[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.

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

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

--- Comment #4 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
(In reply to Hongtao Liu from comment #3)
> Looks like ix86_vect_estimate_reg_pressure doesn't work here, taking a look.

Oh, ix86_vect_estimate_reg_pressure is only for loop, BB vectorizer only use
ix86_builtin_vectorization_cost, but not add_stmt_cost/finish_cost.