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Revert r216803 "[MachineSinking] Clear kill flag of all operands at all their uses."

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This reverts commit r216803, because it might have broken the buildbot.
The issue is tracked in PR20842.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217120 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Juergen Ributzka
2014-09-04 02:07:36 +00:00
parent 319b5d0e8e
commit cd72c216cd
2 changed files with 3 additions and 40 deletions
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16
lib/CodeGen/MachineSink.cpp
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@ -724,19 +724,9 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore) {
++MachineBasicBlock::iterator(DbgMI));
}
// When sinking the instruction the live time of its operands can be extended
// bejond their original last use (marked with a kill flag). Conservatively
// clear the kill flag in all instructions that use the same operand
// registers.
for (auto &MO : MI->uses())
if (MO.isReg() && MO.isUse()) {
// Preserve the kill flag for this instruction.
bool IsKill = MO.isKill();
// Clear the kill flag in all instruction that use this operand.
MRI->clearKillFlags(MO.getReg());
// Restore the kill flag for only this instruction.
MO.setIsKill(IsKill);
}
// Conservatively, clear any kill flags, since it's possible that they are no
// longer correct.
MI->clearKillInfo();
return true;
}