Hi Noel,
There’s a lot of Vector Libraries that wrap the usage of SSE instructions. I
used one of that libraries in a project long time a go and I could not find it.
But the performance improvement was great.
Here’s an example I found:
http://fastcpp.blogspot.com.br/2011/12/simple-vector3-class-with-sse-support.html
<http://fastcpp.blogspot.com.br/2011/12/simple-vector3-class-with-sse-support.html>
Best Regards,
Lorenzo
> On 30 Jul 2017, at 12:05, Noel Carboni <ncarb...@prodigitalsoftware.com>
> wrote:
>
> Hi Lorenzo,
>
> > Did you try Intel C++ Compiler? (It’s free for open source projects on
> > Linux).
> > In some programs I got 2:1 performance improvements.
>
> No, I haven't run that one. At the moment we have really only one practical
> choice here: The Microsoft Visual Studio 2017 C++ compiler for Windows,
> though we may be looking into alternatives in the future. I have heard good
> things about Intel's compiler elsewhere as well. Thanks for the data point.
>
> For what it's worth, looking over Microsoft compiler-generated code, with
> some of the complex routines like multi-input/output interpolation the
> compiler is starved for registers and has to resort to storing intermediate
> compute products in RAM. Just small things like changing the way loops are
> managed to free up a register here and there make a noticeable difference in
> throughput, especially with e.g., the 32 bit floating point routines, where
> the channel data is 4 bytes each and the process is already quite RAM-bound
> when multi-threaded.
>
> It's possible using SSE instructions to facilitate things like doing 4
> calculations simultaneously could speed things up further. I'm looking into
> that now.
>
> -Noel
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