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Handle cases where a register and one of its super-register are both marked as

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defined on the same instruction. This fixes PR1767.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43699 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-11-05 03:11:55 +00:00
parent 801e5a98bf
commit 5942efb0e5
2 changed files with 20 additions and 2 deletions
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6
lib/CodeGen/LiveVariables.cpp
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@ -203,7 +203,7 @@ bool LiveVariables::addRegisterKilled(unsigned IncomingReg, MachineInstr *MI,
RegInfo->isSuperRegister(IncomingReg, Reg) &&
MO.isKill())
// A super-register kill already exists.
return true;
Found = true;
}
}
@ -357,7 +357,9 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
} else if (PhysRegPartUse[Reg])
// Add implicit use / kill to last partial use.
addRegisterKilled(Reg, PhysRegPartUse[Reg], true);
else
else if (LastRef != MI)
// Defined, but not used. However, watch out for cases where a super-reg
// is also defined on the same MI.
addRegisterDead(Reg, LastRef);
}