On 15 February 2014 19:26, Jakub Jelinek <ja...@redhat.com> wrote: > GCC supports #pragma GCC ivdep/#pragma simd/#pragma omp simd, the last one > can be used without rest of OpenMP by using -fopenmp-simd switch.
Does the simd/omp have control over the tree vectorizer? Or are they just flags for the omp implementation? > I don't see why we would need more ways to do the same thing. Me neither! That's what I'm trying to avoid. Do you guys use those pragmas for everything related to the vectorizer? I found that the Intel pragmas (not just simd and omp) are pretty good fit to most of our needed functionality. Does GCC use Intel pragmas to control the vectorizer? Would be good to know how you guys did it, so that we can follow the same pattern. Can GCC vectorize lexical blocks as well? Or just loops? IF those pragmas can't be used in lexical blocks, would it be desired to extend that in GCC? The Intel guys are pretty happy implementing simd, omp, etc. in LLVM, and I think if the lexical block problem is common, they may even be open to extending the semantics? cheers, --renato
