[PATCH] D90952: [GlobalISel] Add combine for (x | mask) -> x when (x | mask) == x

[Mirko Brkusanin via Phabricator via llvm-commits]

mbrkusanin created this revision.
mbrkusanin added reviewers: arsenm, foad.
mbrkusanin added a project: LLVM.
Herald added subscribers: kerbowa, hiraditya, rovka, nhaehnle, jvesely.
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Herald added a subscriber: wdng.

If we have a mask, and a value x, where (x | mask) == x, we can drop the OR
and just use x.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D90952

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/AMDGPU/GlobalISel/combine-or-redundant.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-shift-of-shifted-logic.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/sdiv.i64.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/srem.i64.ll

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