> On 19. Dec 2019, at 13:55, Mariusz Pluciński <plucinski.mari...@gmail.com> > wrote: > > 2. I tried explicitly enabling auto vectorization in GCC, but it didn't > change much. Is that normal? If not, which flags should be used?
Auto vectorization is hit and miss - it can help in straightforward cases, but compilers can’t always automatically find the best code paths. > 3. If there's no other way, I may be ready to try to rewrite critical parts > of the simulator for SSE/AVX. In such case, could you give me a guideline > on how to do it correctly (with ultimate merge into master in mind)? The important parts IMHO are: * leave the scalar part intact for non-x86 architectures such as ARM * profile first, optimize second. Make sure that you understand what the bottleneck is before jumping the conclusions. SIMD helps when compute is the bottleneck, b it won’t do much if branch mispredictions or cache misses are the performance limiters. -Stefan _______________________________________________ Bf-committers mailing list Bf-committers@blender.org https://lists.blender.org/mailman/listinfo/bf-committers
