On Tue, Nov 10, 2015 at 1:48 PM, Ilya Enkovich <enkovich....@gmail.com> wrote: > 2015-11-10 15:33 GMT+03:00 Richard Biener <richard.guent...@gmail.com>: >> On Fri, Nov 6, 2015 at 2:28 PM, Yuri Rumyantsev <ysrum...@gmail.com> wrote: >>> Richard, >>> >>> I tried it but 256-bit precision integer type is not yet supported. >> >> What's the symptom? The compare cannot be expanded? Just add a pattern >> then. >> After all we have modes up to XImode. > > I suppose problem may be in: > > gcc/config/i386/i386-modes.def:#define MAX_BITSIZE_MODE_ANY_INT (128) > > which doesn't allow to create constants of bigger size. Changing it > to maximum vector size (512) would mean we increase wide_int structure > size significantly. New patterns are probably also needed.
Yes, new patterns are needed but wide-int should be fine (we only need to create a literal zero AFACS). The "new pattern" would be equality/inequality against zero compares only. Richard. > Ilya > >> >> Richard. >> >>> Yuri. >>> >>>
