[PATCH] D78248: [RegisterCoalescer] Extend a subrange if needed when filling range gap

[Krzysztof Parzyszek via Phabricator via llvm-commits]

kparzysz created this revision.
kparzysz added reviewers: qcolombet, arsenm.
Herald added subscribers: tpr, hiraditya, wdng, MatzeB.
Herald added a project: LLVM.

Register live ranges may have had gaps that after coalescing should be removed. This is done by adding a new segment to the range, and merging it with neighboring segments. When doing so, do not assume that each subrange of the register ended at the same index. If a subrange ended earlier, adding this segment could make the live range invalid. Instead, if the subrange is not live at the start of the segment, extend it first.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78248

Files:
  llvm/lib/CodeGen/RegisterCoalescer.cpp
  llvm/test/CodeGen/Hexagon/regalloc-coal-extend-short-subrange.mir

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