> Why? SSSE3 *really can* do arbitrary permutation. If you say that > isn't enough, then there's something wrong in the back end, and all > you're doing is papering over a bug. Yes, sure, SSSE3 is enough for that. I checked for AVX in vect_perm just because there is no check for SSSE3 and no tests currently require exactly SSSE3 (without AVX) - that's not absolutely correct and I suggest it as a temporary solution - we can weaken this check when a real case will be met (in which SSSE3 is needed without AVX).
On 16 December 2011 20:42, Richard Henderson <r...@redhat.com> wrote: > On 12/15/2011 11:21 PM, Michael Zolotukhin wrote: >> E.g., in vect-114.c we need permutation only for reversing vector >> elements, even ssse3 isn't required for it ... > > Sure. > >> while in slp-perm-9 such permutation isn't enough. > > Why? SSSE3 *really can* do arbitrary permutation. If you say that > isn't enough, then there's something wrong in the back end, and all > you're doing is papering over a bug. > > Changing vect_perm to require AVX is wrong. > > > r~ -- --- Best regards, Michael V. Zolotukhin, Software Engineer Intel Corporation.
