nir: Rearrange and-compounded float compares

Graphics / Mesa 3D Graphics Library / Mesa - Ian Romanick [intel.com] - 30 January 2018 23:40 EST

If both comparisons are used as sources for instructions other than the iand, this transformation is detrimental. If the non-identical value in both compares is constant, the fmin or fmax will be constant-folded away, so the transformation is always a win.

It is interesting to me that on Iron Lake only 81 shaders have instruction counts changed, but 726 shaders have cycle counts changed.

shader-db results:

Skylake total instructions in shared programs: 14525728 -> 14521017 (-0.03%) instructions in affected programs: 1164726 -> 1160015 (-0.40%) helped: 1692 HURT: 5 helped stats (abs) min: 1 max: 637 x̄: 2.79 x̃: 2 helped stats (rel) min: 0.07% max: 16.36% x̄: 0.81% x̃: 0.33% HURT stats (abs) min: 1 max: 12 x̄: 3.20 x̃: 1 HURT stats (rel) min: 0.38% max: 2.86% x̄: 2.36% x̃: 2.86% 95% mean confidence interval for instructions value: -3.52 -2.03 95% mean confidence interval for instructions %-change: -0.86% -0.74% Instructions are helped.

total cycles in shared programs: 533115449 -> 532991404 (-0.02%) cycles in affected programs: 119401803 -> 119277758 (-0.10%) helped: 1145 HURT: 467 helped stats (abs) min: 1 max: 34644 x̄: 145.92 x̃: 18 helped stats (rel) min: <.01% max: 45.33% x̄: 1.58% x̃: 0.42% HURT stats (abs) min: 1 max: 1590 x̄: 92.15 x̃: 15 HURT stats (rel) min: <.01% max: 13.48% x̄: 1.26% x̃: 0.39% 95% mean confidence interval for cycles value: -122.16 -31.74 95% mean confidence interval for cycles %-change: -0.94% -0.57% Cycles are helped.

total spills in shared programs: 9597 -> 9534 (-0.66%) spills in affected programs: 403 -> 340 (-15.63%) helped: 1 HURT: 1

total fills in shared programs: 13904 -> 13790 (-0.82%) fills in affected programs: 1627 -> 1513 (-7.01%) helped: 2 HURT: 1

LOST: 0 GAINED: 2

Broadwell total instructions in shared programs: 14816966 -> 14812590 (-0.03%) instructions in affected programs: 1499885 -> 1495509 (-0.29%) helped: 1672 HURT: 15 helped stats (abs) min: 1 max: 455 x̄: 2.70 x̃: 2 helped stats (rel) min: 0.05% max: 16.36% x̄: 0.81% x̃: 0.33% HURT stats (abs) min: 1 max: 21 x̄: 9.20 x̃: 8 HURT stats (rel) min: 0.08% max: 2.86% x̄: 1.06% x̃: 0.53% 95% mean confidence interval for instructions value: -3.14 -2.05 95% mean confidence interval for instructions %-change: -0.85% -0.73% Instructions are helped.

total cycles in shared programs: 559353622 -> 559345595 (<.01%) cycles in affected programs: 139893703 -> 139885676 (<.01%) helped: 921 HURT: 697 helped stats (abs) min: 1 max: 42424 x̄: 143.45 x̃: 18 helped stats (rel) min: <.01% max: 36.23% x̄: 2.02% x̃: 0.87% HURT stats (abs) min: 1 max: 2370 x̄: 178.03 x̃: 38 HURT stats (rel) min: <.01% max: 17.35% x̄: 0.71% x̃: 0.14% 95% mean confidence interval for cycles value: -59.64 49.72 95% mean confidence interval for cycles %-change: -1.02% -0.66% Inconclusive result (value mean confidence interval includes 0).

total spills in shared programs: 78902 -> 78861 (-0.05%) spills in affected programs: 2418 -> 2377 (-1.70%) helped: 1 HURT: 11

total fills in shared programs: 83782 -> 83678 (-0.12%) fills in affected programs: 3515 -> 3411 (-2.96%) helped: 2 HURT: 11

