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If a target specified a stack pointer with setStackPointerRegisterToSaveRestore, 

lower STACKSAVE/STACKRESTORE into a copy from/to that register.

llvm-svn: 25276
This commit is contained in:
Chris Lattner 2006-01-13 17:48:44 +00:00
parent 3b8b0c4f6a
commit ed9b3e1c0a
1 changed files with 21 additions and 5 deletions
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26
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -1453,10 +1453,20 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
return Result.getValue(Op.ResNo);
case TargetLowering::Expand:
Tmp1 = DAG.getNode(ISD::UNDEF, Node->getValueType(0));
AddLegalizedOperand(SDOperand(Node, 0), Tmp1);
AddLegalizedOperand(SDOperand(Node, 1), Node->getOperand(0));
return Op.ResNo ? Node->getOperand(0) : Tmp1;
// Expand to CopyFromReg if the target set
// StackPointerRegisterToSaveRestore.
if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
Tmp1 = DAG.getCopyFromReg(Node->getOperand(0), SP,
Node->getValueType(0));
AddLegalizedOperand(SDOperand(Node, 0), Tmp1);
AddLegalizedOperand(SDOperand(Node, 1), Tmp1.getValue(1));
return Tmp1.getValue(Op.ResNo);
} else {
Tmp1 = DAG.getNode(ISD::UNDEF, Node->getValueType(0));
AddLegalizedOperand(SDOperand(Node, 0), Tmp1);
AddLegalizedOperand(SDOperand(Node, 1), Node->getOperand(0));
return Op.ResNo ? Node->getOperand(0) : Tmp1;
}
}
case ISD::STACKRESTORE:
@ -1478,7 +1488,13 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
case TargetLowering::Legal:
break;
case TargetLowering::Expand:
Result = Tmp1;
// Expand to CopyToReg if the target set
// StackPointerRegisterToSaveRestore.
if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
Result = DAG.getCopyToReg(Tmp1, SP, Tmp2);
} else {
Result = Tmp1;
}
break;
}
break;