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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.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48752 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-24 23:31:21 +00:00
parent af8c563e11
commit 6f83fc8afb
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -323,7 +323,8 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
MachineInstr *UseMI = &*UI;
++UI;
if (JoinedCopies.count(UseMI))
continue;
// It'll no longer be "joined" after the change.
JoinedCopies.erase(UseMI);
unsigned UseIdx = li_->getInstructionIndex(UseMI);
LiveInterval::iterator ULR = IntA.FindLiveRangeContaining(UseIdx);
if (ULR->valno != AValNo)