https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121020

--- Comment #3 from Sam James <sjames at gcc dot gnu.org> ---
(In reply to Sam James from comment #2)
> Created attachment 61828 [details]
> genrecog.ii.xz
> 
> genrecog.o itself is miscompiled.

$ g++ -std=c++14 -c -ggdb3 -o build/genrecog.o /tmp/genrecog.ii -O2
-fno-vect-cost-model -mavx

is enough, but of course it's not standalone as a runtime testcase.

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