#2015: thorn Vectors does not provide a sum() reduction -------------------------+-------------------------------------------------- Reporter: rhaas | Owner: Type: enhancement | Status: new Priority: minor | Milestone: Component: Cactus | Version: development version Keywords: Vectors | -------------------------+-------------------------------------------------- It would be very useful for some applications (eg interpolation) if thorn Vectors provided a sum() function similar to the sum() member of vecmathlib
https://bitbucket.org/eschnett/vecmathlib/src/477f9c85cf111e59a9042f230bb536... =file-view-default#vec_avx_double4.h-537 {{{ real_t sum() const { // return (*this)[0] + (*this)[1] + (*this)[2] + (*this)[3]; // __m256d x = _mm256_hadd_pd(v, v); // __m128d xlo = _mm256_extractf128_pd(x, 0); // __m128d xhi = _mm256_extractf128_pd(x, 1); realvec_t x = *this; x = _mm256_hadd_pd(x.v, x.v); return x[0] + x[2]; } }}}
Most likely one can just copy and paste the code from vecmathlib. vecmathlib's license is not LGPL but permissive enough for inclusion and we can also ask Erik if one can use it and change the license of the affected code lines to LGPL in Cactus, the license is here:
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