RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-10-19 19:12:56 +02:00
Code Issues Projects Releases Wiki Activity

Immediately erase trivially useless copies.

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/CodeGen/RegisterCoalescer.cpp
View File

@ -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.
}