1 //===-- PPCISelLowering.cpp - PPC DAG Lowering Implementation -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source 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/Analysis/ScalarEvolutionExpressions.h"
22 #include "llvm/CodeGen/CallingConvLower.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineInstrBuilder.h"
26 #include "llvm/CodeGen/SelectionDAG.h"
27 #include "llvm/CodeGen/SSARegMap.h"
28 #include "llvm/Constants.h"
29 #include "llvm/Function.h"
30 #include "llvm/Intrinsics.h"
31 #include "llvm/Support/MathExtras.h"
32 #include "llvm/Target/TargetOptions.h"
33 #include "llvm/Support/CommandLine.h"
36 static cl::opt<bool> EnablePPCPreinc("enable-ppc-preinc",
37 cl::desc("enable preincrement load/store generation on PPC (experimental)"),
40 PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
41 : TargetLowering(TM), PPCSubTarget(*TM.getSubtargetImpl()) {
45 // Use _setjmp/_longjmp instead of setjmp/longjmp.
46 setUseUnderscoreSetJmp(true);
47 setUseUnderscoreLongJmp(true);
49 // Set up the register classes.
50 addRegisterClass(MVT::i32, PPC::GPRCRegisterClass);
51 addRegisterClass(MVT::f32, PPC::F4RCRegisterClass);
52 addRegisterClass(MVT::f64, PPC::F8RCRegisterClass);
54 // PowerPC has an i16 but no i8 (or i1) SEXTLOAD
55 setLoadXAction(ISD::SEXTLOAD, MVT::i1, Expand);
56 setLoadXAction(ISD::SEXTLOAD, MVT::i8, Expand);
58 // PowerPC does not have truncstore for i1.
59 setStoreXAction(MVT::i1, Promote);
61 // PowerPC has pre-inc load and store's.
62 setIndexedLoadAction(ISD::PRE_INC, MVT::i1, Legal);
63 setIndexedLoadAction(ISD::PRE_INC, MVT::i8, Legal);
64 setIndexedLoadAction(ISD::PRE_INC, MVT::i16, Legal);
65 setIndexedLoadAction(ISD::PRE_INC, MVT::i32, Legal);
66 setIndexedLoadAction(ISD::PRE_INC, MVT::i64, Legal);
67 setIndexedStoreAction(ISD::PRE_INC, MVT::i1, Legal);
68 setIndexedStoreAction(ISD::PRE_INC, MVT::i8, Legal);
69 setIndexedStoreAction(ISD::PRE_INC, MVT::i16, Legal);
70 setIndexedStoreAction(ISD::PRE_INC, MVT::i32, Legal);
71 setIndexedStoreAction(ISD::PRE_INC, MVT::i64, Legal);
73 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
74 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
76 // Shortening conversions involving ppcf128 get expanded (2 regs -> 1 reg)
77 setConvertAction(MVT::ppcf128, MVT::f64, Expand);
78 setConvertAction(MVT::ppcf128, MVT::f32, Expand);
79 // This is used in the ppcf128->int sequence. Note it has different semantics
80 // from FP_ROUND: that rounds to nearest, this rounds to zero.
81 setOperationAction(ISD::FP_ROUND_INREG, MVT::ppcf128, Custom);
83 // PowerPC has no intrinsics for these particular operations
84 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
85 setOperationAction(ISD::MEMSET, MVT::Other, Expand);
86 setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
88 // PowerPC has no SREM/UREM instructions
89 setOperationAction(ISD::SREM, MVT::i32, Expand);
90 setOperationAction(ISD::UREM, MVT::i32, Expand);
91 setOperationAction(ISD::SREM, MVT::i64, Expand);
92 setOperationAction(ISD::UREM, MVT::i64, Expand);
94 // Don't use SMUL_LOHI/UMUL_LOHI or SDIVREM/UDIVREM to lower SREM/UREM.
95 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
96 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
97 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
98 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
99 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
100 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
101 setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
102 setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
104 // We don't support sin/cos/sqrt/fmod/pow
105 setOperationAction(ISD::FSIN , MVT::f64, Expand);
106 setOperationAction(ISD::FCOS , MVT::f64, Expand);
107 setOperationAction(ISD::FREM , MVT::f64, Expand);
108 setOperationAction(ISD::FPOW , MVT::f64, Expand);
109 setOperationAction(ISD::FSIN , MVT::f32, Expand);
110 setOperationAction(ISD::FCOS , MVT::f32, Expand);
111 setOperationAction(ISD::FREM , MVT::f32, Expand);
112 setOperationAction(ISD::FPOW , MVT::f32, Expand);
114 // If we're enabling GP optimizations, use hardware square root
115 if (!TM.getSubtarget<PPCSubtarget>().hasFSQRT()) {
116 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
117 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
120 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
121 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
123 // PowerPC does not have BSWAP, CTPOP or CTTZ
124 setOperationAction(ISD::BSWAP, MVT::i32 , Expand);
125 setOperationAction(ISD::CTPOP, MVT::i32 , Expand);
126 setOperationAction(ISD::CTTZ , MVT::i32 , Expand);
127 setOperationAction(ISD::BSWAP, MVT::i64 , Expand);
128 setOperationAction(ISD::CTPOP, MVT::i64 , Expand);
129 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
131 // PowerPC does not have ROTR
132 setOperationAction(ISD::ROTR, MVT::i32 , Expand);
134 // PowerPC does not have Select
135 setOperationAction(ISD::SELECT, MVT::i32, Expand);
136 setOperationAction(ISD::SELECT, MVT::i64, Expand);
137 setOperationAction(ISD::SELECT, MVT::f32, Expand);
138 setOperationAction(ISD::SELECT, MVT::f64, Expand);
140 // PowerPC wants to turn select_cc of FP into fsel when possible.
141 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
142 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
144 // PowerPC wants to optimize integer setcc a bit
145 setOperationAction(ISD::SETCC, MVT::i32, Custom);
147 // PowerPC does not have BRCOND which requires SetCC
148 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
150 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
152 // PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
153 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
155 // PowerPC does not have [U|S]INT_TO_FP
156 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
157 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
159 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
160 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
161 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Expand);
162 setOperationAction(ISD::BIT_CONVERT, MVT::f64, Expand);
164 // We cannot sextinreg(i1). Expand to shifts.
165 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
167 // Support label based line numbers.
168 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
169 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
170 if (!TM.getSubtarget<PPCSubtarget>().isDarwin()) {
171 setOperationAction(ISD::LABEL, MVT::Other, Expand);
173 setOperationAction(ISD::EXCEPTIONADDR, MVT::i64, Expand);
174 setOperationAction(ISD::EHSELECTION, MVT::i64, Expand);
175 setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
176 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
179 // We want to legalize GlobalAddress and ConstantPool nodes into the
180 // appropriate instructions to materialize the address.
181 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
182 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
183 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
184 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
185 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
186 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
187 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
188 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
190 // RET must be custom lowered, to meet ABI requirements
191 setOperationAction(ISD::RET , MVT::Other, Custom);
193 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
194 setOperationAction(ISD::VASTART , MVT::Other, Custom);
196 // VAARG is custom lowered with ELF 32 ABI
197 if (TM.getSubtarget<PPCSubtarget>().isELF32_ABI())
198 setOperationAction(ISD::VAARG, MVT::Other, Custom);
200 setOperationAction(ISD::VAARG, MVT::Other, Expand);
202 // Use the default implementation.
203 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
204 setOperationAction(ISD::VAEND , MVT::Other, Expand);
205 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
206 setOperationAction(ISD::STACKRESTORE , MVT::Other, Custom);
207 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
208 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64 , Custom);
210 // We want to custom lower some of our intrinsics.
211 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
213 if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
214 // They also have instructions for converting between i64 and fp.
215 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
216 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
217 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
218 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
219 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
221 // FIXME: disable this lowered code. This generates 64-bit register values,
222 // and we don't model the fact that the top part is clobbered by calls. We
223 // need to flag these together so that the value isn't live across a call.
224 //setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
226 // To take advantage of the above i64 FP_TO_SINT, promote i32 FP_TO_UINT
227 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Promote);
229 // PowerPC does not have FP_TO_UINT on 32-bit implementations.
230 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
233 if (TM.getSubtarget<PPCSubtarget>().use64BitRegs()) {
234 // 64 bit PowerPC implementations can support i64 types directly
235 addRegisterClass(MVT::i64, PPC::G8RCRegisterClass);
236 // BUILD_PAIR can't be handled natively, and should be expanded to shl/or
237 setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
239 // 32 bit PowerPC wants to expand i64 shifts itself.
240 setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
241 setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
242 setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
245 if (TM.getSubtarget<PPCSubtarget>().hasAltivec()) {
246 // First set operation action for all vector types to expand. Then we
247 // will selectively turn on ones that can be effectively codegen'd.
248 for (unsigned VT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
249 VT <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++VT) {
250 // add/sub are legal for all supported vector VT's.
251 setOperationAction(ISD::ADD , (MVT::ValueType)VT, Legal);
252 setOperationAction(ISD::SUB , (MVT::ValueType)VT, Legal);
254 // We promote all shuffles to v16i8.
255 setOperationAction(ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, Promote);
256 AddPromotedToType (ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, MVT::v16i8);
258 // We promote all non-typed operations to v4i32.
259 setOperationAction(ISD::AND , (MVT::ValueType)VT, Promote);
260 AddPromotedToType (ISD::AND , (MVT::ValueType)VT, MVT::v4i32);
261 setOperationAction(ISD::OR , (MVT::ValueType)VT, Promote);
262 AddPromotedToType (ISD::OR , (MVT::ValueType)VT, MVT::v4i32);
263 setOperationAction(ISD::XOR , (MVT::ValueType)VT, Promote);
264 AddPromotedToType (ISD::XOR , (MVT::ValueType)VT, MVT::v4i32);
265 setOperationAction(ISD::LOAD , (MVT::ValueType)VT, Promote);
266 AddPromotedToType (ISD::LOAD , (MVT::ValueType)VT, MVT::v4i32);
267 setOperationAction(ISD::SELECT, (MVT::ValueType)VT, Promote);
268 AddPromotedToType (ISD::SELECT, (MVT::ValueType)VT, MVT::v4i32);
269 setOperationAction(ISD::STORE, (MVT::ValueType)VT, Promote);
270 AddPromotedToType (ISD::STORE, (MVT::ValueType)VT, MVT::v4i32);
272 // No other operations are legal.
273 setOperationAction(ISD::MUL , (MVT::ValueType)VT, Expand);
274 setOperationAction(ISD::SDIV, (MVT::ValueType)VT, Expand);
275 setOperationAction(ISD::SREM, (MVT::ValueType)VT, Expand);
276 setOperationAction(ISD::UDIV, (MVT::ValueType)VT, Expand);
277 setOperationAction(ISD::UREM, (MVT::ValueType)VT, Expand);
278 setOperationAction(ISD::FDIV, (MVT::ValueType)VT, Expand);
279 setOperationAction(ISD::FNEG, (MVT::ValueType)VT, Expand);
280 setOperationAction(ISD::EXTRACT_VECTOR_ELT, (MVT::ValueType)VT, Expand);
281 setOperationAction(ISD::INSERT_VECTOR_ELT, (MVT::ValueType)VT, Expand);
282 setOperationAction(ISD::BUILD_VECTOR, (MVT::ValueType)VT, Expand);
283 setOperationAction(ISD::UMUL_LOHI, (MVT::ValueType)VT, Expand);
284 setOperationAction(ISD::SMUL_LOHI, (MVT::ValueType)VT, Expand);
285 setOperationAction(ISD::UDIVREM, (MVT::ValueType)VT, Expand);
286 setOperationAction(ISD::SDIVREM, (MVT::ValueType)VT, Expand);
287 setOperationAction(ISD::SCALAR_TO_VECTOR, (MVT::ValueType)VT, Expand);
288 setOperationAction(ISD::FPOW, (MVT::ValueType)VT, Expand);
289 setOperationAction(ISD::CTPOP, (MVT::ValueType)VT, Expand);
290 setOperationAction(ISD::CTLZ, (MVT::ValueType)VT, Expand);
291 setOperationAction(ISD::CTTZ, (MVT::ValueType)VT, Expand);
294 // We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
295 // with merges, splats, etc.
296 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
298 setOperationAction(ISD::AND , MVT::v4i32, Legal);
299 setOperationAction(ISD::OR , MVT::v4i32, Legal);
300 setOperationAction(ISD::XOR , MVT::v4i32, Legal);
301 setOperationAction(ISD::LOAD , MVT::v4i32, Legal);
302 setOperationAction(ISD::SELECT, MVT::v4i32, Expand);
303 setOperationAction(ISD::STORE , MVT::v4i32, Legal);
305 addRegisterClass(MVT::v4f32, PPC::VRRCRegisterClass);
306 addRegisterClass(MVT::v4i32, PPC::VRRCRegisterClass);
307 addRegisterClass(MVT::v8i16, PPC::VRRCRegisterClass);
308 addRegisterClass(MVT::v16i8, PPC::VRRCRegisterClass);
310 setOperationAction(ISD::MUL, MVT::v4f32, Legal);
311 setOperationAction(ISD::MUL, MVT::v4i32, Custom);
312 setOperationAction(ISD::MUL, MVT::v8i16, Custom);
313 setOperationAction(ISD::MUL, MVT::v16i8, Custom);
315 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Custom);
316 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Custom);
318 setOperationAction(ISD::BUILD_VECTOR, MVT::v16i8, Custom);
319 setOperationAction(ISD::BUILD_VECTOR, MVT::v8i16, Custom);
320 setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32, Custom);
321 setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
324 setSetCCResultType(MVT::i32);
325 setShiftAmountType(MVT::i32);
326 setSetCCResultContents(ZeroOrOneSetCCResult);
328 if (TM.getSubtarget<PPCSubtarget>().isPPC64()) {
329 setStackPointerRegisterToSaveRestore(PPC::X1);
330 setExceptionPointerRegister(PPC::X3);
331 setExceptionSelectorRegister(PPC::X4);
333 setStackPointerRegisterToSaveRestore(PPC::R1);
334 setExceptionPointerRegister(PPC::R3);
335 setExceptionSelectorRegister(PPC::R4);
338 // We have target-specific dag combine patterns for the following nodes:
339 setTargetDAGCombine(ISD::SINT_TO_FP);
340 setTargetDAGCombine(ISD::STORE);
341 setTargetDAGCombine(ISD::BR_CC);
342 setTargetDAGCombine(ISD::BSWAP);
344 computeRegisterProperties();
347 const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
350 case PPCISD::FSEL: return "PPCISD::FSEL";
351 case PPCISD::FCFID: return "PPCISD::FCFID";
352 case PPCISD::FCTIDZ: return "PPCISD::FCTIDZ";
353 case PPCISD::FCTIWZ: return "PPCISD::FCTIWZ";
354 case PPCISD::STFIWX: return "PPCISD::STFIWX";
355 case PPCISD::VMADDFP: return "PPCISD::VMADDFP";
356 case PPCISD::VNMSUBFP: return "PPCISD::VNMSUBFP";
357 case PPCISD::VPERM: return "PPCISD::VPERM";
358 case PPCISD::Hi: return "PPCISD::Hi";
359 case PPCISD::Lo: return "PPCISD::Lo";
360 case PPCISD::DYNALLOC: return "PPCISD::DYNALLOC";
361 case PPCISD::GlobalBaseReg: return "PPCISD::GlobalBaseReg";
362 case PPCISD::SRL: return "PPCISD::SRL";
363 case PPCISD::SRA: return "PPCISD::SRA";
364 case PPCISD::SHL: return "PPCISD::SHL";
365 case PPCISD::EXTSW_32: return "PPCISD::EXTSW_32";
366 case PPCISD::STD_32: return "PPCISD::STD_32";
367 case PPCISD::CALL_ELF: return "PPCISD::CALL_ELF";
368 case PPCISD::CALL_Macho: return "PPCISD::CALL_Macho";
369 case PPCISD::MTCTR: return "PPCISD::MTCTR";
370 case PPCISD::BCTRL_Macho: return "PPCISD::BCTRL_Macho";
371 case PPCISD::BCTRL_ELF: return "PPCISD::BCTRL_ELF";
372 case PPCISD::RET_FLAG: return "PPCISD::RET_FLAG";
373 case PPCISD::MFCR: return "PPCISD::MFCR";
374 case PPCISD::VCMP: return "PPCISD::VCMP";
375 case PPCISD::VCMPo: return "PPCISD::VCMPo";
376 case PPCISD::LBRX: return "PPCISD::LBRX";
377 case PPCISD::STBRX: return "PPCISD::STBRX";
378 case PPCISD::COND_BRANCH: return "PPCISD::COND_BRANCH";
382 //===----------------------------------------------------------------------===//
383 // Node matching predicates, for use by the tblgen matching code.
384 //===----------------------------------------------------------------------===//
386 /// isFloatingPointZero - Return true if this is 0.0 or -0.0.
387 static bool isFloatingPointZero(SDOperand Op) {
388 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
389 return CFP->getValueAPF().isZero();
390 else if (ISD::isEXTLoad(Op.Val) || ISD::isNON_EXTLoad(Op.Val)) {
391 // Maybe this has already been legalized into the constant pool?
392 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
393 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
394 return CFP->getValueAPF().isZero();
399 /// isConstantOrUndef - Op is either an undef node or a ConstantSDNode. Return
400 /// true if Op is undef or if it matches the specified value.
401 static bool isConstantOrUndef(SDOperand Op, unsigned Val) {
402 return Op.getOpcode() == ISD::UNDEF ||
403 cast<ConstantSDNode>(Op)->getValue() == Val;
406 /// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
407 /// VPKUHUM instruction.
