[all-commits] [llvm/llvm-project] 9a844a: [InstCombine] Use InstSimplify in FoldOpIntoSelect...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9a844a36eb9a21de27882b6193a82fda49986347
      https://github.com/llvm/llvm-project/commit/9a844a36eb9a21de27882b6193a82fda49986347
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2024-11-18 (Mon, 18 Nov 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
    M llvm/test/Transforms/InstCombine/cast-mul-select.ll
    M llvm/test/Transforms/InstCombine/extract-select-agg.ll
    M llvm/test/Transforms/InstCombine/fptrunc.ll
    M llvm/test/Transforms/InstCombine/known-never-nan.ll
    M llvm/test/Transforms/InstCombine/select.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/deterministic-type-shrinkage.ll

  Log Message:
  -----------
  [InstCombine] Use InstSimplify in FoldOpIntoSelect (#116073)

Instead of only trying to constant fold the select arms, try to simplify
them. This subsumes https://github.com/llvm/llvm-project/pull/115969
which implements this for extractvalue only.

This is still fairly limited in that we will usually only call
FoldOpIntoSelect in the first place if we have a constant operand. This
can be relaxed in the future if worthwhile.



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