[all-commits] [llvm/llvm-project] ae2104: [SelectionDAG] Fix NaN regression in fma dag-combi...

[James Y Knight via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ae2104897c7d9f887c415b07fb2662486082b248
      https://github.com/llvm/llvm-project/commit/ae2104897c7d9f887c415b07fb2662486082b248
  Author: James Y Knight <jyknight at google.com>
  Date:   2025-07-01 (Tue, 01 Jul 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/dag-combiner-fma-folding.ll

  Log Message:
  -----------
  [SelectionDAG] Fix NaN regression in fma dag-combine. (#146592)

After 901e1390c9778a191256335d37802bc631c2d183 (#127770), the DAG
combine would transform `fma(x, 0.0, 1.0)` into `1.0` if
`-fp-contract=fast` was enabled, in addition to when 'x' is marked
nnan/ninf.

It's only valid in the latter case, not the former, so delete the extra
condition.



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