408 bool PPC::isVPKUHUMShuffleMask(SDNode *N, bool isUnary) {
410 for (unsigned i = 0; i != 16; ++i)
411 if (!isConstantOrUndef(N->getOperand(i), i*2+1))
414 for (unsigned i = 0; i != 8; ++i)
415 if (!isConstantOrUndef(N->getOperand(i), i*2+1) ||
416 !isConstantOrUndef(N->getOperand(i+8), i*2+1))
422 /// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
423 /// VPKUWUM instruction.
424 bool PPC::isVPKUWUMShuffleMask(SDNode *N, bool isUnary) {
426 for (unsigned i = 0; i != 16; i += 2)
427 if (!isConstantOrUndef(N->getOperand(i ), i*2+2) ||
428 !isConstantOrUndef(N->getOperand(i+1), i*2+3))
431 for (unsigned i = 0; i != 8; i += 2)
432 if (!isConstantOrUndef(N->getOperand(i ), i*2+2) ||
433 !isConstantOrUndef(N->getOperand(i+1), i*2+3) ||
434 !isConstantOrUndef(N->getOperand(i+8), i*2+2) ||
435 !isConstantOrUndef(N->getOperand(i+9), i*2+3))
441 /// isVMerge - Common function, used to match vmrg* shuffles.
443 static bool isVMerge(SDNode *N, unsigned UnitSize,
444 unsigned LHSStart, unsigned RHSStart) {
445 assert(N->getOpcode() == ISD::BUILD_VECTOR &&
446 N->getNumOperands() == 16 && "PPC only supports shuffles by bytes!");
447 assert((UnitSize == 1 || UnitSize == 2 || UnitSize == 4) &&
448 "Unsupported merge size!");
450 for (unsigned i = 0; i != 8/UnitSize; ++i) // Step over units
451 for (unsigned j = 0; j != UnitSize; ++j) { // Step over bytes within unit
452 if (!isConstantOrUndef(N->getOperand(i*UnitSize*2+j),
453 LHSStart+j+i*UnitSize) ||
454 !isConstantOrUndef(N->getOperand(i*UnitSize*2+UnitSize+j),
455 RHSStart+j+i*UnitSize))
461 /// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
462 /// a VRGL* instruction with the specified unit size (1,2 or 4 bytes).
463 bool PPC::isVMRGLShuffleMask(SDNode *N, unsigned UnitSize, bool isUnary) {
465 return isVMerge(N, UnitSize, 8, 24);
466 return isVMerge(N, UnitSize, 8, 8);
469 /// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
470 /// a VRGH* instruction with the specified unit size (1,2 or 4 bytes).
471 bool PPC::isVMRGHShuffleMask(SDNode *N, unsigned UnitSize, bool isUnary) {
473 return isVMerge(N, UnitSize, 0, 16);
474 return isVMerge(N, UnitSize, 0, 0);
478 /// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift
479 /// amount, otherwise return -1.
480 int PPC::isVSLDOIShuffleMask(SDNode *N, bool isUnary) {
481 assert(N->getOpcode() == ISD::BUILD_VECTOR &&
482 N->getNumOperands() == 16 && "PPC only supports shuffles by bytes!");
483 // Find the first non-undef value in the shuffle mask.
485 for (i = 0; i != 16 && N->getOperand(i).getOpcode() == ISD::UNDEF; ++i)
488 if (i == 16) return -1; // all undef.
490 // Otherwise, check to see if the rest of the elements are consequtively
491 // numbered from this value.
492 unsigned ShiftAmt = cast<ConstantSDNode>(N->getOperand(i))->getValue();
493 if (ShiftAmt < i) return -1;
497 // Check the rest of the elements to see if they are consequtive.
498 for (++i; i != 16; ++i)
499 if (!isConstantOrUndef(N->getOperand(i), ShiftAmt+i))
502 // Check the rest of the elements to see if they are consequtive.
503 for (++i; i != 16; ++i)
504 if (!isConstantOrUndef(N->getOperand(i), (ShiftAmt+i) & 15))
511 /// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
512 /// specifies a splat of a single element that is suitable for input to
513 /// VSPLTB/VSPLTH/VSPLTW.
514 bool PPC::isSplatShuffleMask(SDNode *N, unsigned EltSize) {
515 assert(N->getOpcode() == ISD::BUILD_VECTOR &&
516 N->getNumOperands() == 16 &&
517 (EltSize == 1 || EltSize == 2 || EltSize == 4));
519 // This is a splat operation if each element of the permute is the same, and
520 // if the value doesn't reference the second vector.
521 unsigned ElementBase = 0;
522 SDOperand Elt = N->getOperand(0);
523 if (ConstantSDNode *EltV = dyn_cast<ConstantSDNode>(Elt))
524 ElementBase = EltV->getValue();
526 return false; // FIXME: Handle UNDEF elements too!
528 if (cast<ConstantSDNode>(Elt)->getValue() >= 16)
531 // Check that they are consequtive.
532 for (unsigned i = 1; i != EltSize; ++i) {
533 if (!isa<ConstantSDNode>(N->getOperand(i)) ||
534 cast<ConstantSDNode>(N->getOperand(i))->getValue() != i+ElementBase)
538 assert(isa<ConstantSDNode>(Elt) && "Invalid VECTOR_SHUFFLE mask!");
539 for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
540 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
541 assert(isa<ConstantSDNode>(N->getOperand(i)) &&
542 "Invalid VECTOR_SHUFFLE mask!");
543 for (unsigned j = 0; j != EltSize; ++j)
544 if (N->getOperand(i+j) != N->getOperand(j))
551 /// isAllNegativeZeroVector - Returns true if all elements of build_vector
553 bool PPC::isAllNegativeZeroVector(SDNode *N) {
554 assert(N->getOpcode() == ISD::BUILD_VECTOR);
555 if (PPC::isSplatShuffleMask(N, N->getNumOperands()))
556 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N))
557 return CFP->getValueAPF().isNegZero();
561 /// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
562 /// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
563 unsigned PPC::getVSPLTImmediate(SDNode *N, unsigned EltSize) {
564 assert(isSplatShuffleMask(N, EltSize));
565 return cast<ConstantSDNode>(N->getOperand(0))->getValue() / EltSize;
568 /// get_VSPLTI_elt - If this is a build_vector of constants which can be formed
569 /// by using a vspltis[bhw] instruction of the specified element size, return
570 /// the constant being splatted. The ByteSize field indicates the number of
571 /// bytes of each element [124] -> [bhw].
572 SDOperand PPC::get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
573 SDOperand OpVal(0, 0);
575 // If ByteSize of the splat is bigger than the element size of the
576 // build_vector, then we have a case where we are checking for a splat where
577 // multiple elements of the buildvector are folded together into a single
578 // logical element of the splat (e.g. "vsplish 1" to splat {0,1}*8).
579 unsigned EltSize = 16/N->getNumOperands();
580 if (EltSize < ByteSize) {
581 unsigned Multiple = ByteSize/EltSize; // Number of BV entries per spltval.
582 SDOperand UniquedVals[4];
583 assert(Multiple > 1 && Multiple <= 4 && "How can this happen?");
585 // See if all of the elements in the buildvector agree across.
586 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
587 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
588 // If the element isn't a constant, bail fully out.
589 if (!isa<ConstantSDNode>(N->getOperand(i))) return SDOperand();
592 if (UniquedVals[i&(Multiple-1)].Val == 0)
593 UniquedVals[i&(Multiple-1)] = N->getOperand(i);
594 else if (UniquedVals[i&(Multiple-1)] != N->getOperand(i))
595 return SDOperand(); // no match.
598 // Okay, if we reached this point, UniquedVals[0..Multiple-1] contains
599 // either constant or undef values that are identical for each chunk. See
600 // if these chunks can form into a larger vspltis*.
602 // Check to see if all of the leading entries are either 0 or -1. If
603 // neither, then this won't fit into the immediate field.
604 bool LeadingZero = true;
605 bool LeadingOnes = true;
606 for (unsigned i = 0; i != Multiple-1; ++i) {
607 if (UniquedVals[i].Val == 0) continue; // Must have been undefs.
609 LeadingZero &= cast<ConstantSDNode>(UniquedVals[i])->isNullValue();
610 LeadingOnes &= cast<ConstantSDNode>(UniquedVals[i])->isAllOnesValue();
612 // Finally, check the least significant entry.
614 if (UniquedVals[Multiple-1].Val == 0)
615 return DAG.getTargetConstant(0, MVT::i32); // 0,0,0,undef
616 int Val = cast<ConstantSDNode>(UniquedVals[Multiple-1])->getValue();
618 return DAG.getTargetConstant(Val, MVT::i32); // 0,0,0,4 -> vspltisw(4)
621 if (UniquedVals[Multiple-1].Val == 0)
622 return DAG.getTargetConstant(~0U, MVT::i32); // -1,-1,-1,undef
623 int Val =cast<ConstantSDNode>(UniquedVals[Multiple-1])->getSignExtended();
624 if (Val >= -16) // -1,-1,-1,-2 -> vspltisw(-2)
625 return DAG.getTargetConstant(Val, MVT::i32);
631 // Check to see if this buildvec has a single non-undef value in its elements.
632 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
633 if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
635 OpVal = N->getOperand(i);
636 else if (OpVal != N->getOperand(i))
640 if (OpVal.Val == 0) return SDOperand(); // All UNDEF: use implicit def.
642 unsigned ValSizeInBytes = 0;
644 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
645 Value = CN->getValue();
646 ValSizeInBytes = MVT::getSizeInBits(CN->getValueType(0))/8;
647 } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
648 assert(CN->getValueType(0) == MVT::f32 && "Only one legal FP vector type!");
649 Value = FloatToBits(CN->getValueAPF().convertToFloat());
653 // If the splat value is larger than the element value, then we can never do
654 // this splat. The only case that we could fit the replicated bits into our
655 // immediate field for would be zero, and we prefer to use vxor for it.
656 if (ValSizeInBytes < ByteSize) return SDOperand();
658 // If the element value is larger than the splat value, cut it in half and
659 // check to see if the two halves are equal. Continue doing this until we
660 // get to ByteSize. This allows us to handle 0x01010101 as 0x01.
661 while (ValSizeInBytes > ByteSize) {
662 ValSizeInBytes >>= 1;
664 // If the top half equals the bottom half, we're still ok.
665 if (((Value >> (ValSizeInBytes*8)) & ((1 << (8*ValSizeInBytes))-1)) !=
666 (Value & ((1 << (8*ValSizeInBytes))-1)))
670 // Properly sign extend the value.
671 int ShAmt = (4-ByteSize)*8;
672 int MaskVal = ((int)Value << ShAmt) >> ShAmt;
674 // If this is zero, don't match, zero matches ISD::isBuildVectorAllZeros.
675 if (MaskVal == 0) return SDOperand();
677 // Finally, if this value fits in a 5 bit sext field, return it
678 if (((MaskVal << (32-5)) >> (32-5)) == MaskVal)
679 return DAG.getTargetConstant(MaskVal, MVT::i32);
683 //===----------------------------------------------------------------------===//
684 // Addressing Mode Selection
685 //===----------------------------------------------------------------------===//
687 /// isIntS16Immediate - This method tests to see if the node is either a 32-bit
688 /// or 64-bit immediate, and if the value can be accurately represented as a
689 /// sign extension from a 16-bit value. If so, this returns true and the
691 static bool isIntS16Immediate(SDNode *N, short &Imm) {
692 if (N->getOpcode() != ISD::Constant)
695 Imm = (short)cast<ConstantSDNode>(N)->getValue();
696 if (N->getValueType(0) == MVT::i32)
697 return Imm == (int32_t)cast<ConstantSDNode>(N)->getValue();
699 return Imm == (int64_t)cast<ConstantSDNode>(N)->getValue();
701 static bool isIntS16Immediate(SDOperand Op, short &Imm) {
702 return isIntS16Immediate(Op.Val, Imm);
706 /// SelectAddressRegReg - Given the specified addressed, check to see if it
707 /// can be represented as an indexed [r+r] operation. Returns false if it
708 /// can be more efficiently represented with [r+imm].
709 bool PPCTargetLowering::SelectAddressRegReg(SDOperand N, SDOperand &Base,
713 if (N.getOpcode() == ISD::ADD) {
714 if (isIntS16Immediate(N.getOperand(1), imm))
716 if (N.getOperand(1).getOpcode() == PPCISD::Lo)
719 Base = N.getOperand(0);
720 Index = N.getOperand(1);
722 } else if (N.getOpcode() == ISD::OR) {
723 if (isIntS16Immediate(N.getOperand(1), imm))
724 return false; // r+i can fold it if we can.
726 // If this is an or of disjoint bitfields, we can codegen this as an add
727 // (for better address arithmetic) if the LHS and RHS of the OR are provably
729 uint64_t LHSKnownZero, LHSKnownOne;
730 uint64_t RHSKnownZero, RHSKnownOne;
731 DAG.ComputeMaskedBits(N.getOperand(0), ~0U, LHSKnownZero, LHSKnownOne);
734 DAG.ComputeMaskedBits(N.getOperand(1), ~0U, RHSKnownZero, RHSKnownOne);
735 // If all of the bits are known zero on the LHS or RHS, the add won't
737 if ((LHSKnownZero | RHSKnownZero) == ~0U) {
738 Base = N.getOperand(0);
739 Index = N.getOperand(1);
748 /// Returns true if the address N can be represented by a base register plus
749 /// a signed 16-bit displacement [r+imm], and if it is not better
750 /// represented as reg+reg.
751 bool PPCTargetLowering::SelectAddressRegImm(SDOperand N, SDOperand &Disp,
752 SDOperand &Base, SelectionDAG &DAG){
753 // If this can be more profitably realized as r+r, fail.
754 if (SelectAddressRegReg(N, Disp, Base, DAG))
757 if (N.getOpcode() == ISD::ADD) {
759 if (isIntS16Immediate(N.getOperand(1), imm)) {
760 Disp = DAG.getTargetConstant((int)imm & 0xFFFF, MVT::i32);
761 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
762 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
764 Base = N.getOperand(0);
766 return true; // [r+i]
767 } else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
768 // Match LOAD (ADD (X, Lo(G))).
769 assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getValue()
770 && "Cannot handle constant offsets yet!");
771 Disp = N.getOperand(1).getOperand(0); // The global address.
772 assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
773 Disp.getOpcode() == ISD::TargetConstantPool ||
774 Disp.getOpcode() == ISD::TargetJumpTable);
775 Base = N.getOperand(0);
776 return true; // [&g+r]
778 } else if (N.getOpcode() == ISD::OR) {
780 if (isIntS16Immediate(N.getOperand(1), imm)) {
781 // If this is an or of disjoint bitfields, we can codegen this as an add
782 // (for better address arithmetic) if the LHS and RHS of the OR are
783 // provably disjoint.
784 uint64_t LHSKnownZero, LHSKnownOne;
785 DAG.ComputeMaskedBits(N.getOperand(0), ~0U, LHSKnownZero, LHSKnownOne);
786 if ((LHSKnownZero|~(unsigned)imm) == ~0U) {
787 // If all of the bits are known zero on the LHS or RHS, the add won't
789 Base = N.getOperand(0);
790 Disp = DAG.getTargetConstant((int)imm & 0xFFFF, MVT::i32);
794 } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
795 // Loading from a constant address.
797 // If this address fits entirely in a 16-bit sext immediate field, codegen
800 if (isIntS16Immediate(CN, Imm)) {
801 Disp = DAG.getTargetConstant(Imm, CN->getValueType(0));
802 Base = DAG.getRegister(PPC::R0, CN->getValueType(0));
806 // Handle 32-bit sext immediates with LIS + addr mode.
807 if (CN->getValueType(0) == MVT::i32 ||
808 (int64_t)CN->getValue() == (int)CN->getValue()) {
809 int Addr = (int)CN->getValue();
811 // Otherwise, break this down into an LIS + disp.
812 Disp = DAG.getTargetConstant((short)Addr, MVT::i32);
814 Base = DAG.getTargetConstant((Addr - (signed short)Addr) >> 16, MVT::i32);
815 unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
816 Base = SDOperand(DAG.getTargetNode(Opc, CN->getValueType(0), Base), 0);
821 Disp = DAG.getTargetConstant(0, getPointerTy());
822 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
823 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
826 return true; // [r+0]
829 /// SelectAddressRegRegOnly - Given the specified addressed, force it to be
830 /// represented as an indexed [r+r] operation.
831 bool PPCTargetLowering::SelectAddressRegRegOnly(SDOperand N, SDOperand &Base,
834 // Check to see if we can easily represent this as an [r+r] address. This
835 // will fail if it thinks that the address is more profitably represented as
836 // reg+imm, e.g. where imm = 0.
837 if (SelectAddressRegReg(N, Base, Index, DAG))
840 // If the operand is an addition, always emit this as [r+r], since this is
841 // better (for code size, and execution, as the memop does the add for free)
842 // than emitting an explicit add.
843 if (N.getOpcode() == ISD::ADD) {
844 Base = N.getOperand(0);
845 Index = N.getOperand(1);
849 // Otherwise, do it the hard way, using R0 as the base register.
850 Base = DAG.getRegister(PPC::R0, N.getValueType());
855 /// SelectAddressRegImmShift - Returns true if the address N can be
856 /// represented by a base register plus a signed 14-bit displacement
857 /// [r+imm*4]. Suitable for use by STD and friends.
858 bool PPCTargetLowering::SelectAddressRegImmShift(SDOperand N, SDOperand &Disp,
861 // If this can be more profitably realized as r+r, fail.
862 if (SelectAddressRegReg(N, Disp, Base, DAG))
865 if (N.getOpcode() == ISD::ADD) {
867 if (isIntS16Immediate(N.getOperand(1), imm) && (imm & 3) == 0) {
868 Disp = DAG.getTargetConstant(((int)imm & 0xFFFF) >> 2, MVT::i32);
869 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
870 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
872 Base = N.getOperand(0);
874 return true; // [r+i]
875 } else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
876 // Match LOAD (ADD (X, Lo(G))).
