1 //===-- IA64ISelLowering.cpp - IA64 DAG Lowering Implementation -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Duraid Madina and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the IA64ISelLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "IA64ISelLowering.h"
15 #include "IA64MachineFunctionInfo.h"
16 #include "IA64TargetMachine.h"
17 #include "llvm/CodeGen/MachineFrameInfo.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
21 #include "llvm/CodeGen/SSARegMap.h"
22 #include "llvm/Constants.h"
23 #include "llvm/Function.h"
26 IA64TargetLowering::IA64TargetLowering(TargetMachine &TM)
27 : TargetLowering(TM) {
29 // register class for general registers
30 addRegisterClass(MVT::i64, IA64::GRRegisterClass);
32 // register class for FP registers
33 addRegisterClass(MVT::f64, IA64::FPRegisterClass);
35 // register class for predicate registers
36 addRegisterClass(MVT::i1, IA64::PRRegisterClass);
38 setLoadXAction(ISD::EXTLOAD , MVT::i1 , Promote);
40 setLoadXAction(ISD::ZEXTLOAD , MVT::i1 , Expand);
42 setLoadXAction(ISD::SEXTLOAD , MVT::i1 , Expand);
43 setLoadXAction(ISD::SEXTLOAD , MVT::i8 , Expand);
44 setLoadXAction(ISD::SEXTLOAD , MVT::i16 , Expand);
45 setLoadXAction(ISD::SEXTLOAD , MVT::i32 , Expand);
47 setOperationAction(ISD::BRIND , MVT::i64, Expand);
48 setOperationAction(ISD::BR_CC , MVT::Other, Expand);
49 setOperationAction(ISD::FP_ROUND_INREG , MVT::f32 , Expand);
51 // ia64 uses SELECT not SELECT_CC
52 setOperationAction(ISD::SELECT_CC , MVT::Other, Expand);
54 // We need to handle ISD::RET for void functions ourselves,
55 // so we get a chance to restore ar.pfs before adding a
57 setOperationAction(ISD::RET, MVT::Other, Custom);
59 setSetCCResultType(MVT::i1);
60 setShiftAmountType(MVT::i64);
62 setOperationAction(ISD::FREM , MVT::f32 , Expand);
63 setOperationAction(ISD::FREM , MVT::f64 , Expand);
65 setOperationAction(ISD::UREM , MVT::f32 , Expand);
66 setOperationAction(ISD::UREM , MVT::f64 , Expand);
68 setOperationAction(ISD::MEMMOVE , MVT::Other, Expand);
69 setOperationAction(ISD::MEMSET , MVT::Other, Expand);
70 setOperationAction(ISD::MEMCPY , MVT::Other, Expand);
72 setOperationAction(ISD::SINT_TO_FP , MVT::i1 , Promote);
73 setOperationAction(ISD::UINT_TO_FP , MVT::i1 , Promote);
75 // We don't support sin/cos/sqrt
76 setOperationAction(ISD::FSIN , MVT::f64, Expand);
77 setOperationAction(ISD::FCOS , MVT::f64, Expand);
78 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
79 setOperationAction(ISD::FSIN , MVT::f32, Expand);
80 setOperationAction(ISD::FCOS , MVT::f32, Expand);
81 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
83 // FIXME: IA64 supports fcopysign natively!
84 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
85 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
87 // We don't have line number support yet.
88 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
89 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
90 setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand);
92 //IA64 has these, but they are not implemented
93 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
94 setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
95 setOperationAction(ISD::ROTL , MVT::i64 , Expand);
96 setOperationAction(ISD::ROTR , MVT::i64 , Expand);
97 setOperationAction(ISD::BSWAP, MVT::i64 , Expand); // mux @rev
99 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
100 setOperationAction(ISD::VAARG , MVT::Other, Custom);
101 setOperationAction(ISD::VASTART , MVT::Other, Custom);
103 // Use the default implementation.
104 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
105 setOperationAction(ISD::VAEND , MVT::Other, Expand);
106 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
107 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
108 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
110 setStackPointerRegisterToSaveRestore(IA64::r12);
112 setJumpBufSize(704); // on ia64-linux, jmp_bufs are 704 bytes..
113 setJumpBufAlignment(16); // ...and must be 16-byte aligned
115 computeRegisterProperties();
117 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
118 addLegalFPImmediate(+0.0);
119 addLegalFPImmediate(+1.0);
122 const char *IA64TargetLowering::getTargetNodeName(unsigned Opcode) const {
125 case IA64ISD::GETFD: return "IA64ISD::GETFD";
126 case IA64ISD::BRCALL: return "IA64ISD::BRCALL";
127 case IA64ISD::RET_FLAG: return "IA64ISD::RET_FLAG";
132 /// isFloatingPointZero - Return true if this is 0.0 or -0.0.
