[PATCH] D64371: [AArch64][GlobalISel] Use TST for comparisons when possible

[Jessica Paquette via Phabricator via llvm-commits]

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

Porting over the part of `emitComparison` in AArch64ISelLowering where we use TST to represent a compare.

- Rename `tryOptCMN` to `tryFoldIntegerCompare`, since it now also emits TSTs when possible.
- Add a utility function for emitting a TST with register operands.
- Rename opt-fold-cmn.mir to opt-fold-compare.mir, since it now also tests the TST fold as well.


https://reviews.llvm.org/D64371

Files:
  llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/opt-fold-cmn.mir
  llvm/test/CodeGen/AArch64/GlobalISel/opt-fold-compare.mir

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