[Bug tree-optimization/54525] Recognize (vec_)cond_expr in mask operation

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54525

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> 2012-09-15 08:28:08 UTC ---
(In reply to comment #0)
>     vpcmpgtq    %xmm2, %xmm3, %xmm2
>     vpcmpeqd    %xmm3, %xmm3, %xmm3
[...]
> (also notice that for some reason all comparisons (I tried < <= > >= and even
> with a ~ in front) generate a combination of gt and eq, never just gt)

Hmm, that remark was nonsense, the eq has nothing to do with the gt, it is just
the way the compiler generates a constant -1 vector so it can then xor with it
to compute a ~.