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At -O0, multiple uses of a virtual registers in the same BB are being marked

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"kill". This looks like a bug upstream. Since that's going to take some time
to understand, loosen the assertion and disable the optimization when
multiple kills are seen.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144568 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2011-11-14 21:02:09 +00:00
parent 4d0a9ff365
commit 41e00172c5
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -502,7 +502,8 @@ MachineInstr *findLocalKill(unsigned Reg, MachineBasicBlock *MBB,
continue;
if (!UI.getOperand().isKill())
return 0;
assert(!KillMI && "More than one local kills?");
if (KillMI)
return 0; // -O0 kill markers cannot be trusted?
KillMI = UseMI;
}