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authorIlia Mirkin <[email protected]>2016-03-12 21:26:21 -0500
committerIlia Mirkin <[email protected]>2016-03-13 13:17:24 -0400
commitc1e4a6bfbf015801c6a8b0ae694482421a22c2d9 (patch)
tree207eccde3645c53393c2d174f24fb3e381ae5fab /bin/get-pick-list.sh
parentb3e7fb52349848b24f005c07859bc43691bd64bd (diff)
nv50,nvc0: handle SQRT lowering inside the driver
First off, st/mesa lowers DSQRT incorrectly (it uses CMP to attempt to find out whether the input is less than 0). Secondly the current approach (x * rsq(x)) behaves poorly for x = inf - a NaN is produced instead of inf. Instead we switch to the less accurate rcp(rsq(x)) method - this behaves nicely for all valid inputs. We still don't do this for DSQRT since the RSQ/RCP ops are *really* inaccurate, and don't even have Newton-Raphson steps right now. Eventually we should have a separate library function for DSQRT that does it more precisely (and perhaps move this lowering to the post-opt phase). This fixes a number of dEQP precision tests that were expecting better behavior for infinite inputs. Signed-off-by: Ilia Mirkin <[email protected]> Reviewed-by: Samuel Pitoiset <[email protected]> Tested-by: Samuel Pitoiset <[email protected]>
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