877 assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getValue()
878 && "Cannot handle constant offsets yet!");
879 Disp = N.getOperand(1).getOperand(0); // The global address.
880 assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
881 Disp.getOpcode() == ISD::TargetConstantPool ||
882 Disp.getOpcode() == ISD::TargetJumpTable);
883 Base = N.getOperand(0);
884 return true; // [&g+r]
886 } else if (N.getOpcode() == ISD::OR) {
888 if (isIntS16Immediate(N.getOperand(1), imm) && (imm & 3) == 0) {
889 // If this is an or of disjoint bitfields, we can codegen this as an add
890 // (for better address arithmetic) if the LHS and RHS of the OR are
891 // provably disjoint.
892 uint64_t LHSKnownZero, LHSKnownOne;
893 DAG.ComputeMaskedBits(N.getOperand(0), ~0U, LHSKnownZero, LHSKnownOne);
894 if ((LHSKnownZero|~(unsigned)imm) == ~0U) {
895 // If all of the bits are known zero on the LHS or RHS, the add won't
897 Base = N.getOperand(0);
898 Disp = DAG.getTargetConstant(((int)imm & 0xFFFF) >> 2, MVT::i32);
902 } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
903 // Loading from a constant address. Verify low two bits are clear.
904 if ((CN->getValue() & 3) == 0) {
905 // If this address fits entirely in a 14-bit sext immediate field, codegen
908 if (isIntS16Immediate(CN, Imm)) {
909 Disp = DAG.getTargetConstant((unsigned short)Imm >> 2, getPointerTy());
910 Base = DAG.getRegister(PPC::R0, CN->getValueType(0));
914 // Fold the low-part of 32-bit absolute addresses into addr mode.
915 if (CN->getValueType(0) == MVT::i32 ||
916 (int64_t)CN->getValue() == (int)CN->getValue()) {
917 int Addr = (int)CN->getValue();
919 // Otherwise, break this down into an LIS + disp.
920 Disp = DAG.getTargetConstant((short)Addr >> 2, MVT::i32);
922 Base = DAG.getTargetConstant((Addr-(signed short)Addr) >> 16, MVT::i32);
923 unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
924 Base = SDOperand(DAG.getTargetNode(Opc, CN->getValueType(0), Base), 0);
930 Disp = DAG.getTargetConstant(0, getPointerTy());
931 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
932 Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
935 return true; // [r+0]
939 /// getPreIndexedAddressParts - returns true by value, base pointer and
940 /// offset pointer and addressing mode by reference if the node's address
941 /// can be legally represented as pre-indexed load / store address.
942 bool PPCTargetLowering::getPreIndexedAddressParts(SDNode *N, SDOperand &Base,
944 ISD::MemIndexedMode &AM,
946 // Disabled by default for now.
947 if (!EnablePPCPreinc) return false;
951 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
952 Ptr = LD->getBasePtr();
953 VT = LD->getLoadedVT();
955 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
957 Ptr = ST->getBasePtr();
958 VT = ST->getStoredVT();
962 // PowerPC doesn't have preinc load/store instructions for vectors.
963 if (MVT::isVector(VT))
966 // TODO: Check reg+reg first.
968 // LDU/STU use reg+imm*4, others use reg+imm.
969 if (VT != MVT::i64) {
971 if (!SelectAddressRegImm(Ptr, Offset, Base, DAG))
975 if (!SelectAddressRegImmShift(Ptr, Offset, Base, DAG))
979 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
980 // PPC64 doesn't have lwau, but it does have lwaux. Reject preinc load of
981 // sext i32 to i64 when addr mode is r+i.
982 if (LD->getValueType(0) == MVT::i64 && LD->getLoadedVT() == MVT::i32 &&
983 LD->getExtensionType() == ISD::SEXTLOAD &&
984 isa<ConstantSDNode>(Offset))
992 //===----------------------------------------------------------------------===//
993 // LowerOperation implementation
994 //===----------------------------------------------------------------------===//
996 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
997 MVT::ValueType PtrVT = Op.getValueType();
998 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
999 Constant *C = CP->getConstVal();
1000 SDOperand CPI = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment());
1001 SDOperand Zero = DAG.getConstant(0, PtrVT);
1003 const TargetMachine &TM = DAG.getTarget();
1005 SDOperand Hi = DAG.getNode(PPCISD::Hi, PtrVT, CPI, Zero);
1006 SDOperand Lo = DAG.getNode(PPCISD::Lo, PtrVT, CPI, Zero);
1008 // If this is a non-darwin platform, we don't support non-static relo models
1010 if (TM.getRelocationModel() == Reloc::Static ||
1011 !TM.getSubtarget<PPCSubtarget>().isDarwin()) {
1012 // Generate non-pic code that has direct accesses to the constant pool.
1013 // The address of the global is just (hi(&g)+lo(&g)).
1014 return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1017 if (TM.getRelocationModel() == Reloc::PIC_) {
1018 // With PIC, the first instruction is actually "GR+hi(&G)".
1019 Hi = DAG.getNode(ISD::ADD, PtrVT,
1020 DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
1023 Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1027 static SDOperand LowerJumpTable(SDOperand Op, SelectionDAG &DAG) {
1028 MVT::ValueType PtrVT = Op.getValueType();
1029 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
1030 SDOperand JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
1031 SDOperand Zero = DAG.getConstant(0, PtrVT);
1033 const TargetMachine &TM = DAG.getTarget();
1035 SDOperand Hi = DAG.getNode(PPCISD::Hi, PtrVT, JTI, Zero);
1036 SDOperand Lo = DAG.getNode(PPCISD::Lo, PtrVT, JTI, Zero);
1038 // If this is a non-darwin platform, we don't support non-static relo models
1040 if (TM.getRelocationModel() == Reloc::Static ||
1041 !TM.getSubtarget<PPCSubtarget>().isDarwin()) {
1042 // Generate non-pic code that has direct accesses to the constant pool.
1043 // The address of the global is just (hi(&g)+lo(&g)).
1044 return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1047 if (TM.getRelocationModel() == Reloc::PIC_) {
1048 // With PIC, the first instruction is actually "GR+hi(&G)".
1049 Hi = DAG.getNode(ISD::ADD, PtrVT,
1050 DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
1053 Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1057 static SDOperand LowerGlobalTLSAddress(SDOperand Op, SelectionDAG &DAG) {
1058 assert(0 && "TLS not implemented for PPC.");
1061 static SDOperand LowerGlobalAddress(SDOperand Op, SelectionDAG &DAG) {
1062 MVT::ValueType PtrVT = Op.getValueType();
1063 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
1064 GlobalValue *GV = GSDN->getGlobal();
1065 SDOperand GA = DAG.getTargetGlobalAddress(GV, PtrVT, GSDN->getOffset());
1066 SDOperand Zero = DAG.getConstant(0, PtrVT);
1068 const TargetMachine &TM = DAG.getTarget();
1070 SDOperand Hi = DAG.getNode(PPCISD::Hi, PtrVT, GA, Zero);
1071 SDOperand Lo = DAG.getNode(PPCISD::Lo, PtrVT, GA, Zero);
1073 // If this is a non-darwin platform, we don't support non-static relo models
1075 if (TM.getRelocationModel() == Reloc::Static ||
1076 !TM.getSubtarget<PPCSubtarget>().isDarwin()) {
1077 // Generate non-pic code that has direct accesses to globals.
1078 // The address of the global is just (hi(&g)+lo(&g)).
1079 return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1082 if (TM.getRelocationModel() == Reloc::PIC_) {
1083 // With PIC, the first instruction is actually "GR+hi(&G)".
1084 Hi = DAG.getNode(ISD::ADD, PtrVT,
1085 DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
1088 Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
1090 if (!TM.getSubtarget<PPCSubtarget>().hasLazyResolverStub(GV))
1093 // If the global is weak or external, we have to go through the lazy
1095 return DAG.getLoad(PtrVT, DAG.getEntryNode(), Lo, NULL, 0);
1098 static SDOperand LowerSETCC(SDOperand Op, SelectionDAG &DAG) {
1099 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
1101 // If we're comparing for equality to zero, expose the fact that this is
1102 // implented as a ctlz/srl pair on ppc, so that the dag combiner can
1103 // fold the new nodes.
1104 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1105 if (C->isNullValue() && CC == ISD::SETEQ) {
1106 MVT::ValueType VT = Op.getOperand(0).getValueType();
1107 SDOperand Zext = Op.getOperand(0);
1108 if (VT < MVT::i32) {
1110 Zext = DAG.getNode(ISD::ZERO_EXTEND, VT, Op.getOperand(0));
1112 unsigned Log2b = Log2_32(MVT::getSizeInBits(VT));
1113 SDOperand Clz = DAG.getNode(ISD::CTLZ, VT, Zext);
1114 SDOperand Scc = DAG.getNode(ISD::SRL, VT, Clz,
1115 DAG.getConstant(Log2b, MVT::i32));
1116 return DAG.getNode(ISD::TRUNCATE, MVT::i32, Scc);
1118 // Leave comparisons against 0 and -1 alone for now, since they're usually
1119 // optimized. FIXME: revisit this when we can custom lower all setcc
1121 if (C->isAllOnesValue() || C->isNullValue())
1125 // If we have an integer seteq/setne, turn it into a compare against zero
1126 // by xor'ing the rhs with the lhs, which is faster than setting a
1127 // condition register, reading it back out, and masking the correct bit. The
1128 // normal approach here uses sub to do this instead of xor. Using xor exposes
1129 // the result to other bit-twiddling opportunities.
1130 MVT::ValueType LHSVT = Op.getOperand(0).getValueType();
1131 if (MVT::isInteger(LHSVT) && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
1132 MVT::ValueType VT = Op.getValueType();
1133 SDOperand Sub = DAG.getNode(ISD::XOR, LHSVT, Op.getOperand(0),
1135 return DAG.getSetCC(VT, Sub, DAG.getConstant(0, LHSVT), CC);
1140 static SDOperand LowerVAARG(SDOperand Op, SelectionDAG &DAG,
1141 int VarArgsFrameIndex,
1142 int VarArgsStackOffset,
1143 unsigned VarArgsNumGPR,
1144 unsigned VarArgsNumFPR,
1145 const PPCSubtarget &Subtarget) {
1147 assert(0 && "VAARG in ELF32 ABI not implemented yet!");
1150 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
1151 int VarArgsFrameIndex,
1152 int VarArgsStackOffset,
1153 unsigned VarArgsNumGPR,
1154 unsigned VarArgsNumFPR,
1155 const PPCSubtarget &Subtarget) {
1157 if (Subtarget.isMachoABI()) {
1158 // vastart just stores the address of the VarArgsFrameIndex slot into the
1159 // memory location argument.
1160 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1161 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1162 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
1163 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV->getValue(),
1167 // For ELF 32 ABI we follow the layout of the va_list struct.
1168 // We suppose the given va_list is already allocated.
1171 // char gpr; /* index into the array of 8 GPRs
1172 // * stored in the register save area
1173 // * gpr=0 corresponds to r3,
1174 // * gpr=1 to r4, etc.
1176 // char fpr; /* index into the array of 8 FPRs
1177 // * stored in the register save area
1178 // * fpr=0 corresponds to f1,
1179 // * fpr=1 to f2, etc.
1181 // char *overflow_arg_area;
1182 // /* location on stack that holds
1183 // * the next overflow argument
1185 // char *reg_save_area;
1186 // /* where r3:r10 and f1:f8 (if saved)
1192 SDOperand ArgGPR = DAG.getConstant(VarArgsNumGPR, MVT::i8);
1193 SDOperand ArgFPR = DAG.getConstant(VarArgsNumFPR, MVT::i8);
1196 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1198 SDOperand StackOffset = DAG.getFrameIndex(VarArgsStackOffset, PtrVT);
1199 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1201 SDOperand ConstFrameOffset = DAG.getConstant(MVT::getSizeInBits(PtrVT)/8,
1203 SDOperand ConstStackOffset = DAG.getConstant(MVT::getSizeInBits(PtrVT)/8 - 1,
1205 SDOperand ConstFPROffset = DAG.getConstant(1, PtrVT);
1207 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
1209 // Store first byte : number of int regs
1210 SDOperand firstStore = DAG.getStore(Op.getOperand(0), ArgGPR,
1211 Op.getOperand(1), SV->getValue(),
1213 SDOperand nextPtr = DAG.getNode(ISD::ADD, PtrVT, Op.getOperand(1),
1216 // Store second byte : number of float regs
1217 SDOperand secondStore = DAG.getStore(firstStore, ArgFPR, nextPtr,
1218 SV->getValue(), SV->getOffset());
1219 nextPtr = DAG.getNode(ISD::ADD, PtrVT, nextPtr, ConstStackOffset);
1221 // Store second word : arguments given on stack
1222 SDOperand thirdStore = DAG.getStore(secondStore, StackOffset, nextPtr,
1223 SV->getValue(), SV->getOffset());
1224 nextPtr = DAG.getNode(ISD::ADD, PtrVT, nextPtr, ConstFrameOffset);
1226 // Store third word : arguments given in registers
1227 return DAG.getStore(thirdStore, FR, nextPtr, SV->getValue(),
1232 #include "PPCGenCallingConv.inc"
1234 /// GetFPR - Get the set of FP registers that should be allocated for arguments,
1235 /// depending on which subtarget is selected.
1236 static const unsigned *GetFPR(const PPCSubtarget &Subtarget) {
1237 if (Subtarget.isMachoABI()) {
1238 static const unsigned FPR[] = {
1239 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
1240 PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
1246 static const unsigned FPR[] = {
1247 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
1253 static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
1254 int &VarArgsFrameIndex,
1255 int &VarArgsStackOffset,
1256 unsigned &VarArgsNumGPR,
1257 unsigned &VarArgsNumFPR,
1258 const PPCSubtarget &Subtarget) {
1259 // TODO: add description of PPC stack frame format, or at least some docs.
1261 MachineFunction &MF = DAG.getMachineFunction();
1262 MachineFrameInfo *MFI = MF.getFrameInfo();
1263 SSARegMap *RegMap = MF.getSSARegMap();
1264 SmallVector<SDOperand, 8> ArgValues;
1265 SDOperand Root = Op.getOperand(0);
1267 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1268 bool isPPC64 = PtrVT == MVT::i64;
1269 bool isMachoABI = Subtarget.isMachoABI();
1270 bool isELF32_ABI = Subtarget.isELF32_ABI();
1271 unsigned PtrByteSize = isPPC64 ? 8 : 4;
1273 unsigned ArgOffset = PPCFrameInfo::getLinkageSize(isPPC64, isMachoABI);
1275 static const unsigned GPR_32[] = { // 32-bit registers.
1276 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
1277 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
1279 static const unsigned GPR_64[] = { // 64-bit registers.
1280 PPC::X3, PPC::X4, PPC::X5, PPC::X6,
1281 PPC::X7, PPC::X8, PPC::X9, PPC::X10,
1284 static const unsigned *FPR = GetFPR(Subtarget);
1286 static const unsigned VR[] = {
1287 PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
1288 PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
1291 const unsigned Num_GPR_Regs = array_lengthof(GPR_32);
1292 const unsigned Num_FPR_Regs = isMachoABI ? 13 : 8;
1293 const unsigned Num_VR_Regs = array_lengthof( VR);
1295 unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
1297 const unsigned *GPR = isPPC64 ? GPR_64 : GPR_32;
1299 // Add DAG nodes to load the arguments or copy them out of registers. On
1300 // entry to a function on PPC, the arguments start after the linkage area,
1301 // although the first ones are often in registers.
1303 // In the ELF 32 ABI, GPRs and stack are double word align: an argument
1304 // represented with two words (long long or double) must be copied to an
1305 // even GPR_idx value or to an even ArgOffset value.
1307 for (unsigned ArgNo = 0, e = Op.Val->getNumValues()-1; ArgNo != e; ++ArgNo) {
1309 bool needsLoad = false;
1310 MVT::ValueType ObjectVT = Op.getValue(ArgNo).getValueType();
1311 unsigned ObjSize = MVT::getSizeInBits(ObjectVT)/8;
1312 unsigned ArgSize = ObjSize;
1313 unsigned Flags = cast<ConstantSDNode>(Op.getOperand(ArgNo+3))->getValue();
1314 unsigned AlignFlag = 1 << ISD::ParamFlags::OrigAlignmentOffs;
1315 // See if next argument requires stack alignment in ELF
1316 bool Expand = (ObjectVT == MVT::f64) || ((ArgNo + 1 < e) &&
1317 (cast<ConstantSDNode>(Op.getOperand(ArgNo+4))->getValue() & AlignFlag) &&
1318 (!(Flags & AlignFlag)));
1320 unsigned CurArgOffset = ArgOffset;
1322 default: assert(0 && "Unhandled argument type!");
1324 // Double word align in ELF
1325 if (Expand && isELF32_ABI) GPR_idx += (GPR_idx % 2);
1326 if (GPR_idx != Num_GPR_Regs) {
1327 unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
1328 MF.addLiveIn(GPR[GPR_idx], VReg);
1329 ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i32);
1333 ArgSize = PtrByteSize;
1335 // Stack align in ELF
1336 if (needsLoad && Expand && isELF32_ABI)
1337 ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
1338 // All int arguments reserve stack space in Macho ABI.
1339 if (isMachoABI || needsLoad) ArgOffset += PtrByteSize;
1342 case MVT::i64: // PPC64
1343 if (GPR_idx != Num_GPR_Regs) {
1344 unsigned VReg = RegMap->createVirtualRegister(&PPC::G8RCRegClass);
1345 MF.addLiveIn(GPR[GPR_idx], VReg);
1346 ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i64);
1351 // All int arguments reserve stack space in Macho ABI.
