[Bug target/82731] _mm256_set_epi8(array[offset[0]], array[offset[1]], ...) byte gather makes slow code, trying to zero-extend all the uint16_t offsets first and spilling them.

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82731

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
That's ix86_expand_vector_init_interleave which for QI inner_mode extends
to SImode, likely because it tries to work with just SSE2?