https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121392

--- Comment #1 from Andrew Stubbs <ams at gcc dot gnu.org> ---
The i386 host platform was avoiding the amdgcn backend bug by basically
disabling vectorization on arrays known to be smaller than 64 elements.  Now
that the option pass-through is removed, we're seeing previously hidden bugs
(and also improved performance where its not broken).

I'll take a look soon.

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