[all-commits] [llvm/llvm-project] 431e93: [InstCombine] Fold sub(add(x, y), min/max(x, y)) -> m...

Simon Pilgrim via All-commits all-commits at lists.llvm.org
Mon Apr 11 03:33:14 PDT 2022

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 431e93f4f56e5b839bf1f746d65139ccf3ca2232
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-04-11 (Mon, 11 Apr 2022)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
    M llvm/test/Transforms/InstCombine/sub-minmax.ll
    M llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll

  Log Message:
  [InstCombine] Fold sub(add(x,y),min/max(x,y)) -> max/min(x,y) (PR38280)

As discussed on Issue #37628, we can flip a min/max node if we're subtracting from the sum of the node's operands

Alive2: https://alive2.llvm.org/ce/z/W_KXfy

Differential Revision: https://reviews.llvm.org/D123399

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