On Fri, Jun 05, 2020 at 01:58:55PM +0000, Feltgen, Eric wrote: > my name is Eric, I'm a german student at RWTH Aachen University currently > researching OpenMP. > > > For my research, I'm also looking at math functions provided by compilers > like GCC. When writing vectorizable code, it is important to use math > functions which also allow for vectorization. I've read that gcc includes a > set of math functions which are SIMD compatible. Where can I find resources > on them? > > > It would be awesome if you could tell me where to find documentation.
It is glibc that provides them, not GCC. See https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86/fpu/bits/math-vector.h;h=0801905da7b85e2f43fb6b682a7b84c5eec469d4;hb=HEAD for the header file and the functions are then implemented (mostly?) in assembly in e.g. /usr/src/libc/sysdeps/x86_64/fpu/ directory. There is similar support for aarch64. All that is provided by GCC is -fopenmp #pragma omp declare simd support and support for corresponding simd attribute (which is what is used if -fopenmp is not enabled). Jakub
