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Implemented correct stack probing on mingw/cygwin for dynamic alloca's.

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Also, fixed static case in presence of eax livin. This fixes PR331

PS: Why don't we still have push/pop instructions? :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2007-04-17 09:20:00 +00:00
parent 56398e39d7
commit 57fc00d5cf
7 changed files with 102 additions and 11 deletions
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36
lib/Target/X86/X86ISelLowering.cpp
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@@ -237,7 +237,10 @@ X86TargetLowering::X86TargetLowering(TargetMachine &TM)
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
if (Subtarget->is64Bit())
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
if (Subtarget->isTargetCygMing())
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Custom);
else
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
if (X86ScalarSSE) {
// Set up the FP register classes.
@@ -3401,6 +3404,36 @@ SDOperand X86TargetLowering::LowerCALL(SDOperand Op, SelectionDAG &DAG) {
}
}
SDOperand X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDOperand Op,
SelectionDAG &DAG) {
// Get the inputs.
SDOperand Chain = Op.getOperand(0);
SDOperand Size = Op.getOperand(1);
// FIXME: Ensure alignment here
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
MVT::ValueType IntPtr = getPointerTy();
MVT::ValueType SPTy = (Subtarget->is64Bit() ? MVT::i64 : MVT::i32);
const Type *IntPtrTy = getTargetData()->getIntPtrType();
Entry.Node = Size;
Entry.Ty = IntPtrTy;
Entry.isInReg = true; // Should pass in EAX
Args.push_back(Entry);
std::pair<SDOperand, SDOperand> CallResult =
LowerCallTo(Chain, IntPtrTy, false, false, CallingConv::C, false,
DAG.getExternalSymbol("_alloca", IntPtr), Args, DAG);
SDOperand SP = DAG.getCopyFromReg(CallResult.second, X86StackPtr, SPTy);
std::vector<MVT::ValueType> Tys;
Tys.push_back(SPTy);
Tys.push_back(MVT::Other);
SDOperand Ops[2] = { SP, CallResult.second };
return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2);
}
SDOperand
X86TargetLowering::LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG) {
MachineFunction &MF = DAG.getMachineFunction();
@@ -4002,6 +4035,7 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &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);
case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
}
return SDOperand();
}