[Bug target/101058] [12 Regression] ICE in extract_insn, at recog.c:2770 since r12-1215-g8d7dae0eb366a88a

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101058

--- Comment #9 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #8)
> Though, when this *punpckwd define_insn_and_split handles all possible
> constant permutations for V2HImode, shouldn't ix86_vectorize_vec_perm_const
> say so:
>      case E_V2HImode:
>        if (!TARGET_SSE2)
>          return false;
> +      /* All implementable with *punpckwd.  */
> +      if (d.testing_p)
> +        return true;
>        break;
> ?

Yes, we can add this optimization. V2HImode is actually mentioned a couple of
lines below, where it is claimed that it is fully implementable for one
operand.