Missing 256-bit vpermps ?

[HadrienG2]

So, I was looking through the shuffles multiple time, and I did not find an equivalent of the _mm256_permutevar8x32_ps Intel intrinsic, which maps into the vpermps hardware instruction.

According to your naming convention, I think it should be called shuffle_av_f32_all_m256.

[Lokathor]

Not sure how I missed this one, but sure I'd take a PR for this.

[HadrienG2]

Ah, after looking through the source code, it's actually there, but incorrectly named shuffle_av_i32_all_m256.

So another candidate for naming convention cleanup.