[PATCH] D134854: [DAG] Update `isKnownNeverNaN` for `FMA/FMAD`

[Pierre van Houtryve via Phabricator via llvm-commits]

Pierre-vh added a comment.

I did some tries but I can't get a DAG combine to involve FMA/FMAD in DAGISel that's affected by this change (I tried both on AArch64 and AMDGPU). Any idea of how I can write such a test and what the expected output should be?
The only combine I found involving this function only works if `-enable-no-signed-zeros-fp-math` is used


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  https://reviews.llvm.org/D134854/new/

https://reviews.llvm.org/D134854