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We never call adjustCopiesBackFrom() for partial copies.
There is no need to look at an always null SrcIdx. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156866 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -408,6 +408,8 @@ void RegisterCoalescer::markAsJoined(MachineInstr *CopyMI) {
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///
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bool RegisterCoalescer::adjustCopiesBackFrom(const CoalescerPair &CP,
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MachineInstr *CopyMI) {
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assert(!CP.isPartial() && "This doesn't work for partial copies.");
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// Bail if there is no dst interval - can happen when merging physical subreg
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// operations.
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if (!LIS->hasInterval(CP.getDstReg()))
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@ -529,7 +531,7 @@ bool RegisterCoalescer::adjustCopiesBackFrom(const CoalescerPair &CP,
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// Rewrite the copy. If the copy instruction was killing the destination
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// register before the merge, find the last use and trim the live range. That
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// will also add the isKill marker.
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CopyMI->substituteRegister(IntA.reg, IntB.reg, CP.getSrcIdx(), *TRI);
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CopyMI->substituteRegister(IntA.reg, IntB.reg, 0, *TRI);
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if (ALR->end == CopyIdx)
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LIS->shrinkToUses(&IntA);
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