[PATCH] D65758: [AArch64][GlobalISel] Inline tiny memcpy et al at -O0

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
aemerson added a reviewer: paquette.
Herald added subscribers: Petar.Avramovic, volkan, hiraditya, kristof.beyls, javed.absar, rovka.
Herald added a project: LLVM.

FastISel already does this since the initial arm64 port was upstreamed, so it seems there are no issues with doing this at -O0 for very small memcpys.

Gives a 0.2% geomean code size improvement on CTMark.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D65758

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/lib/Target/AArch64/AArch64PreLegalizerCombiner.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/inline-small-memcpy.mir

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