133 static bool isFloatingPointZero(SDOperand Op) {
134 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
135 return CFP->isExactlyValue(-0.0) || CFP->isExactlyValue(0.0);
136 else if (Op.getOpcode() == ISD::EXTLOAD || Op.getOpcode() == ISD::LOAD) {
137 // Maybe this has already been legalized into the constant pool?
138 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
139 if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
140 return CFP->isExactlyValue(-0.0) || CFP->isExactlyValue(0.0);
145 std::vector<SDOperand>
146 IA64TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
147 std::vector<SDOperand> ArgValues;
149 // add beautiful description of IA64 stack frame format
150 // here (from intel 24535803.pdf most likely)
152 MachineFunction &MF = DAG.getMachineFunction();
153 MachineFrameInfo *MFI = MF.getFrameInfo();
155 GP = MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
156 SP = MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
157 RP = MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
159 MachineBasicBlock& BB = MF.front();
161 unsigned args_int[] = {IA64::r32, IA64::r33, IA64::r34, IA64::r35,
162 IA64::r36, IA64::r37, IA64::r38, IA64::r39};
164 unsigned args_FP[] = {IA64::F8, IA64::F9, IA64::F10, IA64::F11,
165 IA64::F12,IA64::F13,IA64::F14, IA64::F15};
171 unsigned used_FPArgs = 0; // how many FP args have been used so far?
173 unsigned ArgOffset = 0;
176 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
178 SDOperand newroot, argt;
179 if(count < 8) { // need to fix this logic? maybe.
181 switch (getValueType(I->getType())) {
183 assert(0 && "ERROR in LowerArgs: can't lower this type of arg.\n");
185 // fixme? (well, will need to for weird FP structy stuff,
186 // see intel ABI docs)
188 //XXX BuildMI(&BB, IA64::IDEF, 0, args_FP[used_FPArgs]);
189 MF.addLiveIn(args_FP[used_FPArgs]); // mark this reg as liveIn
190 // floating point args go into f8..f15 as-needed, the increment
191 argVreg[count] = // is below..:
192 MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::f64));
193 // FP args go into f8..f15 as needed: (hence the ++)
194 argPreg[count] = args_FP[used_FPArgs++];
195 argOpc[count] = IA64::FMOV;
196 argt = newroot = DAG.getCopyFromReg(DAG.getRoot(), argVreg[count],
198 if (I->getType() == Type::FloatTy)
199 argt = DAG.getNode(ISD::FP_ROUND, MVT::f32, argt);
201 case MVT::i1: // NOTE: as far as C abi stuff goes,
202 // bools are just boring old ints
207 //XXX BuildMI(&BB, IA64::IDEF, 0, args_int[count]);
208 MF.addLiveIn(args_int[count]); // mark this register as liveIn
210 MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
211 argPreg[count] = args_int[count];
212 argOpc[count] = IA64::MOV;
214 DAG.getCopyFromReg(DAG.getRoot(), argVreg[count], MVT::i64);
215 if ( getValueType(I->getType()) != MVT::i64)
216 argt = DAG.getNode(ISD::TRUNCATE, getValueType(I->getType()),
220 } else { // more than 8 args go into the frame
221 // Create the frame index object for this incoming parameter...