1352 if (isMachoABI || needsLoad) ArgOffset += 8;
1357 // Every 4 bytes of argument space consumes one of the GPRs available for
1358 // argument passing.
1359 if (GPR_idx != Num_GPR_Regs && isMachoABI) {
1361 if (ObjSize == 8 && GPR_idx != Num_GPR_Regs && !isPPC64)
1364 if (FPR_idx != Num_FPR_Regs) {
1366 if (ObjectVT == MVT::f32)
1367 VReg = RegMap->createVirtualRegister(&PPC::F4RCRegClass);
1369 VReg = RegMap->createVirtualRegister(&PPC::F8RCRegClass);
1370 MF.addLiveIn(FPR[FPR_idx], VReg);
1371 ArgVal = DAG.getCopyFromReg(Root, VReg, ObjectVT);
1377 // Stack align in ELF
1378 if (needsLoad && Expand && isELF32_ABI)
1379 ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
1380 // All FP arguments reserve stack space in Macho ABI.
1381 if (isMachoABI || needsLoad) ArgOffset += isPPC64 ? 8 : ObjSize;
1387 // Note that vector arguments in registers don't reserve stack space.
1388 if (VR_idx != Num_VR_Regs) {
1389 unsigned VReg = RegMap->createVirtualRegister(&PPC::VRRCRegClass);
1390 MF.addLiveIn(VR[VR_idx], VReg);
1391 ArgVal = DAG.getCopyFromReg(Root, VReg, ObjectVT);
1394 // This should be simple, but requires getting 16-byte aligned stack
1396 assert(0 && "Loading VR argument not implemented yet!");
1402 // We need to load the argument to a virtual register if we determined above
1403 // that we ran out of physical registers of the appropriate type
1405 // If the argument is actually used, emit a load from the right stack
1407 if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
1408 int FI = MFI->CreateFixedObject(ObjSize,
1409 CurArgOffset + (ArgSize - ObjSize));
1410 SDOperand FIN = DAG.getFrameIndex(FI, PtrVT);
1411 ArgVal = DAG.getLoad(ObjectVT, Root, FIN, NULL, 0);
1413 // Don't emit a dead load.
1414 ArgVal = DAG.getNode(ISD::UNDEF, ObjectVT);
1418 ArgValues.push_back(ArgVal);
1421 // If the function takes variable number of arguments, make a frame index for
1422 // the start of the first vararg value... for expansion of llvm.va_start.
1423 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
1428 VarArgsNumGPR = GPR_idx;
1429 VarArgsNumFPR = FPR_idx;
1431 // Make room for Num_GPR_Regs, Num_FPR_Regs and for a possible frame
1433 depth = -(Num_GPR_Regs * MVT::getSizeInBits(PtrVT)/8 +
1434 Num_FPR_Regs * MVT::getSizeInBits(MVT::f64)/8 +
1435 MVT::getSizeInBits(PtrVT)/8);
1437 VarArgsStackOffset = MFI->CreateFixedObject(MVT::getSizeInBits(PtrVT)/8,
1444 VarArgsFrameIndex = MFI->CreateFixedObject(MVT::getSizeInBits(PtrVT)/8,
1446 SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
1448 SmallVector<SDOperand, 8> MemOps;
1450 // In ELF 32 ABI, the fixed integer arguments of a variadic function are
1451 // stored to the VarArgsFrameIndex on the stack.
1453 for (GPR_idx = 0; GPR_idx != VarArgsNumGPR; ++GPR_idx) {
1454 SDOperand Val = DAG.getRegister(GPR[GPR_idx], PtrVT);
1455 SDOperand Store = DAG.getStore(Root, Val, FIN, NULL, 0);
1456 MemOps.push_back(Store);
1457 // Increment the address by four for the next argument to store
1458 SDOperand PtrOff = DAG.getConstant(MVT::getSizeInBits(PtrVT)/8, PtrVT);
1459 FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
1463 // If this function is vararg, store any remaining integer argument regs
1464 // to their spots on the stack so that they may be loaded by deferencing the
1465 // result of va_next.
1466 for (; GPR_idx != Num_GPR_Regs; ++GPR_idx) {
1469 VReg = RegMap->createVirtualRegister(&PPC::G8RCRegClass);
1471 VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
1473 MF.addLiveIn(GPR[GPR_idx], VReg);
1474 SDOperand Val = DAG.getCopyFromReg(Root, VReg, PtrVT);
1475 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
1476 MemOps.push_back(Store);
1477 // Increment the address by four for the next argument to store
1478 SDOperand PtrOff = DAG.getConstant(MVT::getSizeInBits(PtrVT)/8, PtrVT);
1479 FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
1482 // In ELF 32 ABI, the double arguments are stored to the VarArgsFrameIndex
1485 for (FPR_idx = 0; FPR_idx != VarArgsNumFPR; ++FPR_idx) {
1486 SDOperand Val = DAG.getRegister(FPR[FPR_idx], MVT::f64);
1487 SDOperand Store = DAG.getStore(Root, Val, FIN, NULL, 0);
1488 MemOps.push_back(Store);
1489 // Increment the address by eight for the next argument to store
1490 SDOperand PtrOff = DAG.getConstant(MVT::getSizeInBits(MVT::f64)/8,
1492 FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
1495 for (; FPR_idx != Num_FPR_Regs; ++FPR_idx) {
1497 VReg = RegMap->createVirtualRegister(&PPC::F8RCRegClass);
1499 MF.addLiveIn(FPR[FPR_idx], VReg);
1500 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::f64);
1501 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
1502 MemOps.push_back(Store);
1503 // Increment the address by eight for the next argument to store
1504 SDOperand PtrOff = DAG.getConstant(MVT::getSizeInBits(MVT::f64)/8,
1506 FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
1510 if (!MemOps.empty())
1511 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,&MemOps[0],MemOps.size());
1514 ArgValues.push_back(Root);
1516 // Return the new list of results.
1517 std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
1518 Op.Val->value_end());
1519 return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
1522 /// isCallCompatibleAddress - Return the immediate to use if the specified
1523 /// 32-bit value is representable in the immediate field of a BxA instruction.
1524 static SDNode *isBLACompatibleAddress(SDOperand Op, SelectionDAG &DAG) {
1525 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
1528 int Addr = C->getValue();
1529 if ((Addr & 3) != 0 || // Low 2 bits are implicitly zero.
1530 (Addr << 6 >> 6) != Addr)
1531 return 0; // Top 6 bits have to be sext of immediate.
1533 return DAG.getConstant((int)C->getValue() >> 2, MVT::i32).Val;
1537 static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG,
1538 const PPCSubtarget &Subtarget) {
1539 SDOperand Chain = Op.getOperand(0);
1540 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
1541 SDOperand Callee = Op.getOperand(4);
1542 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
1544 bool isMachoABI = Subtarget.isMachoABI();
1545 bool isELF32_ABI = Subtarget.isELF32_ABI();
1547 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1548 bool isPPC64 = PtrVT == MVT::i64;
1549 unsigned PtrByteSize = isPPC64 ? 8 : 4;
1551 // args_to_use will accumulate outgoing args for the PPCISD::CALL case in
1552 // SelectExpr to use to put the arguments in the appropriate registers.
1553 std::vector<SDOperand> args_to_use;
1555 // Count how many bytes are to be pushed on the stack, including the linkage
1556 // area, and parameter passing area. We start with 24/48 bytes, which is
1557 // prereserved space for [SP][CR][LR][3 x unused].
1558 unsigned NumBytes = PPCFrameInfo::getLinkageSize(isPPC64, isMachoABI);
1560 // Add up all the space actually used.
1561 for (unsigned i = 0; i != NumOps; ++i) {
1562 unsigned ArgSize =MVT::getSizeInBits(Op.getOperand(5+2*i).getValueType())/8;
1563 ArgSize = std::max(ArgSize, PtrByteSize);
1564 NumBytes += ArgSize;
1567 // The prolog code of the callee may store up to 8 GPR argument registers to
1568 // the stack, allowing va_start to index over them in memory if its varargs.
1569 // Because we cannot tell if this is needed on the caller side, we have to
1570 // conservatively assume that it is needed. As such, make sure we have at
1571 // least enough stack space for the caller to store the 8 GPRs.
1572 NumBytes = std::max(NumBytes,
1573 PPCFrameInfo::getMinCallFrameSize(isPPC64, isMachoABI));
1575 // Adjust the stack pointer for the new arguments...
1576 // These operations are automatically eliminated by the prolog/epilog pass
1577 Chain = DAG.getCALLSEQ_START(Chain,
1578 DAG.getConstant(NumBytes, PtrVT));
1580 // Set up a copy of the stack pointer for use loading and storing any
1581 // arguments that may not fit in the registers available for argument
1585 StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
1587 StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
1589 // Figure out which arguments are going to go in registers, and which in
1590 // memory. Also, if this is a vararg function, floating point operations
1591 // must be stored to our stack, and loaded into integer regs as well, if
1592 // any integer regs are available for argument passing.
1593 unsigned ArgOffset = PPCFrameInfo::getLinkageSize(isPPC64, isMachoABI);
1594 unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
1596 static const unsigned GPR_32[] = { // 32-bit registers.
1597 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
1598 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
1600 static const unsigned GPR_64[] = { // 64-bit registers.
1601 PPC::X3, PPC::X4, PPC::X5, PPC::X6,
1602 PPC::X7, PPC::X8, PPC::X9, PPC::X10,
1604 static const unsigned *FPR = GetFPR(Subtarget);
1606 static const unsigned VR[] = {
1607 PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
1608 PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
1610 const unsigned NumGPRs = array_lengthof(GPR_32);
1611 const unsigned NumFPRs = isMachoABI ? 13 : 8;
1612 const unsigned NumVRs = array_lengthof( VR);
1614 const unsigned *GPR = isPPC64 ? GPR_64 : GPR_32;
1616 std::vector<std::pair<unsigned, SDOperand> > RegsToPass;
1617 SmallVector<SDOperand, 8> MemOpChains;
1618 for (unsigned i = 0; i != NumOps; ++i) {
1620 SDOperand Arg = Op.getOperand(5+2*i);
1621 unsigned Flags = cast<ConstantSDNode>(Op.getOperand(5+2*i+1))->getValue();
1622 unsigned AlignFlag = 1 << ISD::ParamFlags::OrigAlignmentOffs;
1623 // See if next argument requires stack alignment in ELF
1624 unsigned next = 5+2*(i+1)+1;
1625 bool Expand = (Arg.getValueType() == MVT::f64) || ((i + 1 < NumOps) &&
1626 (cast<ConstantSDNode>(Op.getOperand(next))->getValue() & AlignFlag) &&
1627 (!(Flags & AlignFlag)));
1629 // PtrOff will be used to store the current argument to the stack if a
1630 // register cannot be found for it.
1633 // Stack align in ELF 32
1634 if (isELF32_ABI && Expand)
1635 PtrOff = DAG.getConstant(ArgOffset + ((ArgOffset/4) % 2) * PtrByteSize,
1636 StackPtr.getValueType());
1638 PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
1640 PtrOff = DAG.getNode(ISD::ADD, PtrVT, StackPtr, PtrOff);
1642 // On PPC64, promote integers to 64-bit values.
1643 if (isPPC64 && Arg.getValueType() == MVT::i32) {
1644 unsigned ExtOp = (Flags & 1) ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
1646 Arg = DAG.getNode(ExtOp, MVT::i64, Arg);
1649 switch (Arg.getValueType()) {
1650 default: assert(0 && "Unexpected ValueType for argument!");
1653 // Double word align in ELF
1654 if (isELF32_ABI && Expand) GPR_idx += (GPR_idx % 2);
1655 if (GPR_idx != NumGPRs) {
1656 RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Arg));
1658 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
1661 if (inMem || isMachoABI) {
1662 // Stack align in ELF
1663 if (isELF32_ABI && Expand)
1664 ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
1666 ArgOffset += PtrByteSize;
1672 // Float varargs need to be promoted to double.
1673 if (Arg.getValueType() == MVT::f32)
1674 Arg = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Arg);
1677 if (FPR_idx != NumFPRs) {
1678 RegsToPass.push_back(std::make_pair(FPR[FPR_idx++], Arg));
1681 SDOperand Store = DAG.getStore(Chain, Arg, PtrOff, NULL, 0);
1682 MemOpChains.push_back(Store);
1684 // Float varargs are always shadowed in available integer registers
1685 if (GPR_idx != NumGPRs) {
1686 SDOperand Load = DAG.getLoad(PtrVT, Store, PtrOff, NULL, 0);
1687 MemOpChains.push_back(Load.getValue(1));
1688 if (isMachoABI) RegsToPass.push_back(std::make_pair(GPR[GPR_idx++],
1691 if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 && !isPPC64){
1692 SDOperand ConstFour = DAG.getConstant(4, PtrOff.getValueType());
1693 PtrOff = DAG.getNode(ISD::ADD, PtrVT, PtrOff, ConstFour);
1694 SDOperand Load = DAG.getLoad(PtrVT, Store, PtrOff, NULL, 0);
1695 MemOpChains.push_back(Load.getValue(1));
1696 if (isMachoABI) RegsToPass.push_back(std::make_pair(GPR[GPR_idx++],
1700 // If we have any FPRs remaining, we may also have GPRs remaining.
1701 // Args passed in FPRs consume either 1 (f32) or 2 (f64) available
1704 if (GPR_idx != NumGPRs)
1706 if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 &&
1707 !isPPC64) // PPC64 has 64-bit GPR's obviously :)
1712 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
1715 if (inMem || isMachoABI) {
1716 // Stack align in ELF
1717 if (isELF32_ABI && Expand)
1718 ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
1722 ArgOffset += Arg.getValueType() == MVT::f32 ? 4 : 8;
1729 assert(!isVarArg && "Don't support passing vectors to varargs yet!");
1730 assert(VR_idx != NumVRs &&
1731 "Don't support passing more than 12 vector args yet!");
1732 RegsToPass.push_back(std::make_pair(VR[VR_idx++], Arg));
1736 if (!MemOpChains.empty())
1737 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
1738 &MemOpChains[0], MemOpChains.size());
1740 // Build a sequence of copy-to-reg nodes chained together with token chain
1741 // and flag operands which copy the outgoing args into the appropriate regs.
1743 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1744 Chain = DAG.getCopyToReg(Chain, RegsToPass[i].first, RegsToPass[i].second,
1746 InFlag = Chain.getValue(1);
1749 // With the ELF 32 ABI, set CR6 to true if this is a vararg call.
1750 if (isVarArg && isELF32_ABI) {
1751 SDOperand SetCR(DAG.getTargetNode(PPC::SETCR, MVT::i32), 0);
1752 Chain = DAG.getCopyToReg(Chain, PPC::CR6, SetCR, InFlag);
1753 InFlag = Chain.getValue(1);
1756 std::vector<MVT::ValueType> NodeTys;
1757 NodeTys.push_back(MVT::Other); // Returns a chain
1758 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
1760 SmallVector<SDOperand, 8> Ops;
1761 unsigned CallOpc = isMachoABI? PPCISD::CALL_Macho : PPCISD::CALL_ELF;
1763 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
1764 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
1765 // node so that legalize doesn't hack it.
1766 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
1767 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), Callee.getValueType());
1768 else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
1769 Callee = DAG.getTargetExternalSymbol(S->getSymbol(), Callee.getValueType());
1770 else if (SDNode *Dest = isBLACompatibleAddress(Callee, DAG))
1771 // If this is an absolute destination address, use the munged value.
1772 Callee = SDOperand(Dest, 0);
1774 // Otherwise, this is an indirect call. We have to use a MTCTR/BCTRL pair
1775 // to do the call, we can't use PPCISD::CALL.
1776 SDOperand MTCTROps[] = {Chain, Callee, InFlag};
1777 Chain = DAG.getNode(PPCISD::MTCTR, NodeTys, MTCTROps, 2+(InFlag.Val!=0));
1778 InFlag = Chain.getValue(1);
1780 // Copy the callee address into R12 on darwin.
1782 Chain = DAG.getCopyToReg(Chain, PPC::R12, Callee, InFlag);
1783 InFlag = Chain.getValue(1);
1787 NodeTys.push_back(MVT::Other);
1788 NodeTys.push_back(MVT::Flag);
1789 Ops.push_back(Chain);
1790 CallOpc = isMachoABI ? PPCISD::BCTRL_Macho : PPCISD::BCTRL_ELF;
1794 // If this is a direct call, pass the chain and the callee.
1796 Ops.push_back(Chain);
1797 Ops.push_back(Callee);
1800 // Add argument registers to the end of the list so that they are known live
1802 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1803 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1804 RegsToPass[i].second.getValueType()));
1807 Ops.push_back(InFlag);
1808 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
1809 InFlag = Chain.getValue(1);
1811 SDOperand ResultVals[3];
1812 unsigned NumResults = 0;
1815 // If the call has results, copy the values out of the ret val registers.
