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When unfolding a load, avoid assuming which instruction that 

kill and dead flags will end up on.

llvm-svn: 106520
This commit is contained in:
Dan Gohman 2010-06-22 02:07:21 +00:00
parent b6e058da18
commit 2370e2fe0f
1 changed files with 18 additions and 4 deletions
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22
llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -964,10 +964,24 @@ TryInstructionTransform(MachineBasicBlock::iterator &mi,
if (MO.isReg() && MO.getReg() != 0 &&
TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
if (MO.isUse()) {
if (MO.isKill())
LV->replaceKillInstruction(MO.getReg(), mi, NewMIs[0]);
} else if (LV->removeVirtualRegisterDead(MO.getReg(), mi))
LV->addVirtualRegisterDead(MO.getReg(), NewMIs[1]);
if (MO.isKill()) {
if (NewMIs[0]->killsRegister(MO.getReg()))
LV->replaceKillInstruction(MO.getReg(), mi, NewMIs[0]);
else {
assert(NewMIs[1]->killsRegister(MO.getReg()) &&
"Kill missing after load unfold!");
LV->replaceKillInstruction(MO.getReg(), mi, NewMIs[1]);
}
}
} else if (LV->removeVirtualRegisterDead(MO.getReg(), mi)) {
if (NewMIs[1]->registerDefIsDead(MO.getReg()))
LV->addVirtualRegisterDead(MO.getReg(), NewMIs[1]);
else {
assert(NewMIs[0]->registerDefIsDead(MO.getReg()) &&
"Dead flag missing after load unfold!");
LV->addVirtualRegisterDead(MO.getReg(), NewMIs[0]);
}
}
}
}
LV->addVirtualRegisterKilled(Reg, NewMIs[1]);