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nir/algebraic: Optimize some bfe patterns 

v2: Use -x instead of 32-x in shift counts.

Tiger Lake
total instructions in shared programs: 17597691 -> 17597405 (<.01%)
instructions in affected programs: 224557 -> 224271 (-0.13%)
helped: 74
HURT: 17
helped stats (abs) min: 1 max: 71 x̄: 14.36 x̃: 7
helped stats (rel) min: 0.08% max: 1.80% x̄: 0.50% x̃: 0.37%
HURT stats (abs)   min: 1 max: 141 x̄: 45.71 x̃: 40
HURT stats (rel)   min: 0.03% max: 3.55% x̄: 1.20% x̃: 1.14%
95% mean confidence interval for instructions value: -10.53 4.24
95% mean confidence interval for instructions %-change: -0.38% 0.01%
Inconclusive result (value mean confidence interval includes 0).

total cycles in shared programs: 333595656 -> 333180770 (-0.12%)
cycles in affected programs: 70056467 -> 69641581 (-0.59%)
helped: 91
HURT: 4
helped stats (abs) min: 1 max: 25174 x̄: 4571.40 x̃: 400
helped stats (rel) min: <.01% max: 2.23% x̄: 0.40% x̃: 0.21%
HURT stats (abs)   min: 1 max: 370 x̄: 277.75 x̃: 370
HURT stats (rel)   min: 0.01% max: 0.04% x̄: 0.04% x̃: 0.04%
95% mean confidence interval for cycles value: -5981.55 -2752.89
95% mean confidence interval for cycles %-change: -0.48% -0.29%
Cycles are helped.

Ice Lake, Skylake, Broadwell, and Haswell had similar results. (Ice Lake shown)
total instructions in shared programs: 16117204 -> 16116723 (<.01%)
instructions in affected programs: 207109 -> 206628 (-0.23%)
helped: 100
HURT: 0
helped stats (abs) min: 1 max: 9 x̄: 4.81 x̃: 7
helped stats (rel) min: 0.10% max: 1.58% x̄: 0.23% x̃: 0.20%
95% mean confidence interval for instructions value: -5.51 -4.11
95% mean confidence interval for instructions %-change: -0.27% -0.19%
Instructions are helped.

total cycles in shared programs: 330487341 -> 330082421 (-0.12%)
cycles in affected programs: 68037050 -> 67632130 (-0.60%)
helped: 89
HURT: 7
helped stats (abs) min: 2 max: 24610 x̄: 4567.07 x̃: 400
helped stats (rel) min: <.01% max: 1.52% x̄: 0.39% x̃: 0.22%
HURT stats (abs)   min: 1 max: 370 x̄: 221.29 x̃: 170
HURT stats (rel)   min: 0.01% max: 1.66% x̄: 0.58% x̃: 0.04%
95% mean confidence interval for cycles value: -5780.79 -2655.05
95% mean confidence interval for cycles %-change: -0.42% -0.22%
Cycles are helped.

Ivy Bridge
total instructions in shared programs: 11873641 -> 11873137 (<.01%)
instructions in affected programs: 147464 -> 146960 (-0.34%)
helped: 54
HURT: 0
helped stats (abs) min: 9 max: 10 x̄: 9.33 x̃: 9
helped stats (rel) min: 0.29% max: 0.41% x̄: 0.34% x̃: 0.34%
95% mean confidence interval for instructions value: -9.46 -9.20
95% mean confidence interval for instructions %-change: -0.35% -0.33%
Instructions are helped.

total cycles in shared programs: 175769085 -> 175549519 (-0.12%)
cycles in affected programs: 60770592 -> 60551026 (-0.36%)
helped: 54
HURT: 0
helped stats (abs) min: 252 max: 13434 x̄: 4066.04 x̃: 1290
helped stats (rel) min: 0.02% max: 0.74% x̄: 0.34% x̃: 0.26%
95% mean confidence interval for cycles value: -5323.59 -2808.48
95% mean confidence interval for cycles %-change: -0.41% -0.27%
Cycles are helped.

No changes on any earlier Intel platforms.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4156>
This commit is contained in:
Ian Romanick 2020-03-05 13:32:07 -08:00
parent f46eabf84e
commit 3b6449d453
1 changed files with 18 additions and 0 deletions
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18
src/compiler/nir/nir_opt_algebraic.py
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@ -1230,6 +1230,24 @@ optimizations.extend([
(('bfm', 'bits', ('iand', 31, 'offset')), ('bfm', 'bits', 'offset')),
(('bfm', ('iand', 31, 'bits'), 'offset'), ('bfm', 'bits', 'offset')),
# Section 8.8 (Integer Functions) of the GLSL 4.60 spec says:
#
# If bits is zero, the result will be zero.
#
# These patterns prevent other patterns from generating invalid results
# when count is zero.
(('ubfe', a, b, 0), 0),
(('ibfe', a, b, 0), 0),
(('ubfe', a, 0, '#b'), ('iand', a, ('ushr', 0xffffffff, ('ineg', b)))),
(('b2i32', ('i2b', ('ubfe', a, b, 1))), ('ubfe', a, b, 1)),
(('b2i32', ('i2b', ('ibfe', a, b, 1))), ('ubfe', a, b, 1)), # ubfe in the replacement is correct
(('ine', ('ibfe(is_used_once)', a, '#b', '#c'), 0), ('ine', ('iand', a, ('ishl', ('ushr', 0xffffffff, ('ineg', c)), b)), 0)),
(('ieq', ('ibfe(is_used_once)', a, '#b', '#c'), 0), ('ieq', ('iand', a, ('ishl', ('ushr', 0xffffffff, ('ineg', c)), b)), 0)),
(('ine', ('ubfe(is_used_once)', a, '#b', '#c'), 0), ('ine', ('iand', a, ('ishl', ('ushr', 0xffffffff, ('ineg', c)), b)), 0)),
(('ieq', ('ubfe(is_used_once)', a, '#b', '#c'), 0), ('ieq', ('iand', a, ('ishl', ('ushr', 0xffffffff, ('ineg', c)), b)), 0)),
(('ibitfield_extract', 'value', 'offset', 'bits'),
('bcsel', ('ieq', 0, 'bits'),
0,