On Sun, Apr 26, 2020 at 5:25 PM Dave Love <loveshack@xxxxxxxxxxxxxxxxx> wrote:
Kevin Kofler <kevin.kofler@xxxxxxxxx> writes:
> Has anyone (upstream or elsewhere) ever looked into doing an SSE2 version of
> the vector code? It should be faster than scalar (especially considering
> that the "scalar" floating-point code (under the default -mfpmath=sse)
> actually loads everything into SSE2 registers as well, but does not actually
> make use of the vectorization) and it would match the baseline of many
> distributions and upstreams out there.
What's preventing vectorization with sse2 (or other architecture' base
SIMD) anyhow, if anything? Use something
like
gcc -Ofast -fopt-info-vec-missed
I can't comment on the exact command line used, but I did experiment with a recent pull request adding SSE 4.1
Full details here:
Thanks,
Richard
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