[PATCH] D80458: [AArch64][GlobalISel] Enable extending loads combines post-legalization.

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
aemerson added a reviewer: paquette.
aemerson added a project: LLVM.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, rovka.

During legalization we can end up with extends of loads, which in the case of zexts causes us to not hit tablegen imported patterns.

The caveat here is that we don't want anyext load forming, since some variants are illegal.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80458

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/include/llvm/Target/GlobalISel/Combine.td
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/lib/Target/AArch64/AArch64Combine.td
  llvm/test/CodeGen/AArch64/GlobalISel/postlegalizercombiner-extending-loads.mir

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