1816 switch (Op.Val->getValueType(0)) {
1817 default: assert(0 && "Unexpected ret value!");
1818 case MVT::Other: break;
1820 if (Op.Val->getValueType(1) == MVT::i32) {
1821 Chain = DAG.getCopyFromReg(Chain, PPC::R3, MVT::i32, InFlag).getValue(1);
1822 ResultVals[0] = Chain.getValue(0);
1823 Chain = DAG.getCopyFromReg(Chain, PPC::R4, MVT::i32,
1824 Chain.getValue(2)).getValue(1);
1825 ResultVals[1] = Chain.getValue(0);
1827 NodeTys.push_back(MVT::i32);
1829 Chain = DAG.getCopyFromReg(Chain, PPC::R3, MVT::i32, InFlag).getValue(1);
1830 ResultVals[0] = Chain.getValue(0);
1833 NodeTys.push_back(MVT::i32);
1836 Chain = DAG.getCopyFromReg(Chain, PPC::X3, MVT::i64, InFlag).getValue(1);
1837 ResultVals[0] = Chain.getValue(0);
1839 NodeTys.push_back(MVT::i64);
1842 if (Op.Val->getValueType(1) == MVT::f64) {
1843 Chain = DAG.getCopyFromReg(Chain, PPC::F1, MVT::f64, InFlag).getValue(1);
1844 ResultVals[0] = Chain.getValue(0);
1845 Chain = DAG.getCopyFromReg(Chain, PPC::F2, MVT::f64,
1846 Chain.getValue(2)).getValue(1);
1847 ResultVals[1] = Chain.getValue(0);
1849 NodeTys.push_back(MVT::f64);
1850 NodeTys.push_back(MVT::f64);
1853 // else fall through
1855 Chain = DAG.getCopyFromReg(Chain, PPC::F1, Op.Val->getValueType(0),
1856 InFlag).getValue(1);
1857 ResultVals[0] = Chain.getValue(0);
1859 NodeTys.push_back(Op.Val->getValueType(0));
1865 Chain = DAG.getCopyFromReg(Chain, PPC::V2, Op.Val->getValueType(0),
1866 InFlag).getValue(1);
1867 ResultVals[0] = Chain.getValue(0);
1869 NodeTys.push_back(Op.Val->getValueType(0));
1873 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
1874 DAG.getConstant(NumBytes, PtrVT));
1875 NodeTys.push_back(MVT::Other);
1877 // If the function returns void, just return the chain.
1878 if (NumResults == 0)
1881 // Otherwise, merge everything together with a MERGE_VALUES node.
1882 ResultVals[NumResults++] = Chain;
1883 SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys,
1884 ResultVals, NumResults);
1885 return Res.getValue(Op.ResNo);
1888 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG, TargetMachine &TM) {
1889 SmallVector<CCValAssign, 16> RVLocs;
1890 unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
1891 bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
1892 CCState CCInfo(CC, isVarArg, TM, RVLocs);
1893 CCInfo.AnalyzeReturn(Op.Val, RetCC_PPC);
1895 // If this is the first return lowered for this function, add the regs to the
1896 // liveout set for the function.
1897 if (DAG.getMachineFunction().liveout_empty()) {
1898 for (unsigned i = 0; i != RVLocs.size(); ++i)
1899 DAG.getMachineFunction().addLiveOut(RVLocs[i].getLocReg());
1902 SDOperand Chain = Op.getOperand(0);
1905 // Copy the result values into the output registers.
1906 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1907 CCValAssign &VA = RVLocs[i];
1908 assert(VA.isRegLoc() && "Can only return in registers!");
1909 Chain = DAG.getCopyToReg(Chain, VA.getLocReg(), Op.getOperand(i*2+1), Flag);
1910 Flag = Chain.getValue(1);
1914 return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Chain, Flag);
1916 return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Chain);
1919 static SDOperand LowerSTACKRESTORE(SDOperand Op, SelectionDAG &DAG,
1920 const PPCSubtarget &Subtarget) {
1921 // When we pop the dynamic allocation we need to restore the SP link.
1923 // Get the corect type for pointers.
1924 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1926 // Construct the stack pointer operand.
1927 bool IsPPC64 = Subtarget.isPPC64();
1928 unsigned SP = IsPPC64 ? PPC::X1 : PPC::R1;
1929 SDOperand StackPtr = DAG.getRegister(SP, PtrVT);
1931 // Get the operands for the STACKRESTORE.
1932 SDOperand Chain = Op.getOperand(0);
1933 SDOperand SaveSP = Op.getOperand(1);
1935 // Load the old link SP.
1936 SDOperand LoadLinkSP = DAG.getLoad(PtrVT, Chain, StackPtr, NULL, 0);
1938 // Restore the stack pointer.
1939 Chain = DAG.getCopyToReg(LoadLinkSP.getValue(1), SP, SaveSP);
1941 // Store the old link SP.
1942 return DAG.getStore(Chain, LoadLinkSP, StackPtr, NULL, 0);
1945 static SDOperand LowerDYNAMIC_STACKALLOC(SDOperand Op, SelectionDAG &DAG,
1946 const PPCSubtarget &Subtarget) {
1947 MachineFunction &MF = DAG.getMachineFunction();
1948 bool IsPPC64 = Subtarget.isPPC64();
1949 bool isMachoABI = Subtarget.isMachoABI();
1951 // Get current frame pointer save index. The users of this index will be
1952 // primarily DYNALLOC instructions.
1953 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
1954 int FPSI = FI->getFramePointerSaveIndex();
1956 // If the frame pointer save index hasn't been defined yet.
1958 // Find out what the fix offset of the frame pointer save area.
1959 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, isMachoABI);
1961 // Allocate the frame index for frame pointer save area.
1962 FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, FPOffset);
1964 FI->setFramePointerSaveIndex(FPSI);
1968 SDOperand Chain = Op.getOperand(0);
1969 SDOperand Size = Op.getOperand(1);
1971 // Get the corect type for pointers.
1972 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1974 SDOperand NegSize = DAG.getNode(ISD::SUB, PtrVT,
1975 DAG.getConstant(0, PtrVT), Size);
1976 // Construct a node for the frame pointer save index.
1977 SDOperand FPSIdx = DAG.getFrameIndex(FPSI, PtrVT);
1978 // Build a DYNALLOC node.
1979 SDOperand Ops[3] = { Chain, NegSize, FPSIdx };
1980 SDVTList VTs = DAG.getVTList(PtrVT, MVT::Other);
1981 return DAG.getNode(PPCISD::DYNALLOC, VTs, Ops, 3);
1985 /// LowerSELECT_CC - Lower floating point select_cc's into fsel instruction when
1987 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
1988 // Not FP? Not a fsel.
1989 if (!MVT::isFloatingPoint(Op.getOperand(0).getValueType()) ||
1990 !MVT::isFloatingPoint(Op.getOperand(2).getValueType()))
1993 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1995 // Cannot handle SETEQ/SETNE.
1996 if (CC == ISD::SETEQ || CC == ISD::SETNE) return SDOperand();
1998 MVT::ValueType ResVT = Op.getValueType();
1999 MVT::ValueType CmpVT = Op.getOperand(0).getValueType();
2000 SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
2001 SDOperand TV = Op.getOperand(2), FV = Op.getOperand(3);
2003 // If the RHS of the comparison is a 0.0, we don't need to do the
2004 // subtraction at all.
2005 if (isFloatingPointZero(RHS))
2007 default: break; // SETUO etc aren't handled by fsel.
2011 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
2015 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
2016 LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
2017 return DAG.getNode(PPCISD::FSEL, ResVT, LHS, TV, FV);
2021 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
2025 if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
2026 LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
2027 return DAG.getNode(PPCISD::FSEL, ResVT,
2028 DAG.getNode(ISD::FNEG, MVT::f64, LHS), TV, FV);
2033 default: break; // SETUO etc aren't handled by fsel.
2037 Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
2038 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
2039 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
2040 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
2044 Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
2045 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
2046 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
2047 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
2051 Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
2052 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
2053 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
2054 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
2058 Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
2059 if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
2060 Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
2061 return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
2066 static SDOperand LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
2067 assert(MVT::isFloatingPoint(Op.getOperand(0).getValueType()));
2068 SDOperand Src = Op.getOperand(0);
2069 if (Src.getValueType() == MVT::f32)
2070 Src = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Src);
2073 switch (Op.getValueType()) {
2074 default: assert(0 && "Unhandled FP_TO_SINT type in custom expander!");
2076 Tmp = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Src);
2079 Tmp = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Src);
2083 // Convert the FP value to an int value through memory.
2084 SDOperand FIPtr = DAG.CreateStackTemporary(MVT::f64);
2086 // Emit a store to the stack slot.
2087 SDOperand Chain = DAG.getStore(DAG.getEntryNode(), Tmp, FIPtr, NULL, 0);
2089 // Result is a load from the stack slot. If loading 4 bytes, make sure to
2091 if (Op.getValueType() == MVT::i32)
2092 FIPtr = DAG.getNode(ISD::ADD, FIPtr.getValueType(), FIPtr,
2093 DAG.getConstant(4, FIPtr.getValueType()));
2094 return DAG.getLoad(Op.getValueType(), Chain, FIPtr, NULL, 0);
2097 static SDOperand LowerFP_ROUND_INREG(SDOperand Op, SelectionDAG &DAG) {
2098 assert(Op.getValueType() == MVT::ppcf128);
2099 SDNode *Node = Op.Val;
2100 assert(Node->getOperand(0).getValueType() == MVT::ppcf128);
2101 assert(Node->getOperand(0).Val->getOpcode()==ISD::BUILD_PAIR);
2102 SDOperand Lo = Node->getOperand(0).Val->getOperand(0);
2103 SDOperand Hi = Node->getOperand(0).Val->getOperand(1);
2105 // This sequence changes FPSCR to do round-to-zero, adds the two halves
2106 // of the long double, and puts FPSCR back the way it was. We do not
2107 // actually model FPSCR.
2108 std::vector<MVT::ValueType> NodeTys;
2109 SDOperand Ops[4], Result, MFFSreg, InFlag, FPreg;
2111 NodeTys.push_back(MVT::f64); // Return register
2112 NodeTys.push_back(MVT::Flag); // Returns a flag for later insns
2113 Result = DAG.getNode(PPCISD::MFFS, NodeTys, &InFlag, 0);
2114 MFFSreg = Result.getValue(0);
2115 InFlag = Result.getValue(1);
2118 NodeTys.push_back(MVT::Flag); // Returns a flag
2119 Ops[0] = DAG.getConstant(31, MVT::i32);
2121 Result = DAG.getNode(PPCISD::MTFSB1, NodeTys, Ops, 2);
2122 InFlag = Result.getValue(0);
2125 NodeTys.push_back(MVT::Flag); // Returns a flag
2126 Ops[0] = DAG.getConstant(30, MVT::i32);
2128 Result = DAG.getNode(PPCISD::MTFSB0, NodeTys, Ops, 2);
2129 InFlag = Result.getValue(0);
2132 NodeTys.push_back(MVT::f64); // result of add
2133 NodeTys.push_back(MVT::Flag); // Returns a flag
2137 Result = DAG.getNode(PPCISD::FADDRTZ, NodeTys, Ops, 3);
2138 FPreg = Result.getValue(0);
2139 InFlag = Result.getValue(1);
2142 NodeTys.push_back(MVT::f64);
2143 Ops[0] = DAG.getConstant(1, MVT::i32);
2147 Result = DAG.getNode(PPCISD::MTFSF, NodeTys, Ops, 4);
2148 FPreg = Result.getValue(0);
2150 // We know the low half is about to be thrown away, so just use something
2152 return DAG.getNode(ISD::BUILD_PAIR, Lo.getValueType(), FPreg, FPreg);
2155 static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
2156 if (Op.getOperand(0).getValueType() == MVT::i64) {
2157 SDOperand Bits = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, Op.getOperand(0));
2158 SDOperand FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Bits);
2159 if (Op.getValueType() == MVT::f32)
2160 FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP);
2164 assert(Op.getOperand(0).getValueType() == MVT::i32 &&
2165 "Unhandled SINT_TO_FP type in custom expander!");
2166 // Since we only generate this in 64-bit mode, we can take advantage of
2167 // 64-bit registers. In particular, sign extend the input value into the
2168 // 64-bit register with extsw, store the WHOLE 64-bit value into the stack
2169 // then lfd it and fcfid it.
2170 MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
2171 int FrameIdx = FrameInfo->CreateStackObject(8, 8);
2172 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2173 SDOperand FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
2175 SDOperand Ext64 = DAG.getNode(PPCISD::EXTSW_32, MVT::i32,
2178 // STD the extended value into the stack slot.
2179 SDOperand Store = DAG.getNode(PPCISD::STD_32, MVT::Other,
2180 DAG.getEntryNode(), Ext64, FIdx,
2181 DAG.getSrcValue(NULL));
2182 // Load the value as a double.
2183 SDOperand Ld = DAG.getLoad(MVT::f64, Store, FIdx, NULL, 0);
2185 // FCFID it and return it.
2186 SDOperand FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Ld);
2187 if (Op.getValueType() == MVT::f32)
2188 FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP);
2192 static SDOperand LowerSHL_PARTS(SDOperand Op, SelectionDAG &DAG) {
2193 assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 &&
2194 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SHL!");
2196 // Expand into a bunch of logical ops. Note that these ops
2197 // depend on the PPC behavior for oversized shift amounts.
2198 SDOperand Lo = Op.getOperand(0);
2199 SDOperand Hi = Op.getOperand(1);
2200 SDOperand Amt = Op.getOperand(2);
2202 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
2203 DAG.getConstant(32, MVT::i32), Amt);
2204 SDOperand Tmp2 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Amt);
2205 SDOperand Tmp3 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Tmp1);
2206 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
2207 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
2208 DAG.getConstant(-32U, MVT::i32));
2209 SDOperand Tmp6 = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Tmp5);
2210 SDOperand OutHi = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
2211 SDOperand OutLo = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Amt);
2212 SDOperand OutOps[] = { OutLo, OutHi };
2213 return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32),
2217 static SDOperand LowerSRL_PARTS(SDOperand Op, SelectionDAG &DAG) {
2218 assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 &&
2219 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SRL!");
2221 // Otherwise, expand into a bunch of logical ops. Note that these ops
2222 // depend on the PPC behavior for oversized shift amounts.
2223 SDOperand Lo = Op.getOperand(0);
2224 SDOperand Hi = Op.getOperand(1);
2225 SDOperand Amt = Op.getOperand(2);
2227 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
2228 DAG.getConstant(32, MVT::i32), Amt);
2229 SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
2230 SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
2231 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
2232 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
2233 DAG.getConstant(-32U, MVT::i32));
2234 SDOperand Tmp6 = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Tmp5);
2235 SDOperand OutLo = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
2236 SDOperand OutHi = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Amt);
2237 SDOperand OutOps[] = { OutLo, OutHi };
2238 return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32),
2242 static SDOperand LowerSRA_PARTS(SDOperand Op, SelectionDAG &DAG) {
2243 assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 &&
2244 Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SRA!");
2246 // Otherwise, expand into a bunch of logical ops, followed by a select_cc.
2247 SDOperand Lo = Op.getOperand(0);
2248 SDOperand Hi = Op.getOperand(1);
2249 SDOperand Amt = Op.getOperand(2);
2251 SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
2252 DAG.getConstant(32, MVT::i32), Amt);
2253 SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
2254 SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
2255 SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
2256 SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
2257 DAG.getConstant(-32U, MVT::i32));
2258 SDOperand Tmp6 = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Tmp5);
2259 SDOperand OutHi = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Amt);
2260 SDOperand OutLo = DAG.getSelectCC(Tmp5, DAG.getConstant(0, MVT::i32),
2261 Tmp4, Tmp6, ISD::SETLE);
2262 SDOperand OutOps[] = { OutLo, OutHi };
2263 return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32),
2267 //===----------------------------------------------------------------------===//
2268 // Vector related lowering.
2271 // If this is a vector of constants or undefs, get the bits. A bit in
2272 // UndefBits is set if the corresponding element of the vector is an
2273 // ISD::UNDEF value. For undefs, the corresponding VectorBits values are
2274 // zero. Return true if this is not an array of constants, false if it is.
2276 static bool GetConstantBuildVectorBits(SDNode *BV, uint64_t VectorBits[2],
2277 uint64_t UndefBits[2]) {
2278 // Start with zero'd results.
2279 VectorBits[0] = VectorBits[1] = UndefBits[0] = UndefBits[1] = 0;
2281 unsigned EltBitSize = MVT::getSizeInBits(BV->getOperand(0).getValueType());
2282 for (unsigned i = 0, e = BV->getNumOperands(); i != e; ++i) {
2283 SDOperand OpVal = BV->getOperand(i);
2285 unsigned PartNo = i >= e/2; // In the upper 128 bits?
2286 unsigned SlotNo = e/2 - (i & (e/2-1))-1; // Which subpiece of the uint64_t.
2288 uint64_t EltBits = 0;
2289 if (OpVal.getOpcode() == ISD::UNDEF) {
2290 uint64_t EltUndefBits = ~0U >> (32-EltBitSize);
2291 UndefBits[PartNo] |= EltUndefBits << (SlotNo*EltBitSize);
2293 } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
2294 EltBits = CN->getValue() & (~0U >> (32-EltBitSize));
2295 } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
2296 assert(CN->getValueType(0) == MVT::f32 &&
2297 "Only one legal FP vector type!");
2298 EltBits = FloatToBits(CN->getValueAPF().convertToFloat());
2300 // Nonconstant element.
2304 VectorBits[PartNo] |= EltBits << (SlotNo*EltBitSize);
2307 //printf("%llx %llx %llx %llx\n",
2308 // VectorBits[0], VectorBits[1], UndefBits[0], UndefBits[1]);
2312 // If this is a splat (repetition) of a value across the whole vector, return
2313 // the smallest size that splats it. For example, "0x01010101010101..." is a
2314 // splat of 0x01, 0x0101, and 0x01010101. We return SplatBits = 0x01 and
2315 // SplatSize = 1 byte.
2316 static bool isConstantSplat(const uint64_t Bits128[2],
2317 const uint64_t Undef128[2],
2318 unsigned &SplatBits, unsigned &SplatUndef,
2319 unsigned &SplatSize) {
2321 // Don't let undefs prevent splats from matching. See if the top 64-bits are
2322 // the same as the lower 64-bits, ignoring undefs.
2323 if ((Bits128[0] & ~Undef128[1]) != (Bits128[1] & ~Undef128[0]))
2324 return false; // Can't be a splat if two pieces don't match.
