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

Eero Tamminen eero.t.tamminen at intel.com
Thu May 12 18:08:24 UTC 2016


On 12.05.2016 20:11, Matt Turner wrote:
> 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.

My comment was for the shaders where that is NOT the case.

	- Eero

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