222 ArgOffset = 16 + 8 * (count - 8);
223 int FI = MFI->CreateFixedObject(8, ArgOffset);
225 // Create the SelectionDAG nodes corresponding to a load
226 //from this parameter
227 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i64);
228 argt = newroot = DAG.getLoad(getValueType(I->getType()),
229 DAG.getEntryNode(), FIN, DAG.getSrcValue(NULL));
232 DAG.setRoot(newroot.getValue(1));
233 ArgValues.push_back(argt);
237 // Create a vreg to hold the output of (what will become)
238 // the "alloc" instruction
239 VirtGPR = MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
240 BuildMI(&BB, IA64::PSEUDO_ALLOC, 0, VirtGPR);
241 // we create a PSEUDO_ALLOC (pseudo)instruction for now
243 BuildMI(&BB, IA64::IDEF, 0, IA64::r1);
246 BuildMI(&BB, IA64::IDEF, 0, IA64::r12);
247 BuildMI(&BB, IA64::IDEF, 0, IA64::rp);
250 BuildMI(&BB, IA64::MOV, 1, GP).addReg(IA64::r1);
253 BuildMI(&BB, IA64::MOV, 1, SP).addReg(IA64::r12);
254 BuildMI(&BB, IA64::MOV, 1, RP).addReg(IA64::rp);
258 unsigned tempOffset=0;
260 // if this is a varargs function, we simply lower llvm.va_start by
261 // pointing to the first entry
264 VarArgsFrameIndex = MFI->CreateFixedObject(8, tempOffset);
267 // here we actually do the moving of args, and store them to the stack
268 // too if this is a varargs function:
269 for (int i = 0; i < count && i < 8; ++i) {
270 BuildMI(&BB, argOpc[i], 1, argVreg[i]).addReg(argPreg[i]);
272 // if this is a varargs function, we copy the input registers to the stack
273 int FI = MFI->CreateFixedObject(8, tempOffset);
274 tempOffset+=8; //XXX: is it safe to use r22 like this?
275 BuildMI(&BB, IA64::MOV, 1, IA64::r22).addFrameIndex(FI);
276 // FIXME: we should use st8.spill here, one day
277 BuildMI(&BB, IA64::ST8, 1, IA64::r22).addReg(argPreg[i]);
281 // Finally, inform the code generator which regs we return values in.
282 // (see the ISD::RET: case in the instruction selector)
283 switch (getValueType(F.getReturnType())) {
284 default: assert(0 && "i have no idea where to return this type!");
285 case MVT::isVoid: break;
291 MF.addLiveOut(IA64::r8);
295 MF.addLiveOut(IA64::F8);
302 std::pair<SDOperand, SDOperand>
303 IA64TargetLowering::LowerCallTo(SDOperand Chain,
304 const Type *RetTy, bool isVarArg,
305 unsigned CallingConv, bool isTailCall,
306 SDOperand Callee, ArgListTy &Args,
309 MachineFunction &MF = DAG.getMachineFunction();
311 unsigned NumBytes = 16;
312 unsigned outRegsUsed = 0;
314 if (Args.size() > 8) {
315 NumBytes += (Args.size() - 8) * 8;
318 outRegsUsed = Args.size();
321 // FIXME? this WILL fail if we ever try to pass around an arg that
322 // consumes more than a single output slot (a 'real' double, int128
323 // some sort of aggregate etc.), as we'll underestimate how many 'outX'
324 // registers we use. Hopefully, the assembler will notice.
325 MF.getInfo<IA64FunctionInfo>()->outRegsUsed=
326 std::max(outRegsUsed, MF.getInfo<IA64FunctionInfo>()->outRegsUsed);
328 // keep stack frame 16-byte aligned
329 //assert(NumBytes==((NumBytes+15) & ~15) && "stack frame not 16-byte aligned!");
330 NumBytes = (NumBytes+15) & ~15;
332 Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(NumBytes, getPointerTy()));
334 SDOperand StackPtr, NullSV;
335 std::vector<SDOperand> Stores;
336 std::vector<SDOperand> Converts;
337 std::vector<SDOperand> RegValuesToPass;
338 unsigned ArgOffset = 16;
340 for (unsigned i = 0, e = Args.size(); i != e; ++i)
342 SDOperand Val = Args[i].first;
343 MVT::ValueType ObjectVT = Val.getValueType();
344 SDOperand ValToStore(0, 0), ValToConvert(0, 0);
347 default: assert(0 && "unexpected argument type!");
352 //promote to 64-bits, sign/zero extending based on type
354 if(Args[i].second->isSigned())
355 Val = DAG.getNode(ISD::SIGN_EXTEND, MVT::i64, Val);
357 Val = DAG.getNode(ISD::ZERO_EXTEND, MVT::i64, Val);
361 if(RegValuesToPass.size() >= 8) {
364 RegValuesToPass.push_back(Val);
369 Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
372 if(RegValuesToPass.size() >= 8) {
375 RegValuesToPass.push_back(Val);
376 if(1 /* TODO: if(calling external or varadic function)*/ ) {
377 ValToConvert = Val; // additionally pass this FP value as an int
385 StackPtr = DAG.getRegister(IA64::r12, MVT::i64);
386 NullSV = DAG.getSrcValue(NULL);
388 SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
389 PtrOff = DAG.getNode(ISD::ADD, MVT::i64, StackPtr, PtrOff);
390 Stores.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
391 ValToStore, PtrOff, NullSV));
392 ArgOffset += ObjSize;
395 if(ValToConvert.Val) {
396 Converts.push_back(DAG.getNode(IA64ISD::GETFD, MVT::i64, ValToConvert));
400 // Emit all stores, make sure they occur before any copies into physregs.
