[Mesa-dev] [PATCH] Integrate precise trig into configuration infrastructure

Matt Turner mattst88 at gmail.com
Thu May 12 17:11:16 UTC 2016

On Thu, May 12, 2016 at 4:49 AM, Eero Tamminen
<eero.t.tamminen at intel.com> wrote:
> Multiply is faster instruction than sin/cos, and depending on what else the
> shader does, good scheduler may be able to hide latency of additional
> multiply, so I don't think it's quite that bad. :-)

I think you misunderstood what was happening in the program that was
hurt by this. It wasn't scheduling that was able to hide the
additional latency. Every sin/cos in the program was multiplied by a
constant, so Ken moved the workaround to NIR which allowed the two
constants to be combined, removing the additional multiply.

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