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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-06-18 23:10:20 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-06-18 23:10:20 +0000 |
| commit | 678927e0b11a11c58afef2a3bb213c4f3cef3335 (patch) | |
| tree | 77505f5b2b9ad3a74da4a1f8aaf50830000bb2ff /llvm/lib/CodeGen | |
| parent | 2d51c7c5923c6cc6eab5e95c078cc4bfab5560a3 (diff) | |
| download | bcm5719-llvm-678927e0b11a11c58afef2a3bb213c4f3cef3335.tar.gz bcm5719-llvm-678927e0b11a11c58afef2a3bb213c4f3cef3335.zip | |
Only run CoalesceExtSubRegs when we can expect LiveIntervalAnalysis to clean up
the inserted INSERT_SUBREGs after us.
llvm-svn: 106345
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/TwoAddressInstructionPass.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp index 048b6698a73..14102d1f3dd 100644 --- a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp +++ b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp @@ -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(); |
