[PATCH] D87668: [GISel] Add new GISel combiners for G_MUL

[Michael Kitzan via Phabricator via llvm-commits]

mkitzan created this revision.
mkitzan added reviewers: arsenm, paquette, aditya_nandakumar, dsanders, volkan.
mkitzan added a project: LLVM.
Herald added subscribers: llvm-commits, kerbowa, hiraditya, kristof.beyls, tpr, nhaehnle, jvesely.
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Herald added a subscriber: wdng.

Patch adds two new GICombinerRules, one for `G_MUL(X, 1)` and another for `G_MUL(X, -1)`. `G_MUL(X, 1)` is an identity combine, and `G_MUL(X, -1)` gets replaced with `G_SUB(0, X)`. Patch additionally adds new combiner tests for the AArch64 target to test these new combiner rules, as well as updates AMDGPU GISel tests.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87668

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/combine-mul.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/sdiv.i64.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/srem.i64.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/udiv.i64.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/urem.i64.ll

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