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A restore is promoted to copy (or deleted entirely), remove the kill from the last use of the targetted register.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34773 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-03-01 02:27:30 +00:00
parent 23322d1427
commit c0ba1bc49b
1 changed files with 4 additions and 3 deletions
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7
lib/CodeGen/VirtRegMap.cpp
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@ -855,14 +855,15 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
} else
DOUT << "Removing now-noop copy: " << MI;
// Extend the live range of the MI that last kill the register if
// the next MI reuse it.
// Either way, the live range of the last kill of InReg has been
// extended. Remove its kill.
MachineOperand *MOK = SSMI->findRegisterUseOperand(InReg, true);
if (MOK && NextMII != MBB.end()) {
MOK->unsetIsKill();
// If NextMII uses InReg (must be the copy?), mark it killed.
MachineOperand *MOU = NextMII->findRegisterUseOperand(InReg);
if (MOU) {
MOU->setIsKill();
MOK->unsetIsKill();
Spills.UpdateLastUse(InReg, &(*NextMII));
}
}