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Fixed PR4090.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71495 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2009-05-11 23:14:13 +00:00
parent 5792f51e12
commit 9c992f1141
1 changed files with 16 additions and 1 deletions
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17
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -608,14 +608,29 @@ bool SimpleRegisterCoalescing::ReMaterializeTrivialDef(LiveInterval &SrcInt,
// If copy kills the source register, find the last use and propagate // If copy kills the source register, find the last use and propagate
// kill. // kill.
bool checkForDeadDef = false;
MachineBasicBlock *MBB = CopyMI->getParent(); MachineBasicBlock *MBB = CopyMI->getParent();
if (CopyMI->killsRegister(SrcInt.reg)) if (CopyMI->killsRegister(SrcInt.reg))
TrimLiveIntervalToLastUse(CopyIdx, MBB, SrcInt, SrcLR); if (!TrimLiveIntervalToLastUse(CopyIdx, MBB, SrcInt, SrcLR)) {
checkForDeadDef = true;
}
MachineBasicBlock::iterator MII = next(MachineBasicBlock::iterator(CopyMI)); MachineBasicBlock::iterator MII = next(MachineBasicBlock::iterator(CopyMI));
CopyMI->removeFromParent(); CopyMI->removeFromParent();
tii_->reMaterialize(*MBB, MII, DstReg, DefMI); tii_->reMaterialize(*MBB, MII, DstReg, DefMI);
MachineInstr *NewMI = prior(MII); MachineInstr *NewMI = prior(MII);
if (checkForDeadDef) {
// PR4090 fix: Trim interval failed because there was no use of the
// source interval in this MBB. If the def is in this MBB too then we
// should mark it dead:
if (DefMI->getParent() == MBB) {
DefMI->addRegisterDead(SrcInt.reg, tri_);
SrcLR->end = SrcLR->start + 1;
}
}
// CopyMI may have implicit operands, transfer them over to the newly // CopyMI may have implicit operands, transfer them over to the newly
// rematerialized instruction. And update implicit def interval valnos. // rematerialized instruction. And update implicit def interval valnos.
for (unsigned i = CopyMI->getDesc().getNumOperands(), for (unsigned i = CopyMI->getDesc().getNumOperands(),