[all-commits] [llvm/llvm-project] cbb047: [InstCombine] Fold fneg over select (#89947)

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cbb0477e9a8d1e695d10a7e263d5e26757114f70
      https://github.com/llvm/llvm-project/commit/cbb0477e9a8d1e695d10a7e263d5e26757114f70
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-04-25 (Thu, 25 Apr 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
    M llvm/test/Transforms/InstCombine/fneg.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass.ll

  Log Message:
  -----------
  [InstCombine] Fold fneg over select (#89947)

As we folds fabs over select in
https://github.com/llvm/llvm-project/pull/86390, this patch folds fneg
over select to make sure nabs idioms are generated.
Addresses
https://github.com/llvm/llvm-project/pull/86390#discussion_r1568862289.

Alive2 for FMF propagation: https://alive2.llvm.org/ce/z/-h6Vuo



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