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Immediately erase trivially useless copies.

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There is no need for these instructions to stick around since they are
known to be not dead.

llvm-svn: 157102
This commit is contained in:
Jakob Stoklund Olesen 2012-05-19 05:25:53 +00:00
parent 1cb1222e6c
commit ab9a075f26
1 changed files with 4 additions and 2 deletions
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6
lib/CodeGen/RegisterCoalescer.cpp
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@ -1070,15 +1070,17 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) {
// If they are already joined we continue.
if (CP.getSrcReg() == CP.getDstReg()) {
markAsJoined(CopyMI);
DEBUG(dbgs() << "\tCopy already coalesced.\n");
LIS->RemoveMachineInstrFromMaps(CopyMI);
CopyMI->eraseFromParent();
return false; // Not coalescable.
}
// Eliminate undefs.
if (!CP.isPhys() && eliminateUndefCopy(CopyMI, CP)) {
markAsJoined(CopyMI);
DEBUG(dbgs() << "\tEliminated copy of <undef> value.\n");
LIS->RemoveMachineInstrFromMaps(CopyMI);
CopyMI->eraseFromParent();
return false; // Not coalescable.
}