[all-commits] [llvm/llvm-project] b33c06: InstCombine: Fold known-qnan results to a literal nan

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/instcombine/simplify-demanded-fpclass-allow-fold-to-qnan
  Home:   https://github.com/llvm/llvm-project
  Commit: b33c06f4e76b328a2fc3e42c9a13f51abf113c6d
      https://github.com/llvm/llvm-project/commit/b33c06f4e76b328a2fc3e42c9a13f51abf113c6d
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-01-15 (Thu, 15 Jan 2026)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-exp.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-extractelement.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-fadd.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-fmul.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-fpext.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-fptrunc-round.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-fptrunc.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-frexp.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-insertelement.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-maximum.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-maximumnum.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-minimum.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-minimumnum.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-rounding-intrinsics.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-shufflevector.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass-sqrt.ll
    M llvm/test/Transforms/InstCombine/simplify-demanded-fpclass.ll

  Log Message:
  -----------
  InstCombine: Fold known-qnan results to a literal nan

Previously we only considered fcNan to fold to qnan for canonicalizing
results, ignoring the simpler case where we know the nan is already
quiet.



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