2326 uint64_t Bits64 = Bits128[0] | Bits128[1];
2327 uint64_t Undef64 = Undef128[0] & Undef128[1];
2329 // Check that the top 32-bits are the same as the lower 32-bits, ignoring
2331 if ((Bits64 & (~Undef64 >> 32)) != ((Bits64 >> 32) & ~Undef64))
2332 return false; // Can't be a splat if two pieces don't match.
2334 uint32_t Bits32 = uint32_t(Bits64) | uint32_t(Bits64 >> 32);
2335 uint32_t Undef32 = uint32_t(Undef64) & uint32_t(Undef64 >> 32);
2337 // If the top 16-bits are different than the lower 16-bits, ignoring
2338 // undefs, we have an i32 splat.
2339 if ((Bits32 & (~Undef32 >> 16)) != ((Bits32 >> 16) & ~Undef32)) {
2341 SplatUndef = Undef32;
2346 uint16_t Bits16 = uint16_t(Bits32) | uint16_t(Bits32 >> 16);
2347 uint16_t Undef16 = uint16_t(Undef32) & uint16_t(Undef32 >> 16);
2349 // If the top 8-bits are different than the lower 8-bits, ignoring
2350 // undefs, we have an i16 splat.
2351 if ((Bits16 & (uint16_t(~Undef16) >> 8)) != ((Bits16 >> 8) & ~Undef16)) {
2353 SplatUndef = Undef16;
2358 // Otherwise, we have an 8-bit splat.
2359 SplatBits = uint8_t(Bits16) | uint8_t(Bits16 >> 8);
2360 SplatUndef = uint8_t(Undef16) & uint8_t(Undef16 >> 8);
2365 /// BuildSplatI - Build a canonical splati of Val with an element size of
2366 /// SplatSize. Cast the result to VT.
2367 static SDOperand BuildSplatI(int Val, unsigned SplatSize, MVT::ValueType VT,
2368 SelectionDAG &DAG) {
2369 assert(Val >= -16 && Val <= 15 && "vsplti is out of range!");
2371 static const MVT::ValueType VTys[] = { // canonical VT to use for each size.
2372 MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
2375 MVT::ValueType ReqVT = VT != MVT::Other ? VT : VTys[SplatSize-1];
2377 // Force vspltis[hw] -1 to vspltisb -1 to canonicalize.
2381 MVT::ValueType CanonicalVT = VTys[SplatSize-1];
2383 // Build a canonical splat for this value.
2384 SDOperand Elt = DAG.getConstant(Val, MVT::getVectorElementType(CanonicalVT));
2385 SmallVector<SDOperand, 8> Ops;
2386 Ops.assign(MVT::getVectorNumElements(CanonicalVT), Elt);
2387 SDOperand Res = DAG.getNode(ISD::BUILD_VECTOR, CanonicalVT,
2388 &Ops[0], Ops.size());
2389 return DAG.getNode(ISD::BIT_CONVERT, ReqVT, Res);
2392 /// BuildIntrinsicOp - Return a binary operator intrinsic node with the
2393 /// specified intrinsic ID.
2394 static SDOperand BuildIntrinsicOp(unsigned IID, SDOperand LHS, SDOperand RHS,
2396 MVT::ValueType DestVT = MVT::Other) {
2397 if (DestVT == MVT::Other) DestVT = LHS.getValueType();
2398 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DestVT,
2399 DAG.getConstant(IID, MVT::i32), LHS, RHS);
2402 /// BuildIntrinsicOp - Return a ternary operator intrinsic node with the
2403 /// specified intrinsic ID.
2404 static SDOperand BuildIntrinsicOp(unsigned IID, SDOperand Op0, SDOperand Op1,
2405 SDOperand Op2, SelectionDAG &DAG,
2406 MVT::ValueType DestVT = MVT::Other) {
2407 if (DestVT == MVT::Other) DestVT = Op0.getValueType();
2408 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DestVT,
2409 DAG.getConstant(IID, MVT::i32), Op0, Op1, Op2);
2413 /// BuildVSLDOI - Return a VECTOR_SHUFFLE that is a vsldoi of the specified
2414 /// amount. The result has the specified value type.
2415 static SDOperand BuildVSLDOI(SDOperand LHS, SDOperand RHS, unsigned Amt,
2416 MVT::ValueType VT, SelectionDAG &DAG) {
2417 // Force LHS/RHS to be the right type.
2418 LHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, LHS);
2419 RHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, RHS);
2422 for (unsigned i = 0; i != 16; ++i)
2423 Ops[i] = DAG.getConstant(i+Amt, MVT::i32);
2424 SDOperand T = DAG.getNode(ISD::VECTOR_SHUFFLE, MVT::v16i8, LHS, RHS,
2425 DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops,16));
2426 return DAG.getNode(ISD::BIT_CONVERT, VT, T);
2429 // If this is a case we can't handle, return null and let the default
2430 // expansion code take care of it. If we CAN select this case, and if it
2431 // selects to a single instruction, return Op. Otherwise, if we can codegen
2432 // this case more efficiently than a constant pool load, lower it to the
2433 // sequence of ops that should be used.
2434 static SDOperand LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
2435 // If this is a vector of constants or undefs, get the bits. A bit in
2436 // UndefBits is set if the corresponding element of the vector is an
2437 // ISD::UNDEF value. For undefs, the corresponding VectorBits values are
2439 uint64_t VectorBits[2];
2440 uint64_t UndefBits[2];
2441 if (GetConstantBuildVectorBits(Op.Val, VectorBits, UndefBits))
2442 return SDOperand(); // Not a constant vector.
2444 // If this is a splat (repetition) of a value across the whole vector, return
2445 // the smallest size that splats it. For example, "0x01010101010101..." is a
2446 // splat of 0x01, 0x0101, and 0x01010101. We return SplatBits = 0x01 and
2447 // SplatSize = 1 byte.
2448 unsigned SplatBits, SplatUndef, SplatSize;
2449 if (isConstantSplat(VectorBits, UndefBits, SplatBits, SplatUndef, SplatSize)){
2450 bool HasAnyUndefs = (UndefBits[0] | UndefBits[1]) != 0;
2452 // First, handle single instruction cases.
2455 if (SplatBits == 0) {
2456 // Canonicalize all zero vectors to be v4i32.
2457 if (Op.getValueType() != MVT::v4i32 || HasAnyUndefs) {
2458 SDOperand Z = DAG.getConstant(0, MVT::i32);
2459 Z = DAG.getNode(ISD::BUILD_VECTOR, MVT::v4i32, Z, Z, Z, Z);
2460 Op = DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Z);
2465 // If the sign extended value is in the range [-16,15], use VSPLTI[bhw].
2466 int32_t SextVal= int32_t(SplatBits << (32-8*SplatSize)) >> (32-8*SplatSize);
2467 if (SextVal >= -16 && SextVal <= 15)
2468 return BuildSplatI(SextVal, SplatSize, Op.getValueType(), DAG);
2471 // Two instruction sequences.
2473 // If this value is in the range [-32,30] and is even, use:
2474 // tmp = VSPLTI[bhw], result = add tmp, tmp
2475 if (SextVal >= -32 && SextVal <= 30 && (SextVal & 1) == 0) {
2476 Op = BuildSplatI(SextVal >> 1, SplatSize, Op.getValueType(), DAG);
2477 return DAG.getNode(ISD::ADD, Op.getValueType(), Op, Op);
2480 // If this is 0x8000_0000 x 4, turn into vspltisw + vslw. If it is
2481 // 0x7FFF_FFFF x 4, turn it into not(0x8000_0000). This is important
2483 if (SplatSize == 4 && SplatBits == (0x7FFFFFFF&~SplatUndef)) {
2484 // Make -1 and vspltisw -1:
2485 SDOperand OnesV = BuildSplatI(-1, 4, MVT::v4i32, DAG);
2487 // Make the VSLW intrinsic, computing 0x8000_0000.
2488 SDOperand Res = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, OnesV,
2491 // xor by OnesV to invert it.
2492 Res = DAG.getNode(ISD::XOR, MVT::v4i32, Res, OnesV);
2493 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
2496 // Check to see if this is a wide variety of vsplti*, binop self cases.
2497 unsigned SplatBitSize = SplatSize*8;
2498 static const signed char SplatCsts[] = {
2499 -1, 1, -2, 2, -3, 3, -4, 4, -5, 5, -6, 6, -7, 7,
2500 -8, 8, -9, 9, -10, 10, -11, 11, -12, 12, -13, 13, 14, -14, 15, -15, -16
2503 for (unsigned idx = 0; idx < array_lengthof(SplatCsts); ++idx) {
2504 // Indirect through the SplatCsts array so that we favor 'vsplti -1' for
2505 // cases which are ambiguous (e.g. formation of 0x8000_0000). 'vsplti -1'
2506 int i = SplatCsts[idx];
2508 // Figure out what shift amount will be used by altivec if shifted by i in
2510 unsigned TypeShiftAmt = i & (SplatBitSize-1);
2512 // vsplti + shl self.
2513 if (SextVal == (i << (int)TypeShiftAmt)) {
2514 SDOperand Res = BuildSplatI(i, SplatSize, MVT::Other, DAG);
2515 static const unsigned IIDs[] = { // Intrinsic to use for each size.
2516 Intrinsic::ppc_altivec_vslb, Intrinsic::ppc_altivec_vslh, 0,
2517 Intrinsic::ppc_altivec_vslw
2519 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG);
2520 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
2523 // vsplti + srl self.
2524 if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
2525 SDOperand Res = BuildSplatI(i, SplatSize, MVT::Other, DAG);
2526 static const unsigned IIDs[] = { // Intrinsic to use for each size.
2527 Intrinsic::ppc_altivec_vsrb, Intrinsic::ppc_altivec_vsrh, 0,
2528 Intrinsic::ppc_altivec_vsrw
2530 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG);
2531 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
2534 // vsplti + sra self.
2535 if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
2536 SDOperand Res = BuildSplatI(i, SplatSize, MVT::Other, DAG);
2537 static const unsigned IIDs[] = { // Intrinsic to use for each size.
2538 Intrinsic::ppc_altivec_vsrab, Intrinsic::ppc_altivec_vsrah, 0,
2539 Intrinsic::ppc_altivec_vsraw
2541 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG);
2542 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
2545 // vsplti + rol self.
2546 if (SextVal == (int)(((unsigned)i << TypeShiftAmt) |
2547 ((unsigned)i >> (SplatBitSize-TypeShiftAmt)))) {
2548 SDOperand Res = BuildSplatI(i, SplatSize, MVT::Other, DAG);
2549 static const unsigned IIDs[] = { // Intrinsic to use for each size.
2550 Intrinsic::ppc_altivec_vrlb, Intrinsic::ppc_altivec_vrlh, 0,
2551 Intrinsic::ppc_altivec_vrlw
2553 Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG);
2554 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
2557 // t = vsplti c, result = vsldoi t, t, 1
2558 if (SextVal == ((i << 8) | (i >> (TypeShiftAmt-8)))) {
2559 SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
2560 return BuildVSLDOI(T, T, 1, Op.getValueType(), DAG);
2562 // t = vsplti c, result = vsldoi t, t, 2
2563 if (SextVal == ((i << 16) | (i >> (TypeShiftAmt-16)))) {
2564 SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
2565 return BuildVSLDOI(T, T, 2, Op.getValueType(), DAG);
2567 // t = vsplti c, result = vsldoi t, t, 3
2568 if (SextVal == ((i << 24) | (i >> (TypeShiftAmt-24)))) {
2569 SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
2570 return BuildVSLDOI(T, T, 3, Op.getValueType(), DAG);
2574 // Three instruction sequences.
2576 // Odd, in range [17,31]: (vsplti C)-(vsplti -16).
2577 if (SextVal >= 0 && SextVal <= 31) {
2578 SDOperand LHS = BuildSplatI(SextVal-16, SplatSize, MVT::Other, DAG);
2579 SDOperand RHS = BuildSplatI(-16, SplatSize, MVT::Other, DAG);
2580 LHS = DAG.getNode(ISD::SUB, LHS.getValueType(), LHS, RHS);
2581 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), LHS);
2583 // Odd, in range [-31,-17]: (vsplti C)+(vsplti -16).
2584 if (SextVal >= -31 && SextVal <= 0) {
2585 SDOperand LHS = BuildSplatI(SextVal+16, SplatSize, MVT::Other, DAG);
2586 SDOperand RHS = BuildSplatI(-16, SplatSize, MVT::Other, DAG);
2587 LHS = DAG.getNode(ISD::ADD, LHS.getValueType(), LHS, RHS);
2588 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), LHS);
2595 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
2596 /// the specified operations to build the shuffle.
2597 static SDOperand GeneratePerfectShuffle(unsigned PFEntry, SDOperand LHS,
2598 SDOperand RHS, SelectionDAG &DAG) {
2599 unsigned OpNum = (PFEntry >> 26) & 0x0F;
2600 unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
2601 unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
2604 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
2616 if (OpNum == OP_COPY) {
2617 if (LHSID == (1*9+2)*9+3) return LHS;
2618 assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
2622 SDOperand OpLHS, OpRHS;
2623 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG);
2624 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG);
2626 unsigned ShufIdxs[16];
2628 default: assert(0 && "Unknown i32 permute!");
2630 ShufIdxs[ 0] = 0; ShufIdxs[ 1] = 1; ShufIdxs[ 2] = 2; ShufIdxs[ 3] = 3;
2631 ShufIdxs[ 4] = 16; ShufIdxs[ 5] = 17; ShufIdxs[ 6] = 18; ShufIdxs[ 7] = 19;
2632 ShufIdxs[ 8] = 4; ShufIdxs[ 9] = 5; ShufIdxs[10] = 6; ShufIdxs[11] = 7;
2633 ShufIdxs[12] = 20; ShufIdxs[13] = 21; ShufIdxs[14] = 22; ShufIdxs[15] = 23;
2636 ShufIdxs[ 0] = 8; ShufIdxs[ 1] = 9; ShufIdxs[ 2] = 10; ShufIdxs[ 3] = 11;
2637 ShufIdxs[ 4] = 24; ShufIdxs[ 5] = 25; ShufIdxs[ 6] = 26; ShufIdxs[ 7] = 27;
2638 ShufIdxs[ 8] = 12; ShufIdxs[ 9] = 13; ShufIdxs[10] = 14; ShufIdxs[11] = 15;
2639 ShufIdxs[12] = 28; ShufIdxs[13] = 29; ShufIdxs[14] = 30; ShufIdxs[15] = 31;
2642 for (unsigned i = 0; i != 16; ++i)
2643 ShufIdxs[i] = (i&3)+0;
2646 for (unsigned i = 0; i != 16; ++i)
2647 ShufIdxs[i] = (i&3)+4;
2650 for (unsigned i = 0; i != 16; ++i)
2651 ShufIdxs[i] = (i&3)+8;
2654 for (unsigned i = 0; i != 16; ++i)
2655 ShufIdxs[i] = (i&3)+12;
2658 return BuildVSLDOI(OpLHS, OpRHS, 4, OpLHS.getValueType(), DAG);
2660 return BuildVSLDOI(OpLHS, OpRHS, 8, OpLHS.getValueType(), DAG);
2662 return BuildVSLDOI(OpLHS, OpRHS, 12, OpLHS.getValueType(), DAG);
2665 for (unsigned i = 0; i != 16; ++i)
2666 Ops[i] = DAG.getConstant(ShufIdxs[i], MVT::i32);
2668 return DAG.getNode(ISD::VECTOR_SHUFFLE, OpLHS.getValueType(), OpLHS, OpRHS,
2669 DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops, 16));
2672 /// LowerVECTOR_SHUFFLE - Return the code we lower for VECTOR_SHUFFLE. If this
2673 /// is a shuffle we can handle in a single instruction, return it. Otherwise,
2674 /// return the code it can be lowered into. Worst case, it can always be
2675 /// lowered into a vperm.
2676 static SDOperand LowerVECTOR_SHUFFLE(SDOperand Op, SelectionDAG &DAG) {
2677 SDOperand V1 = Op.getOperand(0);
2678 SDOperand V2 = Op.getOperand(1);
2679 SDOperand PermMask = Op.getOperand(2);
2681 // Cases that are handled by instructions that take permute immediates
2682 // (such as vsplt*) should be left as VECTOR_SHUFFLE nodes so they can be
2683 // selected by the instruction selector.
2684 if (V2.getOpcode() == ISD::UNDEF) {
2685 if (PPC::isSplatShuffleMask(PermMask.Val, 1) ||
2686 PPC::isSplatShuffleMask(PermMask.Val, 2) ||
2687 PPC::isSplatShuffleMask(PermMask.Val, 4) ||
2688 PPC::isVPKUWUMShuffleMask(PermMask.Val, true) ||
2689 PPC::isVPKUHUMShuffleMask(PermMask.Val, true) ||
2690 PPC::isVSLDOIShuffleMask(PermMask.Val, true) != -1 ||
2691 PPC::isVMRGLShuffleMask(PermMask.Val, 1, true) ||
2692 PPC::isVMRGLShuffleMask(PermMask.Val, 2, true) ||
2693 PPC::isVMRGLShuffleMask(PermMask.Val, 4, true) ||
2694 PPC::isVMRGHShuffleMask(PermMask.Val, 1, true) ||
2695 PPC::isVMRGHShuffleMask(PermMask.Val, 2, true) ||
2696 PPC::isVMRGHShuffleMask(PermMask.Val, 4, true)) {
2701 // Altivec has a variety of "shuffle immediates" that take two vector inputs
2702 // and produce a fixed permutation. If any of these match, do not lower to
2704 if (PPC::isVPKUWUMShuffleMask(PermMask.Val, false) ||
2705 PPC::isVPKUHUMShuffleMask(PermMask.Val, false) ||
2706 PPC::isVSLDOIShuffleMask(PermMask.Val, false) != -1 ||
2707 PPC::isVMRGLShuffleMask(PermMask.Val, 1, false) ||
2708 PPC::isVMRGLShuffleMask(PermMask.Val, 2, false) ||
2709 PPC::isVMRGLShuffleMask(PermMask.Val, 4, false) ||
2710 PPC::isVMRGHShuffleMask(PermMask.Val, 1, false) ||
2711 PPC::isVMRGHShuffleMask(PermMask.Val, 2, false) ||
2712 PPC::isVMRGHShuffleMask(PermMask.Val, 4, false))
2715 // Check to see if this is a shuffle of 4-byte values. If so, we can use our
2716 // perfect shuffle table to emit an optimal matching sequence.
