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Allow for more than one DBG_VALUE targeting the

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same dead instruction.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95890 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2010-02-11 18:23:23 +00:00
parent 3bfef03eb6
commit 39c7a198ea
1 changed files with 4 additions and 4 deletions
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8
lib/CodeGen/DeadMachineInstructionElim.cpp
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@ -117,10 +117,10 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
// the former operand will then be deleted normally.
if (MI->getNumOperands()==3 && MI->getOperand(0).isReg()) {
unsigned Reg = MI->getOperand(0).getReg();
MachineRegisterInfo::use_iterator I = MRI->use_begin(Reg);
assert(I != MRI->use_end());
if (++I == MRI->use_end())
// only one use, which must be this DBG_VALUE.
MachineRegisterInfo::use_nodbg_iterator I = MRI->use_nodbg_begin(Reg);
if (I == MRI->use_nodbg_end())
// All uses are DBG_VALUEs. Nullify this one; if we find
// others later we will nullify them then.
MI->getOperand(0).setReg(0U);
}
}