diff options
| 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 | fe181f4848a8c774155b8d853c2f53f7e7679872 (patch) | |
| tree | 1c4faaf799c639b3af3eeff412ee2cf01520cdcb /lib/CodeGen/TwoAddressInstructionPass.cpp | |
| parent | 86050dc8cc0aaea8c9dfeb89de02cafbd7f48d92 (diff) | |
Only run CoalesceExtSubRegs when we can expect LiveIntervalAnalysis to clean up
the inserted INSERT_SUBREGs after us.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106345 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/TwoAddressInstructionPass.cpp')
| -rw-r--r-- | lib/CodeGen/TwoAddressInstructionPass.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp index 048b6698a7..14102d1f3d 100644 --- a/lib/CodeGen/TwoAddressInstructionPass.cpp +++ b/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(); |