPC::B)).addMBB(exitMBB);
4371 BB->addSuccessor(loop1MBB);
4372 BB->addSuccessor(exitMBB);
4375 BuildMI(BB, TII->get(PPC::STWCX)).addReg(TmpDestReg)
4376 .addReg(PPC::R0).addReg(PtrReg);
4377 BB->addSuccessor(exitMBB);
4382 BuildMI(BB, TII->get(PPC::SRW),dest).addReg(TmpReg).addReg(ShiftReg);
4384 assert(0 && "Unexpected instr type to insert");
4387 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
4391 //===----------------------------------------------------------------------===//
4392 // Target Optimization Hooks
4393 //===----------------------------------------------------------------------===//
4395 SDValue PPCTargetLowering::PerformDAGCombine(SDNode *N,
4396 DAGCombinerInfo &DCI) const {
4397 TargetMachine &TM = getTargetMachine();
4398 SelectionDAG &DAG = DCI.DAG;
4399 switch (N->getOpcode()) {
4402 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
4403 if (C->getValue() == 0) // 0 << V -> 0.
4404 return N->getOperand(0);
4408 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
4409 if (C->getValue() == 0) // 0 >>u V -> 0.
4410 return N->getOperand(0);
4414 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
4415 if (C->getValue() == 0 || // 0 >>s V -> 0.
4416 C->isAllOnesValue()) // -1 >>s V -> -1.
4417 return N->getOperand(0);
4421 case ISD::SINT_TO_FP:
4422 if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
4423 if (N->getOperand(0).getOpcode() == ISD::FP_TO_SINT) {
4424 // Turn (sint_to_fp (fp_to_sint X)) -> fctidz/fcfid without load/stores.
4425 // We allow the src/dst to be either f32/f64, but the intermediate
4426 // type must be i64.
4427 if (N->getOperand(0).getValueType() == MVT::i64 &&
4428 N->getOperand(0).getOperand(0).getValueType() != MVT::ppcf128) {
4429 SDValue Val = N->getOperand(0).getOperand(0);
4430 if (Val.getValueType() == MVT::f32) {
4431 Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
4432 DCI.AddToWorklist(Val.getNode());
4435 Val = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Val);
4436 DCI.AddToWorklist(Val.getNode());
4437 Val = DAG.getNode(PPCISD::FCFID, MVT::f64, Val);
4438 DCI.AddToWorklist(Val.getNode());
4439 if (N->getValueType(0) == MVT::f32) {
4440 Val = DAG.getNode(ISD::FP_ROUND, MVT::f32, Val,
4441 DAG.getIntPtrConstant(0));
4442 DCI.AddToWorklist(Val.getNode());
4445 } else if (N->getOperand(0).getValueType() == MVT::i32) {
4446 // If the intermediate type is i32, we can avoid the load/store here
4453 // Turn STORE (FP_TO_SINT F) -> STFIWX(FCTIWZ(F)).
4454 if (TM.getSubtarget<PPCSubtarget>().hasSTFIWX() &&
4455 !cast<StoreSDNode>(N)->isTruncatingStore() &&
4456 N->getOperand(1).getOpcode() == ISD::FP_TO_SINT &&
4457 N->getOperand(1).getValueType() == MVT::i32 &&
4458 N->getOperand(1).getOperand(0).getValueType() != MVT::ppcf128) {
4459 SDValue Val = N->getOperand(1).getOperand(0);
4460 if (Val.getValueType() == MVT::f32) {
4461 Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
4462 DCI.AddToWorklist(Val.getNode());
4464 Val = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Val);
4465 DCI.AddToWorklist(Val.getNode());
4467 Val = DAG.getNode(PPCISD::STFIWX, MVT::Other, N->getOperand(0), Val,
4468 N->getOperand(2), N->getOperand(3));
4469 DCI.AddToWorklist(Val.getNode());
4473 // Turn STORE (BSWAP) -> sthbrx/stwbrx.
4474 if (N->getOperand(1).getOpcode() == ISD::BSWAP &&
4475 N->getOperand(1).getNode()->hasOneUse() &&
4476 (N->getOperand(1).getValueType() == MVT::i32 ||
4477 N->getOperand(1).getValueType() == MVT::i16)) {
4478 SDValue BSwapOp = N->getOperand(1).getOperand(0);
4479 // Do an any-extend to 32-bits if this is a half-word input.
4480 if (BSwapOp.getValueType() == MVT::i16)
4481 BSwapOp = DAG.getNode(ISD::ANY_EXTEND, MVT::i32, BSwapOp);
4483 return DAG.getNode(PPCISD::STBRX, MVT::Other, N->getOperand(0), BSwapOp,
4484 N->getOperand(2), N->getOperand(3),
4485 DAG.getValueType(N->getOperand(1).getValueType()));
4489 // Turn BSWAP (LOAD) -> lhbrx/lwbrx.
