[all-commits] [llvm/llvm-project] 4c8c10: [InstCombine] try to narrow more shifted bswap-of-...

[ZCBing via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4c8c101b496431c468825518e9bd4375e8209ae9
      https://github.com/llvm/llvm-project/commit/4c8c101b496431c468825518e9bd4375e8209ae9
  Author: Chenbing Zheng <Chenbing.Zheng at streamcomputing.com>
  Date:   2022-05-06 (Fri, 06 May 2022)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp
    M llvm/test/Transforms/InstCombine/lshr.ll

  Log Message:
  -----------
  [InstCombine] try to narrow more shifted bswap-of-zext

Try to narrow more bswap, if the shift amount is less than the zext
(bswap (zext X)) >> C --> (zext (bswap X)) << C'

https://alive2.llvm.org/ce/z/i7ddjn

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D124598