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Restoration of the stack pointer after a deallocation of a alloca was not

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updating the SP link.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32202 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey 2006-12-04 22:04:42 +00:00
parent 67263fec75
commit efc7e52183
1 changed files with 28 additions and 1 deletions
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29
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -170,7 +170,7 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
setOperationAction(ISD::VACOPY , MVT::Other, Expand);
setOperationAction(ISD::VAEND , MVT::Other, Expand);
setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE , MVT::Other, Custom);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64 , Custom);
@ -1606,6 +1606,32 @@ static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
}
static SDOperand LowerSTACKRESTORE(SDOperand Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) {
// When we pop the dynamic allocation we need to restore the SP link.
// Get the corect type for pointers.
MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
// Construct the stack pointer operand.
bool IsPPC64 = Subtarget.isPPC64();
unsigned SP = IsPPC64 ? PPC::X1 : PPC::R1;
SDOperand StackPtr = DAG.getRegister(SP, PtrVT);
// Get the operands for the STACKRESTORE.
SDOperand Chain = Op.getOperand(0);
SDOperand SaveSP = Op.getOperand(1);
// Load the old link SP.
SDOperand LoadLinkSP = DAG.getLoad(PtrVT, Chain, StackPtr, NULL, 0);
// Restore the stack pointer.
Chain = DAG.getCopyToReg(LoadLinkSP.getValue(1), SP, SaveSP);
// Store the old link SP.
return DAG.getStore(Chain, LoadLinkSP, StackPtr, NULL, 0);
}
static SDOperand LowerDYNAMIC_STACKALLOC(SDOperand Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) {
MachineFunction &MF = DAG.getMachineFunction();
@ -2587,6 +2613,7 @@ SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex);
case ISD::CALL: return LowerCALL(Op, DAG);
case ISD::RET: return LowerRET(Op, DAG);
case ISD::STACKRESTORE: return LowerSTACKRESTORE(Op, DAG, PPCSubTarget);
case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG,
PPCSubTarget);