On Tue, May 29, 2018 at 5:24 PM Allan Sandfeld Jensen <li...@carewolf.com> wrote:
> On Dienstag, 29. Mai 2018 16:57:56 CEST Richard Biener wrote: > > > > so the situation improves but isn't fully fixed (STLF issues maybe?) > > > That raises the question if it helps in these cases even in -O3? That's a good question indeed. We might end up (partly) BB vectorizing loop bodies that we'd otherwise loop vectorize with SLP. Benchmarking with BB vectorization disabled at -O3+ isn't something I've done in the past. I'm now doing a 2-run with -march=haswell -Ofast [-fno-tree-slp-vectorize] for the FP benchmarks. Note that there were some cases where disabling vectorization wholly improved things. > Anyway it doesn't look good for it. Did the binary size at least improve with > prefer-avx128, or was that also worse or insignificant? Similar to the AVX258 results. I guess where AVX256 applied we now simply do two vector ops with AVX128. Richard. > 'Allan
