[all-commits] [llvm/llvm-project] 64b267: [InstCombine] fold ctlz/cttz-of-select with 1 or m...

[RotateRight via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 64b2676ca8290c7ff971c6f5b7a355b0ae7693de
      https://github.com/llvm/llvm-project/commit/64b2676ca8290c7ff971c6f5b7a355b0ae7693de
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2021-06-21 (Mon, 21 Jun 2021)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
    M llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
    M llvm/test/Transforms/InstCombine/intrinsic-select.ll

  Log Message:
  -----------
  [InstCombine] fold ctlz/cttz-of-select with 1 or more constant arms

Building on:
4c44b02d87
...and adding handling for the extra operand in these intrinsics.

This pattern is discussed in:
https://llvm.org/PR50140