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X86-64 VACOPY needs custom expansion. va_list is a struct { i32, i32, i8*, i8* }.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34857 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-03-02 23:16:35 +00:00
parent e8391e039e
commit ae6421935b
2 changed files with 34 additions and 3 deletions
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36
lib/Target/X86/X86ISelLowering.cpp
View File

@ -236,11 +236,13 @@ X86TargetLowering::X86TargetLowering(TargetMachine &TM)
// VASTART needs to be custom lowered to use the VarArgsFrameIndex
setOperationAction(ISD::VASTART , MVT::Other, Custom);
// Use the default implementation.
setOperationAction(ISD::VAARG , MVT::Other, Expand);
setOperationAction(ISD::VACOPY , MVT::Other, Expand);
setOperationAction(ISD::VAEND , MVT::Other, Expand);
if (Subtarget->is64Bit())
setOperationAction(ISD::VACOPY , MVT::Other, Custom);
else
setOperationAction(ISD::VACOPY , MVT::Other, Expand);
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
if (Subtarget->is64Bit())
@ -3761,6 +3763,33 @@ SDOperand X86TargetLowering::LowerVASTART(SDOperand Op, SelectionDAG &DAG) {
return DAG.getNode(ISD::TokenFactor, MVT::Other, &MemOps[0], MemOps.size());
}
SDOperand X86TargetLowering::LowerVACOPY(SDOperand Op, SelectionDAG &DAG) {
// X86-64 va_list is a struct { i32, i32, i8*, i8* }.
SDOperand Chain = Op.getOperand(0);
SDOperand DstPtr = Op.getOperand(1);
SDOperand SrcPtr = Op.getOperand(2);
SrcValueSDNode *DstSV = cast<SrcValueSDNode>(Op.getOperand(3));
SrcValueSDNode *SrcSV = cast<SrcValueSDNode>(Op.getOperand(4));
SrcPtr = DAG.getLoad(getPointerTy(), Chain, SrcPtr,
SrcSV->getValue(), SrcSV->getOffset());
Chain = SrcPtr.getValue(1);
for (unsigned i = 0; i < 3; ++i) {
SDOperand Val = DAG.getLoad(MVT::i64, Chain, SrcPtr,
SrcSV->getValue(), SrcSV->getOffset());
Chain = Val.getValue(1);
Chain = DAG.getStore(Chain, Val, DstPtr,
DstSV->getValue(), DstSV->getOffset());
if (i == 2)
break;
SrcPtr = DAG.getNode(ISD::ADD, getPointerTy(), SrcPtr,
DAG.getConstant(8, getPointerTy()));
DstPtr = DAG.getNode(ISD::ADD, getPointerTy(), DstPtr,
DAG.getConstant(8, getPointerTy()));
}
return Chain;
}
SDOperand
X86TargetLowering::LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG) {
unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getValue();
@ -3925,6 +3954,7 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
case ISD::MEMCPY: return LowerMEMCPY(Op, DAG);
case ISD::READCYCLECOUNTER: return LowerREADCYCLCECOUNTER(Op, DAG);
case ISD::VASTART: return LowerVASTART(Op, DAG);
case ISD::VACOPY: return LowerVACOPY(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);

1
lib/Target/X86/X86ISelLowering.h
View File

@ -405,6 +405,7 @@ namespace llvm {
SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerREADCYCLCECOUNTER(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerVACOPY(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerRETURNADDR(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerFRAMEADDR(SDOperand Op, SelectionDAG &DAG);