4490 if (ISD::isNON_EXTLoad(N->getOperand(0).getNode()) &&
4491 N->getOperand(0).hasOneUse() &&
4492 (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i16)) {
4493 SDValue Load = N->getOperand(0);
4494 LoadSDNode *LD = cast<LoadSDNode>(Load);
4495 // Create the byte-swapping load.
4496 std::vector<MVT> VTs;
4497 VTs.push_back(MVT::i32);
4498 VTs.push_back(MVT::Other);
4499 SDValue MO = DAG.getMemOperand(LD->getMemOperand());
4501 LD->getChain(), // Chain
4502 LD->getBasePtr(), // Ptr
4504 DAG.getValueType(N->getValueType(0)) // VT
4506 SDValue BSLoad = DAG.getNode(PPCISD::LBRX, VTs, Ops, 4);
4508 // If this is an i16 load, insert the truncate.
4509 SDValue ResVal = BSLoad;
4510 if (N->getValueType(0) == MVT::i16)
4511 ResVal = DAG.getNode(ISD::TRUNCATE, MVT::i16, BSLoad);
4513 // First, combine the bswap away. This makes the value produced by the
4515 DCI.CombineTo(N, ResVal);
4517 // Next, combine the load away, we give it a bogus result value but a real
4518 // chain result. The result value is dead because the bswap is dead.
4519 DCI.CombineTo(Load.getNode(), ResVal, BSLoad.getValue(1));
4521 // Return N so it doesn't get rechecked!
4522 return SDValue(N, 0);
4526 case PPCISD::VCMP: {
4527 // If a VCMPo node already exists with exactly the same operands as this
4528 // node, use its result instead of this node (VCMPo computes both a CR6 and
4529 // a normal output).
4531 if (!N->getOperand(0).hasOneUse() &&
4532 !N->getOperand(1).hasOneUse() &&
4533 !N->getOperand(2).hasOneUse()) {
4535 // Scan all of the users of the LHS, looking for VCMPo's that match.
4536 SDNode *VCMPoNode = 0;
4538 SDNode *LHSN = N->getOperand(0).getNode();
4539 for (SDNode::use_iterator UI = LHSN->use_begin(), E = LHSN->use_end();
4541 if (UI->getOpcode() == PPCISD::VCMPo &&
4542 UI->getOperand(1) == N->getOperand(1) &&
4543 UI->getOperand(2) == N->getOperand(2) &&
4544 UI->getOperand(0) == N->getOperand(0)) {
4549 // If there is no VCMPo node, or if the flag value has a single use, don't
4551 if (!VCMPoNode || VCMPoNode->hasNUsesOfValue(0, 1))
4554 // Look at the (necessarily single) use of the flag value. If it has a
4555 // chain, this transformation is more complex. Note that multiple things
4556 // could use the value result, which we should ignore.
4557 SDNode *FlagUser = 0;
4558 for (SDNode::use_iterator UI = VCMPoNode->use_begin();
4559 FlagUser == 0; ++UI) {
4560 assert(UI != VCMPoNode->use_end() && "Didn't find user!");
4562 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
4563 if (User->getOperand(i) == SDValue(VCMPoNode, 1)) {
4570 // If the user is a MFCR instruction, we know this is safe. Otherwise we
4571 // give up for right now.
4572 if (FlagUser->getOpcode() == PPCISD::MFCR)
4573 return SDValue(VCMPoNode, 0);
4578 // If this is a branch on an altivec predicate comparison, lower this so
4579 // that we don't have to do a MFCR: instead, branch directly on CR6. This
4580 // lowering is done pre-legalize, because the legalizer lowers the predicate
4581 // compare down to code that is difficult to reassemble.
4582 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
4583 SDValue LHS = N->getOperand(2), RHS = N->getOperand(3);
4587 if (LHS.getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
4588 isa<ConstantSDNode>(RHS) && (CC == ISD::SETEQ || CC == ISD::SETNE) &&
4589 getAltivecCompareInfo(LHS, CompareOpc, isDot)) {
4590 assert(isDot && "Can't compare against a vector result!");
4592 // If this is a comparison against something other than 0/1, then we know
4593 // that the condition is never/always true.
4594 unsigned Val = cast<ConstantSDNode>(RHS)->getValue();
4595 if (Val != 0 && Val != 1) {
4596 if (CC == ISD::SETEQ) // Cond never true, remove branch.
4597 return N->getOperand(0);
4598 // Always !=, turn it into an unconditional branch.
4599 return DAG.getNode(ISD::BR, MVT::Other,
4600 N->getOperand(0), N->getOperand(4));
4603 bool BranchOnWhenPredTrue = (CC == ISD::SETEQ) ^ (Val == 0);
4605 // Create the PPCISD altivec 'dot' comparison node.
