https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107304

--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
Since this type

typedef struct {
    unsigned char v __attribute__((aligned(256))) __attribute__
((vector_size(64 * sizeof(unsigned char))));
} stress_vec_u8_64_t;

is processed outside of the function and AVX512 is enabled by default, it
has V64QImode instead of BLKmode.  If the target attribute disables AVX512,
V64QImode becomes unusable.

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