[PATCH] D100945: [GreedyRA] Fix removeBackCopies to account empty copies

[Serguei Katkov via Phabricator via llvm-commits]

skatkov created this revision.
skatkov added reviewers: reames, MatzeB, rnk, wmi, qcolombet, void.
Herald added subscribers: pengfei, jfb, hiraditya.
skatkov requested review of this revision.
Herald added a project: LLVM.

RegAssignMap cannot hold empty interval, so do not set stop
to kill value if it produces empty interval.

This can happen if we remove back-copy and right before that we have another
back-copy.


https://reviews.llvm.org/D100945

Files:
  llvm/lib/CodeGen/SplitKit.cpp
  llvm/test/CodeGen/X86/statepoint-invoke-ra-remove-back-copies.mir

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