On Tue, Nov 10, 2015 at 2:02 PM, Ilya Enkovich <enkovich....@gmail.com> wrote: > 2015-11-10 15:30 GMT+03:00 Richard Biener <richard.guent...@gmail.com>: >> On Tue, Nov 3, 2015 at 1:08 PM, Yuri Rumyantsev <ysrum...@gmail.com> wrote: >>> Richard, >>> >>> It looks like misunderstanding - we assume that for GCCv6 the simple >>> scheme of remainder will be used through introducing new IV : >>> https://gcc.gnu.org/ml/gcc-patches/2015-09/msg01435.html >>> >>> Is it true or we missed something? >> >> <quote> >>> > Do you have an idea how "masking" is better be organized to be usable >>> > for both 4b and 4c? >>> >>> Do 2a ... >> Okay. >> </quote> > > 2a was 'transform already vectorized loop as a separate > post-processing'. Isn't it what this prototype patch implements? > Current version only masks loop body which is in practice applicable > for AVX-512 only in the most cases. With AVX-512 it's easier to see > how profitable masking might be and it is a main target for the first > masking version. Extending it to prologues/epilogues and thus making > it more profitable for other targets is the next step and is out of > the scope of this patch.
Ok, technically the prototype transforms the already vectorized loop. Of course I meant the vectorized loop be copied, masked and that result used as epilogue... I'll queue a more detailed look into the patch for this week. Did you perform any measurements with this patch like # of masked epilogues in SPEC 2006 FP (and any speedup?) Thanks, Richard. > Thanks, > Ilya > >> >> Richard. >>
