[all-commits] [llvm/llvm-project] afa192: [InstCombine] add narrowing transform for low-mask...

[Sanjay Patel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: afa192cfb6049a15c5542d132d500b910b802c74
      https://github.com/llvm/llvm-project/commit/afa192cfb6049a15c5542d132d500b910b802c74
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2022-06-09 (Thu, 09 Jun 2022)

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

  Log Message:
  -----------
  [InstCombine] add narrowing transform for low-masked binop with zext operand

https://alive2.llvm.org/ce/z/hRy3rE

As shown in D123408, we can produce this pattern when moving
cast around, and we already have a related fold for a binop
with a constant operand.