This is the mail archive of the
libstdc++@gcc.gnu.org
mailing list for the libstdc++ project.
Re: [PATCH] normal_distribution<double> performance improvement with SSE
On Wed, Sep 26, 2012 at 7:32 AM, Jakub Jelinek <jakub@redhat.com> wrote:
> Have you considered also an __AVX__ version handling 4 elements at a time?
> Without __AVX2__ one would need to cast __m256i to __m256d for and/or, as
> AVX1 doesn't have _mm256_and_si256 or _mm256_or_si256, but _mm256_and_pd
> or _mm256_or_pd could be used instead.
One step to do first. Currently the random number engine interface is
inefficient since it returns a single number. What we need is an
additional interface to return vectors. I'd love to use the gcc
vector extensions. For engines like sfmt this is natural. There are
a few issues with C++ support for the vector extensions. Operations
available in C are not supported in C++ yet.