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nir/algebraic: a & ~(a >> 31) -> imax(a, 0)

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Found in some Doom shaders

Totals from affected shaders:
SGPRS: 30056 -> 30064 (0.03 %)
VGPRS: 28024 -> 28024 (0.00 %)
Spilled SGPRs: 0 -> 0 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Code Size: 4278648 -> 4270852 (-0.18 %) bytes
Max Waves: 1476 -> 1476 (0.00 %)
Instructions: 835287 -> 833338 (-0.23 %)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3089>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3089>
This commit is contained in:
Rhys Perry 2019-12-10 16:20:56 +00:00 • committed by Marge Bot
parent 1607123ae7
commit cc3ef3643a
1 changed files with 1 additions and 0 deletions
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1
src/compiler/nir/nir_opt_algebraic.py
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@ -480,6 +480,7 @@ optimizations.extend([
(('fmin', ('fmin', a, b), b), ('fmin', a, b)),
(('umin', ('umin', a, b), b), ('umin', a, b)),
(('imin', ('imin', a, b), b), ('imin', a, b)),
(('iand@32', a, ('inot', ('ishr', a, 31))), ('imax', a, 0)),
(('fmax', a, ('fneg', a)), ('fabs', a)),
(('imax', a, ('ineg', a)), ('iabs', a)),
(('fmin', a, ('fneg', a)), ('fneg', ('fabs', a))),