On 13 April 2011 18:48, Richard Sandiford <richard.sandif...@linaro.org> wrote: > I've now submitted the initial vldN and vstN work, so I thought I'd see > how often it triggers for natty's libav package. I've put some initial > results here: > > https://wiki.linaro.org/RichardSandiford/Sandbox/NeonLibAv > > There are more files to go through, so this isn't complete. > I've also left out cases that were very similar to the ones given. > > Some of the code is reasonable, while others are obviously not as good > as they could be. I don't think the problems are really to do with > the vldN and vstN work itself though. They seem to be due to the > underlying interleaved load/store detection, or in the handling > of widening operations.
I'll take a closer look later, for now WRT > Another example where we use interleaving poorly. We load &buf[i], &buf[i + > 1], &buf[i + 2] and &buf[i + 3] into separate base > registers, load 4 elements from each, but only use one element. For such loads with gaps, the vectorizer indeed generates loads for every element, hoping that DCE removes it later. It seemed to work until now. Thanks, Ira > > Richard > > _______________________________________________ > linaro-toolchain mailing list > linaro-toolchain@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-toolchain > _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain
