[all-commits] [llvm/llvm-project] ec4adf: [InstCombine] Combine instructions of type or/and ...

[bipmis via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ec4adf1f6c333d3d36663d8f763c0896407f1b61
      https://github.com/llvm/llvm-project/commit/ec4adf1f6c333d3d36663d8f763c0896407f1b61
  Author: Biplob Mishra <biplob.mishra at arm.com>
  Date:   2022-05-16 (Mon, 16 May 2022)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
    M llvm/test/Transforms/InstCombine/and-or.ll
    M llvm/test/Transforms/InstCombine/or.ll

  Log Message:
  -----------
  [InstCombine] Combine instructions of type or/and where AND masks can be combined.

The patch simplifies some of the patterns as below

(A | (B & C0)) | (B & C1) -> A | (B & C0|C1)
((B & C0) | A) | (B & C1) -> (B & C0|C1) | A

In some scenarios like byte reverse on half word, we can see this pattern multiple times and this conversion can optimize these patterns.

Differential Revision: https://reviews.llvm.org/D124119