2717 unsigned PFIndexes[4];
2718 bool isFourElementShuffle = true;
2719 for (unsigned i = 0; i != 4 && isFourElementShuffle; ++i) { // Element number
2720 unsigned EltNo = 8; // Start out undef.
2721 for (unsigned j = 0; j != 4; ++j) { // Intra-element byte.
2722 if (PermMask.getOperand(i*4+j).getOpcode() == ISD::UNDEF)
2723 continue; // Undef, ignore it.
2725 unsigned ByteSource =
2726 cast<ConstantSDNode>(PermMask.getOperand(i*4+j))->getValue();
2727 if ((ByteSource & 3) != j) {
2728 isFourElementShuffle = false;
2733 EltNo = ByteSource/4;
2734 } else if (EltNo != ByteSource/4) {
2735 isFourElementShuffle = false;
2739 PFIndexes[i] = EltNo;
2742 // If this shuffle can be expressed as a shuffle of 4-byte elements, use the
2743 // perfect shuffle vector to determine if it is cost effective to do this as
2744 // discrete instructions, or whether we should use a vperm.
2745 if (isFourElementShuffle) {
2746 // Compute the index in the perfect shuffle table.
2747 unsigned PFTableIndex =
2748 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
2750 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
2751 unsigned Cost = (PFEntry >> 30);
2753 // Determining when to avoid vperm is tricky. Many things affect the cost
2754 // of vperm, particularly how many times the perm mask needs to be computed.
2755 // For example, if the perm mask can be hoisted out of a loop or is already
2756 // used (perhaps because there are multiple permutes with the same shuffle
2757 // mask?) the vperm has a cost of 1. OTOH, hoisting the permute mask out of
2758 // the loop requires an extra register.
2760 // As a compromise, we only emit discrete instructions if the shuffle can be
2761 // generated in 3 or fewer operations. When we have loop information
2762 // available, if this block is within a loop, we should avoid using vperm
2763 // for 3-operation perms and use a constant pool load instead.
2765 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG);
2768 // Lower this to a VPERM(V1, V2, V3) expression, where V3 is a constant
2769 // vector that will get spilled to the constant pool.
2770 if (V2.getOpcode() == ISD::UNDEF) V2 = V1;
2772 // The SHUFFLE_VECTOR mask is almost exactly what we want for vperm, except
2773 // that it is in input element units, not in bytes. Convert now.
2774 MVT::ValueType EltVT = MVT::getVectorElementType(V1.getValueType());
2775 unsigned BytesPerElement = MVT::getSizeInBits(EltVT)/8;
2777 SmallVector<SDOperand, 16> ResultMask;
2778 for (unsigned i = 0, e = PermMask.getNumOperands(); i != e; ++i) {
2780 if (PermMask.getOperand(i).getOpcode() == ISD::UNDEF)
2783 SrcElt = cast<ConstantSDNode>(PermMask.getOperand(i))->getValue();
2785 for (unsigned j = 0; j != BytesPerElement; ++j)
2786 ResultMask.push_back(DAG.getConstant(SrcElt*BytesPerElement+j,
2790 SDOperand VPermMask = DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8,
2791 &ResultMask[0], ResultMask.size());
2792 return DAG.getNode(PPCISD::VPERM, V1.getValueType(), V1, V2, VPermMask);
2795 /// getAltivecCompareInfo - Given an intrinsic, return false if it is not an
2796 /// altivec comparison. If it is, return true and fill in Opc/isDot with
2797 /// information about the intrinsic.
2798 static bool getAltivecCompareInfo(SDOperand Intrin, int &CompareOpc,
2800 unsigned IntrinsicID = cast<ConstantSDNode>(Intrin.getOperand(0))->getValue();
2803 switch (IntrinsicID) {
2804 default: return false;
2805 // Comparison predicates.
2806 case Intrinsic::ppc_altivec_vcmpbfp_p: CompareOpc = 966; isDot = 1; break;
2807 case Intrinsic::ppc_altivec_vcmpeqfp_p: CompareOpc = 198; isDot = 1; break;
2808 case Intrinsic::ppc_altivec_vcmpequb_p: CompareOpc = 6; isDot = 1; break;
2809 case Intrinsic::ppc_altivec_vcmpequh_p: CompareOpc = 70; isDot = 1; break;
2810 case Intrinsic::ppc_altivec_vcmpequw_p: CompareOpc = 134; isDot = 1; break;
2811 case Intrinsic::ppc_altivec_vcmpgefp_p: CompareOpc = 454; isDot = 1; break;
2812 case Intrinsic::ppc_altivec_vcmpgtfp_p: CompareOpc = 710; isDot = 1; break;
2813 case Intrinsic::ppc_altivec_vcmpgtsb_p: CompareOpc = 774; isDot = 1; break;
2814 case Intrinsic::ppc_altivec_vcmpgtsh_p: CompareOpc = 838; isDot = 1; break;
2815 case Intrinsic::ppc_altivec_vcmpgtsw_p: CompareOpc = 902; isDot = 1; break;
2816 case Intrinsic::ppc_altivec_vcmpgtub_p: CompareOpc = 518; isDot = 1; break;
2817 case Intrinsic::ppc_altivec_vcmpgtuh_p: CompareOpc = 582; isDot = 1; break;
2818 case Intrinsic::ppc_altivec_vcmpgtuw_p: CompareOpc = 646; isDot = 1; break;
2820 // Normal Comparisons.
2821 case Intrinsic::ppc_altivec_vcmpbfp: CompareOpc = 966; isDot = 0; break;
2822 case Intrinsic::ppc_altivec_vcmpeqfp: CompareOpc = 198; isDot = 0; break;
2823 case Intrinsic::ppc_altivec_vcmpequb: CompareOpc = 6; isDot = 0; break;
2824 case Intrinsic::ppc_altivec_vcmpequh: CompareOpc = 70; isDot = 0; break;
2825 case Intrinsic::ppc_altivec_vcmpequw: CompareOpc = 134; isDot = 0; break;
2826 case Intrinsic::ppc_altivec_vcmpgefp: CompareOpc = 454; isDot = 0; break;
2827 case Intrinsic::ppc_altivec_vcmpgtfp: CompareOpc = 710; isDot = 0; break;
2828 case Intrinsic::ppc_altivec_vcmpgtsb: CompareOpc = 774; isDot = 0; break;
2829 case Intrinsic::ppc_altivec_vcmpgtsh: CompareOpc = 838; isDot = 0; break;
2830 case Intrinsic::ppc_altivec_vcmpgtsw: CompareOpc = 902; isDot = 0; break;
2831 case Intrinsic::ppc_altivec_vcmpgtub: CompareOpc = 518; isDot = 0; break;
2832 case Intrinsic::ppc_altivec_vcmpgtuh: CompareOpc = 582; isDot = 0; break;
2833 case Intrinsic::ppc_altivec_vcmpgtuw: CompareOpc = 646; isDot = 0; break;
2838 /// LowerINTRINSIC_WO_CHAIN - If this is an intrinsic that we want to custom
2839 /// lower, do it, otherwise return null.
2840 static SDOperand LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG) {
2841 // If this is a lowered altivec predicate compare, CompareOpc is set to the
2842 // opcode number of the comparison.
2845 if (!getAltivecCompareInfo(Op, CompareOpc, isDot))
2846 return SDOperand(); // Don't custom lower most intrinsics.
2848 // If this is a non-dot comparison, make the VCMP node and we are done.
2850 SDOperand Tmp = DAG.getNode(PPCISD::VCMP, Op.getOperand(2).getValueType(),
2851 Op.getOperand(1), Op.getOperand(2),
2852 DAG.getConstant(CompareOpc, MVT::i32));
2853 return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Tmp);
2856 // Create the PPCISD altivec 'dot' comparison node.
2858 Op.getOperand(2), // LHS
2859 Op.getOperand(3), // RHS
2860 DAG.getConstant(CompareOpc, MVT::i32)
2862 std::vector<MVT::ValueType> VTs;
2863 VTs.push_back(Op.getOperand(2).getValueType());
2864 VTs.push_back(MVT::Flag);
2865 SDOperand CompNode = DAG.getNode(PPCISD::VCMPo, VTs, Ops, 3);
2867 // Now that we have the comparison, emit a copy from the CR to a GPR.
2868 // This is flagged to the above dot comparison.
2869 SDOperand Flags = DAG.getNode(PPCISD::MFCR, MVT::i32,
2870 DAG.getRegister(PPC::CR6, MVT::i32),
2871 CompNode.getValue(1));
2873 // Unpack the result based on how the target uses it.
2874 unsigned BitNo; // Bit # of CR6.
2875 bool InvertBit; // Invert result?
2876 switch (cast<ConstantSDNode>(Op.getOperand(1))->getValue()) {
2877 default: // Can't happen, don't crash on invalid number though.
2878 case 0: // Return the value of the EQ bit of CR6.
2879 BitNo = 0; InvertBit = false;
2881 case 1: // Return the inverted value of the EQ bit of CR6.
2882 BitNo = 0; InvertBit = true;
2884 case 2: // Return the value of the LT bit of CR6.
2885 BitNo = 2; InvertBit = false;
2887 case 3: // Return the inverted value of the LT bit of CR6.
2888 BitNo = 2; InvertBit = true;
2892 // Shift the bit into the low position.
2893 Flags = DAG.getNode(ISD::SRL, MVT::i32, Flags,
2894 DAG.getConstant(8-(3-BitNo), MVT::i32));
2896 Flags = DAG.getNode(ISD::AND, MVT::i32, Flags,
2897 DAG.getConstant(1, MVT::i32));
2899 // If we are supposed to, toggle the bit.
2901 Flags = DAG.getNode(ISD::XOR, MVT::i32, Flags,
2902 DAG.getConstant(1, MVT::i32));
2906 static SDOperand LowerSCALAR_TO_VECTOR(SDOperand Op, SelectionDAG &DAG) {
2907 // Create a stack slot that is 16-byte aligned.
2908 MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
2909 int FrameIdx = FrameInfo->CreateStackObject(16, 16);
2910 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
2911 SDOperand FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
2913 // Store the input value into Value#0 of the stack slot.
2914 SDOperand Store = DAG.getStore(DAG.getEntryNode(),
2915 Op.getOperand(0), FIdx, NULL, 0);
2917 return DAG.getLoad(Op.getValueType(), Store, FIdx, NULL, 0);
2920 static SDOperand LowerMUL(SDOperand Op, SelectionDAG &DAG) {
2921 if (Op.getValueType() == MVT::v4i32) {
2922 SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
2924 SDOperand Zero = BuildSplatI( 0, 1, MVT::v4i32, DAG);
2925 SDOperand Neg16 = BuildSplatI(-16, 4, MVT::v4i32, DAG); // +16 as shift amt.
2927 SDOperand RHSSwap = // = vrlw RHS, 16
2928 BuildIntrinsicOp(Intrinsic::ppc_altivec_vrlw, RHS, Neg16, DAG);
2930 // Shrinkify inputs to v8i16.
2931 LHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, LHS);
2932 RHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, RHS);
2933 RHSSwap = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, RHSSwap);
2935 // Low parts multiplied together, generating 32-bit results (we ignore the
2937 SDOperand LoProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmulouh,
2938 LHS, RHS, DAG, MVT::v4i32);
2940 SDOperand HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmsumuhm,
2941 LHS, RHSSwap, Zero, DAG, MVT::v4i32);
2942 // Shift the high parts up 16 bits.
2943 HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, HiProd, Neg16, DAG);
2944 return DAG.getNode(ISD::ADD, MVT::v4i32, LoProd, HiProd);
2945 } else if (Op.getValueType() == MVT::v8i16) {
2946 SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
2948 SDOperand Zero = BuildSplatI(0, 1, MVT::v8i16, DAG);
2950 return BuildIntrinsicOp(Intrinsic::ppc_altivec_vmladduhm,
2951 LHS, RHS, Zero, DAG);
2952 } else if (Op.getValueType() == MVT::v16i8) {
2953 SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
2955 // Multiply the even 8-bit parts, producing 16-bit sums.
2956 SDOperand EvenParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuleub,
2957 LHS, RHS, DAG, MVT::v8i16);
2958 EvenParts = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, EvenParts);
2960 // Multiply the odd 8-bit parts, producing 16-bit sums.
2961 SDOperand OddParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuloub,
2962 LHS, RHS, DAG, MVT::v8i16);
2963 OddParts = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, OddParts);
2965 // Merge the results together.
2967 for (unsigned i = 0; i != 8; ++i) {
2968 Ops[i*2 ] = DAG.getConstant(2*i+1, MVT::i8);
2969 Ops[i*2+1] = DAG.getConstant(2*i+1+16, MVT::i8);
2971 return DAG.getNode(ISD::VECTOR_SHUFFLE, MVT::v16i8, EvenParts, OddParts,
2972 DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops, 16));
2974 assert(0 && "Unknown mul to lower!");
2979 /// LowerOperation - Provide custom lowering hooks for some operations.
2981 SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
2982 switch (Op.getOpcode()) {
2983 default: assert(0 && "Wasn't expecting to be able to lower this!");
2984 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
2985 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
2986 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
2987 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
2988 case ISD::SETCC: return LowerSETCC(Op, DAG);
2990 return LowerVASTART(Op, DAG, VarArgsFrameIndex, VarArgsStackOffset,
2991 VarArgsNumGPR, VarArgsNumFPR, PPCSubTarget);
2994 return LowerVAARG(Op, DAG, VarArgsFrameIndex, VarArgsStackOffset,
2995 VarArgsNumGPR, VarArgsNumFPR, PPCSubTarget);
2997 case ISD::FORMAL_ARGUMENTS:
2998 return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex,
2999 VarArgsStackOffset, VarArgsNumGPR,
3000 VarArgsNumFPR, PPCSubTarget);
3002 case ISD::CALL: return LowerCALL(Op, DAG, PPCSubTarget);
3003 case ISD::RET: return LowerRET(Op, DAG, getTargetMachine());
3004 case ISD::STACKRESTORE: return LowerSTACKRESTORE(Op, DAG, PPCSubTarget);
3005 case ISD::DYNAMIC_STACKALLOC:
3006 return LowerDYNAMIC_STACKALLOC(Op, DAG, PPCSubTarget);
3008 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
3009 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
3010 case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
3011 case ISD::FP_ROUND_INREG: return LowerFP_ROUND_INREG(Op, DAG);
3013 // Lower 64-bit shifts.
3014 case ISD::SHL_PARTS: return LowerSHL_PARTS(Op, DAG);
3015 case ISD::SRL_PARTS: return LowerSRL_PARTS(Op, DAG);
3016 case ISD::SRA_PARTS: return LowerSRA_PARTS(Op, DAG);
3018 // Vector-related lowering.
3019 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
3020 case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
3021 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
3022 case ISD::SCALAR_TO_VECTOR: return LowerSCALAR_TO_VECTOR(Op, DAG);
3023 case ISD::MUL: return LowerMUL(Op, DAG);
3025 // Frame & Return address. Currently unimplemented
3026 case ISD::RETURNADDR: break;
3027 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
3032 //===----------------------------------------------------------------------===//
3033 // Other Lowering Code
3034 //===----------------------------------------------------------------------===//
3037 PPCTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
3038 MachineBasicBlock *BB) {
3039 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3040 assert((MI->getOpcode() == PPC::SELECT_CC_I4 ||
3041 MI->getOpcode() == PPC::SELECT_CC_I8 ||
3042 MI->getOpcode() == PPC::SELECT_CC_F4 ||
3043 MI->getOpcode() == PPC::SELECT_CC_F8 ||
3044 MI->getOpcode() == PPC::SELECT_CC_VRRC) &&
3045 "Unexpected instr type to insert");
3047 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
3048 // control-flow pattern. The incoming instruction knows the destination vreg
3049 // to set, the condition code register to branch on, the true/false values to
3050 // select between, and a branch opcode to use.
3051 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3052 ilist<MachineBasicBlock>::iterator It = BB;
3058 // cmpTY ccX, r1, r2
3060 // fallthrough --> copy0MBB
3061 MachineBasicBlock *thisMBB = BB;
3062 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
3063 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
3064 unsigned SelectPred = MI->getOperand(4).getImm();
3065 BuildMI(BB, TII->get(PPC::BCC))
3066 .addImm(SelectPred).addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
3067 MachineFunction *F = BB->getParent();
3068 F->getBasicBlockList().insert(It, copy0MBB);
3069 F->getBasicBlockList().insert(It, sinkMBB);
3070 // Update machine-CFG edges by first adding all successors of the current
3071 // block to the new block which will contain the Phi node for the select.
3072 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
3073 e = BB->succ_end(); i != e; ++i)
3074 sinkMBB->addSuccessor(*i);
3075 // Next, remove all successors of the current block, and add the true
3076 // and fallthrough blocks as its successors.
3077 while(!BB->succ_empty())
3078 BB->removeSuccessor(BB->succ_begin());
3079 BB->addSuccessor(copy0MBB);
3080 BB->addSuccessor(sinkMBB);
3083 // %FalseValue = ...