4606 std::vector<MVT> VTs;
4608 LHS.getOperand(2), // LHS of compare
4609 LHS.getOperand(3), // RHS of compare
4610 DAG.getConstant(CompareOpc, MVT::i32)
4612 VTs.push_back(LHS.getOperand(2).getValueType());
4613 VTs.push_back(MVT::Flag);
4614 SDValue CompNode = DAG.getNode(PPCISD::VCMPo, VTs, Ops, 3);
4616 // Unpack the result based on how the target uses it.
4617 PPC::Predicate CompOpc;
4618 switch (cast<ConstantSDNode>(LHS.getOperand(1))->getValue()) {
4619 default: // Can't happen, don't crash on invalid number though.
4620 case 0: // Branch on the value of the EQ bit of CR6.
4621 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_EQ : PPC::PRED_NE;
4623 case 1: // Branch on the inverted value of the EQ bit of CR6.
4624 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_NE : PPC::PRED_EQ;
4626 case 2: // Branch on the value of the LT bit of CR6.
4627 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_LT : PPC::PRED_GE;
4629 case 3: // Branch on the inverted value of the LT bit of CR6.
4630 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_GE : PPC::PRED_LT;
4634 return DAG.getNode(PPCISD::COND_BRANCH, MVT::Other, N->getOperand(0),
4635 DAG.getConstant(CompOpc, MVT::i32),
4636 DAG.getRegister(PPC::CR6, MVT::i32),
4637 N->getOperand(4), CompNode.getValue(1));
4646 //===----------------------------------------------------------------------===//
4647 // Inline Assembly Support
4648 //===----------------------------------------------------------------------===//
4650 void PPCTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
4654 const SelectionDAG &DAG,
4655 unsigned Depth) const {
4656 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
4657 switch (Op.getOpcode()) {
4659 case PPCISD::LBRX: {
4660 // lhbrx is known to have the top bits cleared out.
4661 if (cast<VTSDNode>(Op.getOperand(3))->getVT() == MVT::i16)
4662 KnownZero = 0xFFFF0000;
4665 case ISD::INTRINSIC_WO_CHAIN: {
4666 switch (cast<ConstantSDNode>(Op.getOperand(0))->getValue()) {
4668 case Intrinsic::ppc_altivec_vcmpbfp_p:
4669 case Intrinsic::ppc_altivec_vcmpeqfp_p:
4670 case Intrinsic::ppc_altivec_vcmpequb_p:
4671 case Intrinsic::ppc_altivec_vcmpequh_p:
4672 case Intrinsic::ppc_altivec_vcmpequw_p:
4673 case Intrinsic::ppc_altivec_vcmpgefp_p:
4674 case Intrinsic::ppc_altivec_vcmpgtfp_p:
4675 case Intrinsic::ppc_altivec_vcmpgtsb_p:
4676 case Intrinsic::ppc_altivec_vcmpgtsh_p:
4677 case Intrinsic::ppc_altivec_vcmpgtsw_p:
4678 case Intrinsic::ppc_altivec_vcmpgtub_p:
4679 case Intrinsic::ppc_altivec_vcmpgtuh_p:
4680 case Intrinsic::ppc_altivec_vcmpgtuw_p:
4681 KnownZero = ~1U; // All bits but the low one are known to be zero.
4689 /// getConstraintType - Given a constraint, return the type of
4690 /// constraint it is for this target.
4691 PPCTargetLowering::ConstraintType
4692 PPCTargetLowering::getConstraintType(const std::string &Constraint) const {
4693 if (Constraint.size() == 1) {
4694 switch (Constraint[0]) {
4701 return C_RegisterClass;
4704 return TargetLowering::getConstraintType(Constraint);
4707 std::pair<unsigned, const TargetRegisterClass*>
4708 PPCTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
4710 if (Constraint.size() == 1) {
4711 // GCC RS6000 Constraint Letters
4712 switch (Constraint[0]) {
4715 if (VT == MVT::i64 && PPCSubTarget.isPPC64())
4716 return std::make_pair(0U, PPC::G8RCRegisterClass);
4717 return std::make_pair(0U, PPC::GPRCRegisterClass);
4720 return std::make_pair(0U, PPC::F4RCRegisterClass);
4721 else if (VT == MVT::f64)
4722 return std::make_pair(0U, PPC::F8RCRegisterClass);
4725 return std::make_pair(0U, PPC::VRRCRegisterClass);
4727 return std::make_pair(0U, PPC::CRRCRegisterClass);
4731 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
4735 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
4736 /// vector. If it is invalid, don't add anything to Ops.