402 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &Stores[0],Stores.size());
404 static const unsigned IntArgRegs[] = {
405 IA64::out0, IA64::out1, IA64::out2, IA64::out3,
406 IA64::out4, IA64::out5, IA64::out6, IA64::out7
409 static const unsigned FPArgRegs[] = {
410 IA64::F8, IA64::F9, IA64::F10, IA64::F11,
411 IA64::F12, IA64::F13, IA64::F14, IA64::F15
416 // save the current GP, SP and RP : FIXME: do we need to do all 3 always?
417 SDOperand GPBeforeCall = DAG.getCopyFromReg(Chain, IA64::r1, MVT::i64, InFlag);
418 Chain = GPBeforeCall.getValue(1);
419 InFlag = Chain.getValue(2);
420 SDOperand SPBeforeCall = DAG.getCopyFromReg(Chain, IA64::r12, MVT::i64, InFlag);
421 Chain = SPBeforeCall.getValue(1);
422 InFlag = Chain.getValue(2);
423 SDOperand RPBeforeCall = DAG.getCopyFromReg(Chain, IA64::rp, MVT::i64, InFlag);
424 Chain = RPBeforeCall.getValue(1);
425 InFlag = Chain.getValue(2);
427 // Build a sequence of copy-to-reg nodes chained together with token chain
428 // and flag operands which copy the outgoing integer args into regs out[0-7]
429 // mapped 1:1 and the FP args into regs F8-F15 "lazily"
430 // TODO: for performance, we should only copy FP args into int regs when we
431 // know this is required (i.e. for varardic or external (unknown) functions)
433 // first to the FP->(integer representation) conversions, these are
434 // flagged for now, but shouldn't have to be (TODO)
435 unsigned seenConverts = 0;
436 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
437 if(MVT::isFloatingPoint(RegValuesToPass[i].getValueType())) {
438 Chain = DAG.getCopyToReg(Chain, IntArgRegs[i], Converts[seenConverts++], InFlag);
439 InFlag = Chain.getValue(1);
443 // next copy args into the usual places, these are flagged
444 unsigned usedFPArgs = 0;
445 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
446 Chain = DAG.getCopyToReg(Chain,
447 MVT::isInteger(RegValuesToPass[i].getValueType()) ?
448 IntArgRegs[i] : FPArgRegs[usedFPArgs++],
449 RegValuesToPass[i], InFlag);
450 InFlag = Chain.getValue(1);
453 // If the callee is a GlobalAddress node (quite common, every direct call is)
454 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
456 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
457 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i64);
461 std::vector<MVT::ValueType> NodeTys;
462 std::vector<SDOperand> CallOperands;
463 NodeTys.push_back(MVT::Other); // Returns a chain
464 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
465 CallOperands.push_back(Chain);
466 CallOperands.push_back(Callee);
468 // emit the call itself
470 CallOperands.push_back(InFlag);
472 assert(0 && "this should never happen!\n");
474 // to make way for a hack:
475 Chain = DAG.getNode(IA64ISD::BRCALL, NodeTys,
476 &CallOperands[0], CallOperands.size());
477 InFlag = Chain.getValue(1);
479 // restore the GP, SP and RP after the call
480 Chain = DAG.getCopyToReg(Chain, IA64::r1, GPBeforeCall, InFlag);
481 InFlag = Chain.getValue(1);
482 Chain = DAG.getCopyToReg(Chain, IA64::r12, SPBeforeCall, InFlag);
483 InFlag = Chain.getValue(1);
484 Chain = DAG.getCopyToReg(Chain, IA64::rp, RPBeforeCall, InFlag);
485 InFlag = Chain.getValue(1);
487 std::vector<MVT::ValueType> RetVals;
488 RetVals.push_back(MVT::Other);
489 RetVals.push_back(MVT::Flag);
491 MVT::ValueType RetTyVT = getValueType(RetTy);
493 if (RetTyVT != MVT::isVoid) {
495 default: assert(0 && "Unknown value type to return!");
496 case MVT::i1: { // bools are just like other integers (returned in r8)
497 // we *could* fall through to the truncate below, but this saves a
498 // few redundant predicate ops
499 SDOperand boolInR8 = DAG.getCopyFromReg(Chain, IA64::r8, MVT::i64, InFlag);
500 InFlag = boolInR8.getValue(2);
501 Chain = boolInR8.getValue(1);
502 SDOperand zeroReg = DAG.getCopyFromReg(Chain, IA64::r0, MVT::i64, InFlag);
503 InFlag = zeroReg.getValue(2);
504 Chain = zeroReg.getValue(1);
506 RetVal = DAG.getSetCC(MVT::i1, boolInR8, zeroReg, ISD::SETNE);
512 RetVal = DAG.getCopyFromReg(Chain, IA64::r8, MVT::i64, InFlag);
513 Chain = RetVal.getValue(1);
515 // keep track of whether it is sign or zero extended (todo: bools?)
