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nir/algebraic: optimize bitfield_select(a, b, 0) to iand(a, b)

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(src0 & src1) | (~src0 & src2) to (src0 & src1).

fossils-db (Polaris10):
Totals from 873 (0.63% of 138014) affected shaders:
SGPRs: 33781 -> 33733 (-0.14%)
VGPRs: 37704 -> 37520 (-0.49%); split: -0.51%, +0.02%
CodeSize: 3861460 -> 3853424 (-0.21%); split: -0.21%, +0.00%
MaxWaves: 5306 -> 5305 (-0.02%)
Instrs: 743798 -> 743486 (-0.04%); split: -0.04%, +0.00%
Cycles: 10962244 -> 10960936 (-0.01%); split: -0.01%, +0.00%
VMEM: 128309 -> 128350 (+0.03%); split: +0.33%, -0.30%
SMEM: 44797 -> 44113 (-1.53%); split: +0.02%, -1.54%
Copies: 71875 -> 71674 (-0.28%); split: -0.31%, +0.03%
PreSGPRs: 23484 -> 23479 (-0.02%)
PreVGPRs: 34582 -> 34529 (-0.15%)

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7479>
This commit is contained in:
Samuel Pitoiset
2020-11-06 16:43:41 +01:00
committed by Marge Bot
parent d47969eb5e
commit 1c5271346a
1 changed files with 3 additions and 0 deletions
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3
src/compiler/nir/nir_opt_algebraic.py
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@@ -1399,6 +1399,9 @@ optimizations.extend([
('ubfe', 'value', 'offset', 'bits')),
'options->lower_bitfield_extract'),
# (src0 & src1) | (~src0 & src2). Constant fold if src2 is 0.
(('bitfield_select', a, b, 0), ('iand', a, b)),
# Note that these opcodes are defined to only use the five least significant bits of 'offset' and 'bits'
(('ubfe', 'value', 'offset', ('iand', 31, 'bits')), ('ubfe', 'value', 'offset', 'bits')),
(('ubfe', 'value', ('iand', 31, 'offset'), 'bits'), ('ubfe', 'value', 'offset', 'bits')),