[PATCH] D85966: [GlobalISel] Add a combine for sext_inreg(load x), c --> sextload x

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
aemerson added reviewers: paquette, arsenm.
Herald added subscribers: jfb, hiraditya, kristof.beyls, rovka.
Herald added a project: LLVM.
aemerson requested review of this revision.
Herald added a subscriber: wdng.

This is restricted to single use loads, which if we fold to sextloads we can find more optimal addressing modes on AArch64.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D85966

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/include/llvm/Target/GlobalISel/Combine.td
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/prelegalizercombiner-sextload-from-sextinreg.mir

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