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Delete merged physreg copies in joinReservedPhysReg().

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Previously, the identity copy would survive through register allocation
before it was removed by the rewriter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161269 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-08-03 22:12:51 +00:00
parent 982dc84762
commit e744ac49f4
1 changed files with 5 additions and 0 deletions

5
lib/CodeGen/RegisterCoalescer.cpp

@ -1091,6 +1091,11 @@ bool RegisterCoalescer::joinReservedPhysReg(CoalescerPair &CP) {
// register live range doesn't need to be accurate as long as all the
// defs are there.
// Delete the identity copy.
MachineInstr *CopyMI = MRI->getVRegDef(RHS.reg);
LIS->RemoveMachineInstrFromMaps(CopyMI);
CopyMI->eraseFromParent();
// We don't track kills for reserved registers.
MRI->clearKillFlags(CP.getSrcReg());