[Bug middle-end/116896] codegen for <=> compared to hand-written equivalent

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116896

--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #17)
> e.g.:
> 
> float case:
>         xorl    %eax,%eax
>         comiss  %xmm1, %xmm0
>         jp      .L2
>         seta    %al
>         sbbl    $0, %eax
>         ret
> .L2:
>         movl    $2, %eax
>         ret
> 
> This is *really* good sequence!

But peephole2 can't do this (I think it works on bbs, not ebbs).  And see my
above attempt, combine screws stuff up if done during expand.