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simplify sret handling

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34728 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-02-28 05:39:26 +00:00
parent 423c5f44f8
commit c0bdf3460c
1 changed files with 5 additions and 13 deletions
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18
lib/Target/X86/X86ISelLowering.cpp
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@ -819,7 +819,6 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG,
SmallVector<SDOperand, 8> MemOpChains;
SDOperand StackPtr;
unsigned NumSRetBytes = 0;
// Walk the register/memloc assignments, inserting copies/loads.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
@ -850,19 +849,12 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG,
SDOperand PtrOff = DAG.getConstant(VA.getLocMemOffset(), getPointerTy());
PtrOff = DAG.getNode(ISD::ADD, getPointerTy(), StackPtr, PtrOff);
MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
// FIXME: What is this doing?
unsigned Flags =
cast<ConstantSDNode>(Op.getOperand(5+2*VA.getValNo()+1))->getValue();
if ((Flags >> 2) & 1)
NumSRetBytes += 4;
}
}
// Sanity check: we haven't seen NumSRetBytes > 4
assert((NumSRetBytes<=4) &&
"Too much space for struct-return pointer requested");
// If the first argument is an sret pointer, remember it.
bool isSRet = NumOps &&(cast<ConstantSDNode>(Op.getOperand(6))->getValue()&4);
if (!MemOpChains.empty())
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
&MemOpChains[0], MemOpChains.size());
@ -926,14 +918,14 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG,
if (CC == CallingConv::X86_StdCall) {
if (isVarArg)
NumBytesForCalleeToPush = NumSRetBytes;
NumBytesForCalleeToPush = isSRet ? 4 : 0;
else
NumBytesForCalleeToPush = NumBytes;
} else {
// If this is is a call to a struct-return function, the callee
// pops the hidden struct pointer, so we have to push it back.
// This is common for Darwin/X86, Linux & Mingw32 targets.
NumBytesForCalleeToPush = NumSRetBytes;
NumBytesForCalleeToPush = isSRet ? 4 : 0;
}
NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);