[Bug target/84201] 549.fotonik3d_r from SPEC2017 fails verification with recent Intel and AMD CPUs

[sje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84201

Steve Ellcey <sje at gcc dot gnu.org> changed:

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                 CC|                            |sje at gcc dot gnu.org

--- Comment #5 from Steve Ellcey <sje at gcc dot gnu.org> ---

Has anyone looked into this any more to see what optimization is causing this
failure?

In my testing:

-Ofast fails
-Ofast -fno-unsafe-math-optimizations works
-Ofast -fno-tree-loop-vectorize works
-O3 works

So it seems to be some combination of unsafe math optimizations and
vectorization that is causing the failure.