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Only run CoalesceExtSubRegs when we can expect LiveIntervalAnalysis to clean up

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the inserted INSERT_SUBREGs after us.

llvm-svn: 106345
This commit is contained in:
Jakob Stoklund Olesen 2010-06-18 23:10:20 +00:00
parent b5fadc47e0
commit 7150b84292
1 changed files with 5 additions and 2 deletions
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7
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -1397,8 +1397,11 @@ bool TwoAddressInstructionPass::EliminateRegSequences() {
MI->eraseFromParent();
}
// Try coalescing some EXTRACT_SUBREG instructions.
CoalesceExtSubRegs(RealSrcs, DstReg);
// Try coalescing some EXTRACT_SUBREG instructions. This can create
// INSERT_SUBREG instructions that must have <undef> flags added by
// LiveIntervalAnalysis, so only run it when LiveVariables is available.
if (LV)
CoalesceExtSubRegs(RealSrcs, DstReg);
}
RegSequences.clear();