4737 void PPCTargetLowering::LowerAsmOperandForConstraint(SDValue Op, char Letter,
4738 std::vector<SDValue>&Ops,
4739 SelectionDAG &DAG) const {
4740 SDValue Result(0,0);
4751 ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op);
4752 if (!CST) return; // Must be an immediate to match.
4753 unsigned Value = CST->getValue();
4755 default: assert(0 && "Unknown constraint letter!");
4756 case 'I': // "I" is a signed 16-bit constant.
4757 if ((short)Value == (int)Value)
4758 Result = DAG.getTargetConstant(Value, Op.getValueType());
4760 case 'J': // "J" is a constant with only the high-order 16 bits nonzero.
4761 case 'L': // "L" is a signed 16-bit constant shifted left 16 bits.
4762 if ((short)Value == 0)
4763 Result = DAG.getTargetConstant(Value, Op.getValueType());
4765 case 'K': // "K" is a constant with only the low-order 16 bits nonzero.
4766 if ((Value >> 16) == 0)
4767 Result = DAG.getTargetConstant(Value, Op.getValueType());
4769 case 'M': // "M" is a constant that is greater than 31.
4771 Result = DAG.getTargetConstant(Value, Op.getValueType());
4773 case 'N': // "N" is a positive constant that is an exact power of two.
4774 if ((int)Value > 0 && isPowerOf2_32(Value))
4775 Result = DAG.getTargetConstant(Value, Op.getValueType());
4777 case 'O': // "O" is the constant zero.
4779 Result = DAG.getTargetConstant(Value, Op.getValueType());
4781 case 'P': // "P" is a constant whose negation is a signed 16-bit constant.
4782 if ((short)-Value == (int)-Value)
4783 Result = DAG.getTargetConstant(Value, Op.getValueType());
4790 if (Result.getNode()) {
4791 Ops.push_back(Result);
4795 // Handle standard constraint letters.
4796 TargetLowering::LowerAsmOperandForConstraint(Op, Letter, Ops, DAG);
4799 // isLegalAddressingMode - Return true if the addressing mode represented
4800 // by AM is legal for this target, for a load/store of the specified type.
4801 bool PPCTargetLowering::isLegalAddressingMode(const AddrMode &AM,
4802 const Type *Ty) const {
4803 // FIXME: PPC does not allow r+i addressing modes for vectors!
4805 // PPC allows a sign-extended 16-bit immediate field.
4806 if (AM.BaseOffs <= -(1LL << 16) || AM.BaseOffs >= (1LL << 16)-1)
4809 // No global is ever allowed as a base.
4813 // PPC only support r+r,
4815 case 0: // "r+i" or just "i", depending on HasBaseReg.
4818 if (AM.HasBaseReg && AM.BaseOffs) // "r+r+i" is not allowed.
4820 // Otherwise we have r+r or r+i.
4823 if (AM.HasBaseReg || AM.BaseOffs) // 2*r+r or 2*r+i is not allowed.
4825 // Allow 2*r as r+r.
4828 // No other scales are supported.
4835 /// isLegalAddressImmediate - Return true if the integer value can be used
4836 /// as the offset of the target addressing mode for load / store of the
4838 bool PPCTargetLowering::isLegalAddressImmediate(int64_t V,const Type *Ty) const{
4839 // PPC allows a sign-extended 16-bit immediate field.
4840 return (V > -(1 << 16) && V < (1 << 16)-1);
4843 bool PPCTargetLowering::isLegalAddressImmediate(llvm::GlobalValue* GV) const {
4847 SDValue PPCTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) {
4848 // Depths > 0 not supported yet!
4849 if (cast<ConstantSDNode>(Op.getOperand(0))->getValue() > 0)
4852 MachineFunction &MF = DAG.getMachineFunction();
4853 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
4855 // Just load the return address off the stack.
4856 SDValue RetAddrFI = getReturnAddrFrameIndex(DAG);
4858 // Make sure the function really does not optimize away the store of the RA
4860 FuncInfo->setLRStoreRequired();
4861 return DAG.getLoad(getPointerTy(), DAG.getEntryNode(), RetAddrFI, NULL, 0);
4864 SDValue PPCTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) {
4865 // Depths > 0 not supported yet!
4866 if (cast<ConstantSDNode>(Op.getOperand(0))->getValue() > 0)
4869 MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
4870 bool isPPC64 = PtrVT == MVT::i64;
4872 MachineFunction &MF = DAG.getMachineFunction();
4873 MachineFrameInfo *MFI = MF.getFrameInfo();
4874 bool is31 = (NoFramePointerElim || MFI->hasVarSizedObjects())
4875 && MFI->getStackSize();
4878 return DAG.getCopyFromReg(DAG.getEntryNode(), is31 ? PPC::X31 : PPC::X1,
4881 return DAG.getCopyFromReg(DAG.getEntryNode(), is31 ? PPC::R31 : PPC::R1,