[llvm-commits] [llvm] r106345 - /llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp
Jakob Stoklund Olesen
stoklund at 2pi.dk
Fri Jun 18 16:10:20 PDT 2010
Author: stoklund
Date: Fri Jun 18 18:10:20 2010
New Revision: 106345
URL: http://llvm.org/viewvc/llvm-project?rev=106345&view=rev
Log:
Only run CoalesceExtSubRegs when we can expect LiveIntervalAnalysis to clean up
the inserted INSERT_SUBREGs after us.
Modified:
llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp
Modified: llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp?rev=106345&r1=106344&r2=106345&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp (original)
+++ llvm/trunk/lib/CodeGen/TwoAddressInstructionPass.cpp Fri Jun 18 18:10:20 2010
@@ -1397,8 +1397,11 @@
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();
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