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docs: document INTEL_PRECISE_TRIG envvar

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v2: use more generic description (Jordan)

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
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Juan A. Suarez Romero 2017-01-11 18:51:35 +01:00
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docs/envvars.html
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@ -187,6 +187,8 @@ See the <a href="xlibdriver.html">Xlib software driver page</a> for details.
<li>do32 - generate compute shader SIMD32 programs even if workgroup size doesn't exceed the SIMD16 limit</li>
<li>norbc - disable single sampled render buffer compression</li>
</ul>
<li>INTEL_PRECISE_TRIG - if set to 1, true or yes, then the driver prefers
accuracy over performance in trig functions.</li>
</ul>