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PR10136: fix PPCTargetLowering::LowerCall_SVR4 so that a necessary CopyToReg doesn't appear to be dead.

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Roman, since you're writing tests for other PPC-SVR4 vararg-related stuff, would you mind writing a test for this?

llvm-svn: 133018
This commit is contained in:
Eli Friedman 2011-06-14 22:16:20 +00:00
parent fe991c37ab
commit 3caa6e7fe5
1 changed files with 6 additions and 7 deletions
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13
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -2902,6 +2902,12 @@ PPCTargetLowering::LowerCall_SVR4(SDValue Chain, SDValue Callee,
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOpChains[0], MemOpChains.size());
// Set CR6 to true if this is a vararg call.
if (isVarArg) {
SDValue SetCR(DAG.getMachineNode(PPC::CRSET, dl, MVT::i32), 0);
RegsToPass.push_back(std::make_pair(unsigned(PPC::CR1EQ), SetCR));
}
// Build a sequence of copy-to-reg nodes chained together with token chain
// and flag operands which copy the outgoing args into the appropriate regs.
SDValue InFlag;
@ -2911,13 +2917,6 @@ PPCTargetLowering::LowerCall_SVR4(SDValue Chain, SDValue Callee,
InFlag = Chain.getValue(1);
}
// Set CR6 to true if this is a vararg call.
if (isVarArg) {
SDValue SetCR(DAG.getMachineNode(PPC::CRSET, dl, MVT::i32), 0);
Chain = DAG.getCopyToReg(Chain, dl, PPC::CR1EQ, SetCR, InFlag);
InFlag = Chain.getValue(1);
}
if (isTailCall)
PrepareTailCall(DAG, InFlag, Chain, dl, false, SPDiff, NumBytes, LROp, FPOp,
false, TailCallArguments);