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authorIan Romanick <[email protected]>2020-03-02 18:38:11 -0800
committerMarge Bot <[email protected]>2020-03-18 20:36:29 +0000
commit7673dcbd21150e67c5a36bdcc3eee419c025604b (patch)
tree5a2bc0a91c9ddce94a63a34843e47a2d7761be9b /.gitlab-ci/tracie/tests/traces.yml
parentb421c0466d6ec28824b297d0545fca537c13a2b7 (diff)
soft-fp64/fsat: Correctly handle NaN
fsat is defined as min(max(a, 0.0), 1.0), and IEEE defines both min and max to return the non-NaN value when one value is NaN. Based on this, fsat should definitely return 0.0 for NaN. Results on the 308 shaders extracted from the fp64 portion of the OpenGL CTS: Tiger Lake and Ice Lake had similar results. (Tiger Lake shown) total instructions in shared programs: 841666 -> 841647 (<.01%) instructions in affected programs: 122033 -> 122014 (-0.02%) helped: 7 HURT: 0 helped stats (abs) min: 1 max: 4 x̄: 2.71 x̃: 3 helped stats (rel) min: 0.01% max: 0.02% x̄: 0.02% x̃: 0.01% 95% mean confidence interval for instructions value: -3.74 -1.69 95% mean confidence interval for instructions %-change: -0.02% -0.01% Instructions are helped. total cycles in shared programs: 6927246 -> 6926904 (<.01%) cycles in affected programs: 1038987 -> 1038645 (-0.03%) helped: 7 HURT: 0 helped stats (abs) min: 18 max: 72 x̄: 48.86 x̃: 54 helped stats (rel) min: 0.03% max: 0.05% x̄: 0.03% x̃: 0.03% 95% mean confidence interval for cycles value: -67.38 -30.33 95% mean confidence interval for cycles %-change: -0.05% -0.02% Cycles are helped. Reviewed-by: Jason Ekstrand <[email protected]> Reviewed-by: Matt Turner <[email protected]> Fixes: a42163cbbc1 ("compiler: Add lowering support for 64-bit saturate operations to software") Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2585 Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>
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