Hello!
I have a hot inner loop which was vectorized by gcc, but I also want
compiler to unroll this loop by some factor.
It can be controled in clang with this pragma:
#pragma clang loop vectorize(enable) vectorize_width(8)
Please see example here:
https://godbolt.org/g/UJoUJn
So I want to tell gcc something like this:
"I want you to vectorize the loop. After that I want you to unroll
this vectorized loop by some defined factor."
I was playing with #pragma omp simd with the safelen clause, and
#pragma GCC optimize("unroll-loops") with no success. Compiler option
-fmax-unroll-times is not suitable for me, because it will affect
other parts of the code.
Is it possible to achieve this somehow?
--
Best regards,
Denis.
