Re: [Mesa-dev] [PATCH] r600g: Use hardware sqrt instruction

2014-07-23 Thread Tom Stellard
On Fri, Jul 18, 2014 at 12:35:24PM -0400, Alex Deucher wrote: On Fri, Jul 18, 2014 at 3:54 AM, Glenn Kennard glenn.kenn...@gmail.com wrote: Piglit quick tests including sqrt pass, no other regressions, tested on radeon 6670. --- Should be slightly more precise than the invsqrt/recip/mul

[Mesa-dev] [PATCH] r600g: Use hardware sqrt instruction

2014-07-18 Thread Glenn Kennard
Piglit quick tests including sqrt pass, no other regressions, tested on radeon 6670. --- Should be slightly more precise than the invsqrt/recip/mul combination used previously, I reckon up to about 2 bits of mantissa, and saves two instructions per sqrt emitted. It would be good if someone could

Re: [Mesa-dev] [PATCH] r600g: Use hardware sqrt instruction

2014-07-18 Thread Alex Deucher
On Fri, Jul 18, 2014 at 3:54 AM, Glenn Kennard glenn.kenn...@gmail.com wrote: Piglit quick tests including sqrt pass, no other regressions, tested on radeon 6670. --- Should be slightly more precise than the invsqrt/recip/mul combination used previously, I reckon up to about 2 bits of