[all-commits] [llvm/llvm-project] fd90f5: [InstCombine] improve efficiency of sub demanded b...

[Sanjay Patel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fd90f542cf60c2a4e735f35513268c052686dbd6
      https://github.com/llvm/llvm-project/commit/fd90f542cf60c2a4e735f35513268c052686dbd6
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2022-10-27 (Thu, 27 Oct 2022)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp

  Log Message:
  -----------
  [InstCombine] improve efficiency of sub demanded bits; NFC

There's no reason to shrink a constant or simplify
an operand in 2 steps.

This matches what we currently do for 'add' (although that
seems like it should be altered to handle the commutative
case).