[Bug target/84201] 549.fotonik3d_r from SPEC2017 fails verification with -mprefer-vector-width=256 or 512 on Zen

[marxin at gcc dot gnu.org]

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

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
If I'm correct it's also problematic on Haswell with -march=native.
Particularly the only affected file is power.fppized.o.
I also tried -mno-fma4 and -mno-fma and it does not help. From the assembly
diff, there is additional vectorization happening.