517 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext,
518 MVT::i64, RetVal, DAG.getValueType(RetTyVT));
520 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
523 RetVal = DAG.getCopyFromReg(Chain, IA64::r8, MVT::i64, InFlag);
524 Chain = RetVal.getValue(1);
525 InFlag = RetVal.getValue(2); // XXX dead
528 RetVal = DAG.getCopyFromReg(Chain, IA64::F8, MVT::f64, InFlag);
529 Chain = RetVal.getValue(1);
530 RetVal = DAG.getNode(ISD::TRUNCATE, MVT::f32, RetVal);
533 RetVal = DAG.getCopyFromReg(Chain, IA64::F8, MVT::f64, InFlag);
534 Chain = RetVal.getValue(1);
535 InFlag = RetVal.getValue(2); // XXX dead
540 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
541 DAG.getConstant(NumBytes, getPointerTy()));
543 return std::make_pair(RetVal, Chain);
546 std::pair<SDOperand, SDOperand> IA64TargetLowering::
547 LowerFrameReturnAddress(bool isFrameAddress, SDOperand Chain, unsigned Depth,
549 assert(0 && "LowerFrameReturnAddress unimplemented");
553 SDOperand IA64TargetLowering::
554 LowerOperation(SDOperand Op, SelectionDAG &DAG) {
555 switch (Op.getOpcode()) {
556 default: assert(0 && "Should not custom lower this!");
558 SDOperand AR_PFSVal, Copy;
560 switch(Op.getNumOperands()) {
562 assert(0 && "Do not know how to return this many arguments!");
565 AR_PFSVal = DAG.getCopyFromReg(Op.getOperand(0), VirtGPR, MVT::i64);
566 AR_PFSVal = DAG.getCopyToReg(AR_PFSVal.getValue(1), IA64::AR_PFS,
568 return DAG.getNode(IA64ISD::RET_FLAG, MVT::Other, AR_PFSVal);
570 // Copy the result into the output register & restore ar.pfs
571 MVT::ValueType ArgVT = Op.getOperand(1).getValueType();
572 unsigned ArgReg = MVT::isInteger(ArgVT) ? IA64::r8 : IA64::F8;
574 AR_PFSVal = DAG.getCopyFromReg(Op.getOperand(0), VirtGPR, MVT::i64);
575 Copy = DAG.getCopyToReg(AR_PFSVal.getValue(1), ArgReg, Op.getOperand(1),
577 AR_PFSVal = DAG.getCopyToReg(Copy.getValue(0), IA64::AR_PFS, AR_PFSVal,
579 return DAG.getNode(IA64ISD::RET_FLAG, MVT::Other,
580 AR_PFSVal, AR_PFSVal.getValue(1));
586 MVT::ValueType VT = getPointerTy();
587 SDOperand VAList = DAG.getLoad(VT, Op.getOperand(0), Op.getOperand(1),
589 // Increment the pointer, VAList, to the next vaarg
590 SDOperand VAIncr = DAG.getNode(ISD::ADD, VT, VAList,
591 DAG.getConstant(MVT::getSizeInBits(VT)/8,
593 // Store the incremented VAList to the legalized pointer
594 VAIncr = DAG.getNode(ISD::STORE, MVT::Other, VAList.getValue(1), VAIncr,
595 Op.getOperand(1), Op.getOperand(2));
596 // Load the actual argument out of the pointer VAList
597 return DAG.getLoad(Op.getValueType(), VAIncr, VAList, DAG.getSrcValue(0));
600 // vastart just stores the address of the VarArgsFrameIndex slot into the
601 // memory location argument.
602 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i64);
603 return DAG.getNode(ISD::STORE, MVT::Other, Op.getOperand(0), FR,
604 Op.getOperand(1), Op.getOperand(2));