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Lowering of atomic instructions can result in operands being

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used more than once. If ISel had put a kill flag on one of them,
it's not valid to transfer the kill flag to each new instance.

llvm-svn: 103799
This commit is contained in:
Dan Gohman 2010-05-14 21:01:44 +00:00
parent 2b99c27e47
commit 6517cc1dd9
1 changed files with 7 additions and 1 deletions
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8
lib/Target/X86/X86ISelLowering.cpp
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@ -7988,9 +7988,15 @@ X86TargetLowering::EmitAtomicBit6432WithCustomInserter(MachineInstr *bInstr,
MachineOperand& dest1Oper = bInstr->getOperand(0);
MachineOperand& dest2Oper = bInstr->getOperand(1);
MachineOperand* argOpers[2 + X86AddrNumOperands];
for (int i=0; i < 2 + X86AddrNumOperands; ++i)
for (int i=0; i < 2 + X86AddrNumOperands; ++i) {
argOpers[i] = &bInstr->getOperand(i+2);
// We use some of the operands multiple times, so conservatively just
// clear any kill flags that might be present.
if (argOpers[i]->isReg() && argOpers[i]->isUse())
argOpers[i]->setIsKill(false);
}
// x86 address has 5 operands: base, index, scale, displacement, and segment.
int lastAddrIndx = X86AddrNumOperands - 1; // [0,3]