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We never call adjustCopiesBackFrom() for partial copies.

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There is no need to look at an always null SrcIdx.

llvm-svn: 156866
This commit is contained in:
Jakob Stoklund Olesen 2012-05-15 22:18:49 +00:00
parent e481053e50
commit 109ee15f5d
1 changed files with 3 additions and 1 deletions
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4
lib/CodeGen/RegisterCoalescer.cpp
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@ -408,6 +408,8 @@ void RegisterCoalescer::markAsJoined(MachineInstr *CopyMI) {
///
bool RegisterCoalescer::adjustCopiesBackFrom(const CoalescerPair &CP,
MachineInstr *CopyMI) {
assert(!CP.isPartial() && "This doesn't work for partial copies.");
// Bail if there is no dst interval - can happen when merging physical subreg
// operations.
if (!LIS->hasInterval(CP.getDstReg()))
@ -529,7 +531,7 @@ bool RegisterCoalescer::adjustCopiesBackFrom(const CoalescerPair &CP,
// Rewrite the copy. If the copy instruction was killing the destination
// register before the merge, find the last use and trim the live range. That
// will also add the isKill marker.
CopyMI->substituteRegister(IntA.reg, IntB.reg, CP.getSrcIdx(), *TRI);
CopyMI->substituteRegister(IntA.reg, IntB.reg, 0, *TRI);
if (ALR->end == CopyIdx)
LIS->shrinkToUses(&IntA);