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If the coalescer commuted a def MI to allow coalescing, it can changed a previously coalesced copy into an non-identity copy. 

llvm-svn: 48752
This commit is contained in:
Evan Cheng 2008-03-24 23:31:21 +00:00
parent 6e225173c5
commit 69a3f9c417
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -323,7 +323,8 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
MachineInstr *UseMI = &*UI; MachineInstr *UseMI = &*UI;
++UI; ++UI;
if (JoinedCopies.count(UseMI)) if (JoinedCopies.count(UseMI))
continue; // It'll no longer be "joined" after the change.
JoinedCopies.erase(UseMI);
unsigned UseIdx = li_->getInstructionIndex(UseMI); unsigned UseIdx = li_->getInstructionIndex(UseMI);
LiveInterval::iterator ULR = IntA.FindLiveRangeContaining(UseIdx); LiveInterval::iterator ULR = IntA.FindLiveRangeContaining(UseIdx);
if (ULR->valno != AValNo) if (ULR->valno != AValNo)