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Fix SingleSource/Regression/C/2004-08-12-InlinerAndAllocas.c on Sparc.

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The ABI specifies that there is a register save area at the bottom of the
stack, which means the actual used pointer needs to be an offset from
the subtracted value.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26202 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-02-15 06:41:34 +00:00
parent 197ab8787f
commit 6fa1f57c66
1 changed files with 22 additions and 1 deletions
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23
lib/Target/Sparc/SparcISelDAGToDAG.cpp
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@ -211,7 +211,7 @@ SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
setOperationAction(ISD::VAEND , MVT::Other, Expand);
setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
@ -807,6 +807,27 @@ LowerOperation(SDOperand Op, SelectionDAG &DAG) {
return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops);
}
}
case ISD::DYNAMIC_STACKALLOC: {
SDOperand Chain = Op.getOperand(0); // Legalize the chain.
SDOperand Size = Op.getOperand(1); // Legalize the size.
unsigned SPReg = SP::O6;
SDOperand SP = DAG.getCopyFromReg(Chain, SPReg, MVT::i32);
SDOperand NewSP = DAG.getNode(ISD::SUB, MVT::i32, SP, Size); // Value
Chain = DAG.getCopyToReg(SP.getValue(1), SPReg, NewSP); // Output chain
// The resultant pointer is actually 16 words from the bottom of the stack,
// to provide a register spill area.
SDOperand NewVal = DAG.getNode(ISD::ADD, MVT::i32, NewSP,
DAG.getConstant(96, MVT::i32));
std::vector<MVT::ValueType> Tys;
Tys.push_back(MVT::i32);
Tys.push_back(MVT::Other);
std::vector<SDOperand> Ops;
Ops.push_back(NewVal);
Ops.push_back(Chain);
return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops);
}
case ISD::RET: {
SDOperand Copy;