3084 // # fallthrough to sinkMBB
3087 // Update machine-CFG edges
3088 BB->addSuccessor(sinkMBB);
3091 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
3094 BuildMI(BB, TII->get(PPC::PHI), MI->getOperand(0).getReg())
3095 .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
3096 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
3098 delete MI; // The pseudo instruction is gone now.
3102 //===----------------------------------------------------------------------===//
3103 // Target Optimization Hooks
3104 //===----------------------------------------------------------------------===//
3106 SDOperand PPCTargetLowering::PerformDAGCombine(SDNode *N,
3107 DAGCombinerInfo &DCI) const {
3108 TargetMachine &TM = getTargetMachine();
3109 SelectionDAG &DAG = DCI.DAG;
3110 switch (N->getOpcode()) {
3113 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
3114 if (C->getValue() == 0) // 0 << V -> 0.
3115 return N->getOperand(0);
3119 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
3120 if (C->getValue() == 0) // 0 >>u V -> 0.
3121 return N->getOperand(0);
3125 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
3126 if (C->getValue() == 0 || // 0 >>s V -> 0.
3127 C->isAllOnesValue()) // -1 >>s V -> -1.
3128 return N->getOperand(0);
3132 case ISD::SINT_TO_FP:
3133 if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
3134 if (N->getOperand(0).getOpcode() == ISD::FP_TO_SINT) {
3135 // Turn (sint_to_fp (fp_to_sint X)) -> fctidz/fcfid without load/stores.
3136 // We allow the src/dst to be either f32/f64, but the intermediate
3137 // type must be i64.
3138 if (N->getOperand(0).getValueType() == MVT::i64) {
3139 SDOperand Val = N->getOperand(0).getOperand(0);
3140 if (Val.getValueType() == MVT::f32) {
3141 Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
3142 DCI.AddToWorklist(Val.Val);
3145 Val = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Val);
3146 DCI.AddToWorklist(Val.Val);
3147 Val = DAG.getNode(PPCISD::FCFID, MVT::f64, Val);
3148 DCI.AddToWorklist(Val.Val);
3149 if (N->getValueType(0) == MVT::f32) {
3150 Val = DAG.getNode(ISD::FP_ROUND, MVT::f32, Val);
3151 DCI.AddToWorklist(Val.Val);
3154 } else if (N->getOperand(0).getValueType() == MVT::i32) {
3155 // If the intermediate type is i32, we can avoid the load/store here
3162 // Turn STORE (FP_TO_SINT F) -> STFIWX(FCTIWZ(F)).
3163 if (TM.getSubtarget<PPCSubtarget>().hasSTFIWX() &&
3164 N->getOperand(1).getOpcode() == ISD::FP_TO_SINT &&
3165 N->getOperand(1).getValueType() == MVT::i32) {
3166 SDOperand Val = N->getOperand(1).getOperand(0);
3167 if (Val.getValueType() == MVT::f32) {
3168 Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
3169 DCI.AddToWorklist(Val.Val);
3171 Val = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Val);
3172 DCI.AddToWorklist(Val.Val);
3174 Val = DAG.getNode(PPCISD::STFIWX, MVT::Other, N->getOperand(0), Val,
3175 N->getOperand(2), N->getOperand(3));
3176 DCI.AddToWorklist(Val.Val);
3180 // Turn STORE (BSWAP) -> sthbrx/stwbrx.
3181 if (N->getOperand(1).getOpcode() == ISD::BSWAP &&
3182 N->getOperand(1).Val->hasOneUse() &&
3183 (N->getOperand(1).getValueType() == MVT::i32 ||
3184 N->getOperand(1).getValueType() == MVT::i16)) {
3185 SDOperand BSwapOp = N->getOperand(1).getOperand(0);
3186 // Do an any-extend to 32-bits if this is a half-word input.
3187 if (BSwapOp.getValueType() == MVT::i16)
3188 BSwapOp = DAG.getNode(ISD::ANY_EXTEND, MVT::i32, BSwapOp);
3190 return DAG.getNode(PPCISD::STBRX, MVT::Other, N->getOperand(0), BSwapOp,
3191 N->getOperand(2), N->getOperand(3),
3192 DAG.getValueType(N->getOperand(1).getValueType()));
3196 // Turn BSWAP (LOAD) -> lhbrx/lwbrx.
3197 if (ISD::isNON_EXTLoad(N->getOperand(0).Val) &&
3198 N->getOperand(0).hasOneUse() &&
3199 (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i16)) {
3200 SDOperand Load = N->getOperand(0);
3201 LoadSDNode *LD = cast<LoadSDNode>(Load);
3202 // Create the byte-swapping load.
3203 std::vector<MVT::ValueType> VTs;
3204 VTs.push_back(MVT::i32);
3205 VTs.push_back(MVT::Other);
3206 SDOperand SV = DAG.getSrcValue(LD->getSrcValue(), LD->getSrcValueOffset());
3208 LD->getChain(), // Chain
3209 LD->getBasePtr(), // Ptr
3211 DAG.getValueType(N->getValueType(0)) // VT
3213 SDOperand BSLoad = DAG.getNode(PPCISD::LBRX, VTs, Ops, 4);
3215 // If this is an i16 load, insert the truncate.
3216 SDOperand ResVal = BSLoad;
3217 if (N->getValueType(0) == MVT::i16)
3218 ResVal = DAG.getNode(ISD::TRUNCATE, MVT::i16, BSLoad);
3220 // First, combine the bswap away. This makes the value produced by the
3222 DCI.CombineTo(N, ResVal);
3224 // Next, combine the load away, we give it a bogus result value but a real
3225 // chain result. The result value is dead because the bswap is dead.
3226 DCI.CombineTo(Load.Val, ResVal, BSLoad.getValue(1));
3228 // Return N so it doesn't get rechecked!
3229 return SDOperand(N, 0);
3233 case PPCISD::VCMP: {
3234 // If a VCMPo node already exists with exactly the same operands as this
3235 // node, use its result instead of this node (VCMPo computes both a CR6 and
3236 // a normal output).
3238 if (!N->getOperand(0).hasOneUse() &&
3239 !N->getOperand(1).hasOneUse() &&
3240 !N->getOperand(2).hasOneUse()) {
3242 // Scan all of the users of the LHS, looking for VCMPo's that match.
3243 SDNode *VCMPoNode = 0;
3245 SDNode *LHSN = N->getOperand(0).Val;
3246 for (SDNode::use_iterator UI = LHSN->use_begin(), E = LHSN->use_end();
3248 if ((*UI)->getOpcode() == PPCISD::VCMPo &&
3249 (*UI)->getOperand(1) == N->getOperand(1) &&
3250 (*UI)->getOperand(2) == N->getOperand(2) &&
3251 (*UI)->getOperand(0) == N->getOperand(0)) {
3256 // If there is no VCMPo node, or if the flag value has a single use, don't
3258 if (!VCMPoNode || VCMPoNode->hasNUsesOfValue(0, 1))
3261 // Look at the (necessarily single) use of the flag value. If it has a
3262 // chain, this transformation is more complex. Note that multiple things
3263 // could use the value result, which we should ignore.
3264 SDNode *FlagUser = 0;
3265 for (SDNode::use_iterator UI = VCMPoNode->use_begin();
3266 FlagUser == 0; ++UI) {
3267 assert(UI != VCMPoNode->use_end() && "Didn't find user!");
3269 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
3270 if (User->getOperand(i) == SDOperand(VCMPoNode, 1)) {
3277 // If the user is a MFCR instruction, we know this is safe. Otherwise we
3278 // give up for right now.
3279 if (FlagUser->getOpcode() == PPCISD::MFCR)
3280 return SDOperand(VCMPoNode, 0);
3285 // If this is a branch on an altivec predicate comparison, lower this so
3286 // that we don't have to do a MFCR: instead, branch directly on CR6. This
3287 // lowering is done pre-legalize, because the legalizer lowers the predicate
3288 // compare down to code that is difficult to reassemble.
3289 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
3290 SDOperand LHS = N->getOperand(2), RHS = N->getOperand(3);
3294 if (LHS.getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
3295 isa<ConstantSDNode>(RHS) && (CC == ISD::SETEQ || CC == ISD::SETNE) &&
3296 getAltivecCompareInfo(LHS, CompareOpc, isDot)) {
3297 assert(isDot && "Can't compare against a vector result!");
3299 // If this is a comparison against something other than 0/1, then we know
3300 // that the condition is never/always true.
3301 unsigned Val = cast<ConstantSDNode>(RHS)->getValue();
3302 if (Val != 0 && Val != 1) {
3303 if (CC == ISD::SETEQ) // Cond never true, remove branch.
3304 return N->getOperand(0);
3305 // Always !=, turn it into an unconditional branch.
3306 return DAG.getNode(ISD::BR, MVT::Other,
3307 N->getOperand(0), N->getOperand(4));
3310 bool BranchOnWhenPredTrue = (CC == ISD::SETEQ) ^ (Val == 0);
3312 // Create the PPCISD altivec 'dot' comparison node.
3313 std::vector<MVT::ValueType> VTs;
3315 LHS.getOperand(2), // LHS of compare
3316 LHS.getOperand(3), // RHS of compare
3317 DAG.getConstant(CompareOpc, MVT::i32)
3319 VTs.push_back(LHS.getOperand(2).getValueType());
3320 VTs.push_back(MVT::Flag);
3321 SDOperand CompNode = DAG.getNode(PPCISD::VCMPo, VTs, Ops, 3);
3323 // Unpack the result based on how the target uses it.
3324 PPC::Predicate CompOpc;
3325 switch (cast<ConstantSDNode>(LHS.getOperand(1))->getValue()) {
3326 default: // Can't happen, don't crash on invalid number though.
3327 case 0: // Branch on the value of the EQ bit of CR6.
3328 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_EQ : PPC::PRED_NE;
3330 case 1: // Branch on the inverted value of the EQ bit of CR6.
3331 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_NE : PPC::PRED_EQ;
3333 case 2: // Branch on the value of the LT bit of CR6.
3334 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_LT : PPC::PRED_GE;
3336 case 3: // Branch on the inverted value of the LT bit of CR6.
3337 CompOpc = BranchOnWhenPredTrue ? PPC::PRED_GE : PPC::PRED_LT;
3341 return DAG.getNode(PPCISD::COND_BRANCH, MVT::Other, N->getOperand(0),
3342 DAG.getConstant(CompOpc, MVT::i32),
3343 DAG.getRegister(PPC::CR6, MVT::i32),
3344 N->getOperand(4), CompNode.getValue(1));
3353 //===----------------------------------------------------------------------===//
3354 // Inline Assembly Support
3355 //===----------------------------------------------------------------------===//
3357 void PPCTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
3359 uint64_t &KnownZero,
3361 const SelectionDAG &DAG,
3362 unsigned Depth) const {
3365 switch (Op.getOpcode()) {
3367 case PPCISD::LBRX: {
3368 // lhbrx is known to have the top bits cleared out.
3369 if (cast<VTSDNode>(Op.getOperand(3))->getVT() == MVT::i16)
3370 KnownZero = 0xFFFF0000;
3373 case ISD::INTRINSIC_WO_CHAIN: {
3374 switch (cast<ConstantSDNode>(Op.getOperand(0))->getValue()) {
3376 case Intrinsic::ppc_altivec_vcmpbfp_p:
3377 case Intrinsic::ppc_altivec_vcmpeqfp_p:
3378 case Intrinsic::ppc_altivec_vcmpequb_p:
3379 case Intrinsic::ppc_altivec_vcmpequh_p:
3380 case Intrinsic::ppc_altivec_vcmpequw_p:
3381 case Intrinsic::ppc_altivec_vcmpgefp_p:
3382 case Intrinsic::ppc_altivec_vcmpgtfp_p:
3383 case Intrinsic::ppc_altivec_vcmpgtsb_p:
3384 case Intrinsic::ppc_altivec_vcmpgtsh_p:
3385 case Intrinsic::ppc_altivec_vcmpgtsw_p:
3386 case Intrinsic::ppc_altivec_vcmpgtub_p:
3387 case Intrinsic::ppc_altivec_vcmpgtuh_p:
3388 case Intrinsic::ppc_altivec_vcmpgtuw_p:
3389 KnownZero = ~1U; // All bits but the low one are known to be zero.
3397 /// getConstraintType - Given a constraint, return the type of
3398 /// constraint it is for this target.
3399 PPCTargetLowering::ConstraintType
3400 PPCTargetLowering::getConstraintType(const std::string &Constraint) const {
3401 if (Constraint.size() == 1) {
3402 switch (Constraint[0]) {
3409 return C_RegisterClass;
3412 return TargetLowering::getConstraintType(Constraint);
3415 std::pair<unsigned, const TargetRegisterClass*>
3416 PPCTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
3417 MVT::ValueType VT) const {
3418 if (Constraint.size() == 1) {
3419 // GCC RS6000 Constraint Letters
3420 switch (Constraint[0]) {
3423 if (VT == MVT::i64 && PPCSubTarget.isPPC64())
3424 return std::make_pair(0U, PPC::G8RCRegisterClass);
3425 return std::make_pair(0U, PPC::GPRCRegisterClass);
3428 return std::make_pair(0U, PPC::F4RCRegisterClass);
3429 else if (VT == MVT::f64)
3430 return std::make_pair(0U, PPC::F8RCRegisterClass);
3433 return std::make_pair(0U, PPC::VRRCRegisterClass);
3435 return std::make_pair(0U, PPC::CRRCRegisterClass);
3439 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
3443 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
3444 /// vector. If it is invalid, don't add anything to Ops.
3445 void PPCTargetLowering::LowerAsmOperandForConstraint(SDOperand Op, char Letter,
3446 std::vector<SDOperand>&Ops,
3447 SelectionDAG &DAG) {
3448 SDOperand Result(0,0);
3459 ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op);
3460 if (!CST) return; // Must be an immediate to match.
3461 unsigned Value = CST->getValue();
3463 default: assert(0 && "Unknown constraint letter!");
3464 case 'I': // "I" is a signed 16-bit constant.
3465 if ((short)Value == (int)Value)
3466 Result = DAG.getTargetConstant(Value, Op.getValueType());
3468 case 'J': // "J" is a constant with only the high-order 16 bits nonzero.
3469 case 'L': // "L" is a signed 16-bit constant shifted left 16 bits.
3470 if ((short)Value == 0)
3471 Result = DAG.getTargetConstant(Value, Op.getValueType());
3473 case 'K': // "K" is a constant with only the low-order 16 bits nonzero.
3474 if ((Value >> 16) == 0)
3475 Result = DAG.getTargetConstant(Value, Op.getValueType());
3477 case 'M': // "M" is a constant that is greater than 31.
3479 Result = DAG.getTargetConstant(Value, Op.getValueType());
3481 case 'N': // "N" is a positive constant that is an exact power of two.
3482 if ((int)Value > 0 && isPowerOf2_32(Value))
3483 Result = DAG.getTargetConstant(Value, Op.getValueType());
3485 case 'O': // "O" is the constant zero.
3487 Result = DAG.getTargetConstant(Value, Op.getValueType());
3489 case 'P': // "P" is a constant whose negation is a signed 16-bit constant.
3490 if ((short)-Value == (int)-Value)
3491 Result = DAG.getTargetConstant(Value, Op.getValueType());
3499 Ops.push_back(Result);
3503 // Handle standard constraint letters.
3504 TargetLowering::LowerAsmOperandForConstraint(Op, Letter, Ops, DAG);
3507 // isLegalAddressingMode - Return true if the addressing mode represented
3508 // by AM is legal for this target, for a load/store of the specified type.
3509 bool PPCTargetLowering::isLegalAddressingMode(const AddrMode &AM,
3510 const Type *Ty) const {
3511 // FIXME: PPC does not allow r+i addressing modes for vectors!
3513 // PPC allows a sign-extended 16-bit immediate field.
3514 if (AM.BaseOffs <= -(1LL << 16) || AM.BaseOffs >= (1LL << 16)-1)
3517 // No global is ever allowed as a base.
3521 // PPC only support r+r,
3523 case 0: // "r+i" or just "i", depending on HasBaseReg.
3526 if (AM.HasBaseReg && AM.BaseOffs) // "r+r+i" is not allowed.
3528 // Otherwise we have r+r or r+i.
3531 if (AM.HasBaseReg || AM.BaseOffs) // 2*r+r or 2*r+i is not allowed.
3533 // Allow 2*r as r+r.
3536 // No other scales are supported.
3543 /// isLegalAddressImmediate - Return true if the integer value can be used
3544 /// as the offset of the target addressing mode for load / store of the
3546 bool PPCTargetLowering::isLegalAddressImmediate(int64_t V,const Type *Ty) const{
3547 // PPC allows a sign-extended 16-bit immediate field.
3548 return (V > -(1 << 16) && V < (1 << 16)-1);
3551 bool PPCTargetLowering::isLegalAddressImmediate(llvm::GlobalValue* GV) const {
3555 SDOperand PPCTargetLowering::LowerFRAMEADDR(SDOperand Op, SelectionDAG &DAG)
3557 // Depths > 0 not supported yet!
3558 if (cast<ConstantSDNode>(Op.getOperand(0))->getValue() > 0)
3561 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
3562 bool isPPC64 = PtrVT == MVT::i64;
3564 MachineFunction &MF = DAG.getMachineFunction();
3565 MachineFrameInfo *MFI = MF.getFrameInfo();
3566 bool is31 = (NoFramePointerElim || MFI->hasVarSizedObjects())
3567 && MFI->getStackSize();
3570 return DAG.getCopyFromReg(DAG.getEntryNode(), is31 ? PPC::X31 : PPC::X1,
3573 return DAG.getCopyFromReg(DAG.getEntryNode(), is31 ? PPC::R31 : PPC::R1,