[all-commits] [llvm/llvm-project] a8f13d: [InstCombine] fold shuffle of fabs

[Sanjay Patel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a8f13dbdeb31be37ee15b5febb7cc2137bbece67
      https://github.com/llvm/llvm-project/commit/a8f13dbdeb31be37ee15b5febb7cc2137bbece67
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2023-02-03 (Fri, 03 Feb 2023)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
    M llvm/test/Transforms/InstCombine/vec_shuffle.ll

  Log Message:
  -----------
  [InstCombine] fold shuffle of fabs

shuffle (fabs X), Mask --> fabs (shuffle X, Mask)
shuffle (fabs X), (fabs Y), Mask --> fabs (shuf X, Y, Mask)

https://alive2.llvm.org/ce/z/JH2nkf

This generalizes the existing fneg transforms to also work with fabs.

A likely follow-up would generalize this further to move any unary
intrinsic op.