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Teach MachineLICM and MachineSink how to clear kill flags conservatively

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when they move instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103737 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-05-13 20:34:42 +00:00
parent 1e5a6c46b8
commit e6cd757e68
4 changed files with 31 additions and 1 deletions
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10
lib/CodeGen/MachineInstr.cpp
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@ -938,6 +938,16 @@ isRegTiedToDefOperand(unsigned UseOpIdx, unsigned *DefOpIdx) const {
return true;
}
/// clearKillInfo - Clears kill flags on all operands.
///
void MachineInstr::clearKillInfo() {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (MO.isReg() && MO.isUse())
MO.setIsKill(false);
}
}
/// copyKillDeadInfo - Copies kill / dead operand properties from MI.
///
void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) {