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freedreno: Improve the pi approximations in trig lowering.

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When comparing our sin/cos behavior to the closed source driver, I
noticed that we were off by a bit (or, in the case of 1/2pi, 3 bits).

Fixes:
dEQP-GLES3.functional.shaders.random.trigonometric.vertex.52
dEQP-GLES3.functional.shaders.random.all_features.vertex.0

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Eric Anholt 2019-06-03 16:12:14 -07:00
parent ff63b99531
commit fb872748ec
1 changed files with 2 additions and 2 deletions
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4
src/freedreno/ir3/ir3_nir_trig.py
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@ -26,8 +26,8 @@ import argparse
import sys
trig_workarounds = [
(('fsin', 'x'), ('fsin', ('fsub', ('fmul', 6.283185, ('ffract', ('fadd', ('fmul', 0.159155, 'x'), 0.5))), 3.141593))),
(('fcos', 'x'), ('fcos', ('fsub', ('fmul', 6.283185, ('ffract', ('fadd', ('fmul', 0.159155, 'x'), 0.5))), 3.141593))),
(('fsin', 'x'), ('fsin', ('fsub', ('fmul', 6.2831853, ('ffract', ('fadd', ('fmul', 0.15915494, 'x'), 0.5))), 3.14159265))),
(('fcos', 'x'), ('fcos', ('fsub', ('fmul', 6.2831853, ('ffract', ('fadd', ('fmul', 0.15915494, 'x'), 0.5))), 3.14159265))),
]