LOST: 0 GAINED: 5

Haswell and Ivy Bridge had similar results. Haswell shown. total instructions in shared programs: 9033898 -> 9032010 (-0.02%) instructions in affected programs: 308064 -> 306176 (-0.61%) helped: 921 HURT: 4 helped stats (abs) min: 1 max: 20 x̄: 2.05 x̃: 1 helped stats (rel) min: 0.17% max: 17.54% x̄: 0.80% x̃: 0.35% HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1 HURT stats (rel) min: 3.23% max: 3.23% x̄: 3.23% x̃: 3.23% 95% mean confidence interval for instructions value: -2.21 -1.87 95% mean confidence interval for instructions %-change: -0.88% -0.68% Instructions are helped.

total cycles in shared programs: 84628949 -> 84620520 (<.01%) cycles in affected programs: 2164913 -> 2156484 (-0.39%) helped: 518 HURT: 359 helped stats (abs) min: 1 max: 440 x̄: 41.52 x̃: 20 helped stats (rel) min: <.01% max: 17.17% x̄: 1.95% x̃: 1.01% HURT stats (abs) min: 1 max: 586 x̄: 36.43 x̃: 8 HURT stats (rel) min: 0.04% max: 18.65% x̄: 1.47% x̃: 0.40% 95% mean confidence interval for cycles value: -15.17 -4.05 95% mean confidence interval for cycles %-change: -0.77% -0.32% Cycles are helped.

LOST: 0 GAINED: 4

Sandy Bridge total instructions in shared programs: 10544860 -> 10542933 (-0.02%) instructions in affected programs: 360019 -> 358092 (-0.54%) helped: 931 HURT: 4 helped stats (abs) min: 1 max: 20 x̄: 2.07 x̃: 1 helped stats (rel) min: 0.11% max: 15.52% x̄: 0.68% x̃: 0.30% HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1 HURT stats (rel) min: 3.33% max: 3.33% x̄: 3.33% x̃: 3.33% 95% mean confidence interval for instructions value: -2.23 -1.89 95% mean confidence interval for instructions %-change: -0.76% -0.58% Instructions are helped.

total cycles in shared programs: 146106820 -> 146098397 (<.01%) cycles in affected programs: 3435047 -> 3426624 (-0.25%) helped: 572 HURT: 329 helped stats (abs) min: 1 max: 1289 x̄: 32.52 x̃: 15 helped stats (rel) min: <.01% max: 26.29% x̄: 0.97% x̃: 0.33% HURT stats (abs) min: 1 max: 1714 x̄: 30.93 x̃: 6 HURT stats (rel) min: 0.02% max: 41.31% x̄: 1.13% x̃: 0.19% 95% mean confidence interval for cycles value: -16.85 -1.85 95% mean confidence interval for cycles %-change: -0.39% -0.01% Cycles are helped.

LOST: 1 GAINED: 0

Iron Lake total instructions in shared programs: 7886925 -> 7886711 (<.01%) instructions in affected programs: 25763 -> 25549 (-0.83%) helped: 75 HURT: 6 helped stats (abs) min: 1 max: 13 x̄: 3.33 x̃: 1 helped stats (rel) min: 0.35% max: 17.57% x̄: 1.96% x̃: 0.53% HURT stats (abs) min: 1 max: 16 x̄: 6.00 x̃: 1 HURT stats (rel) min: 2.86% max: 4.79% x̄: 3.49% x̃: 2.86% 95% mean confidence interval for instructions value: -3.69 -1.60 95% mean confidence interval for instructions %-change: -2.54% -0.57% Instructions are helped.

total cycles in shared programs: 178116888 -> 178115324 (<.01%) cycles in affected programs: 5858790 -> 5857226 (-0.03%) helped: 484 HURT: 242 helped stats (abs) min: 2 max: 76 x̄: 5.27 x̃: 6 helped stats (rel) min: 0.01% max: 10.70% x̄: 0.18% x̃: 0.06% HURT stats (abs) min: 2 max: 76 x̄: 4.07 x̃: 2 HURT stats (rel) min: 0.01% max: 3.99% x̄: 0.19% x̃: 0.03% 95% mean confidence interval for cycles value: -2.76 -1.55 95% mean confidence interval for cycles %-change: -0.12% 0.01% Inconclusive result (%-change mean confidence interval includes 0).

GM45 total instructions in shared programs: 4857870 -> 4857762 (<.01%) instructions in affected programs: 13994 -> 13886 (-0.77%) helped: 39 HURT: 5 helped stats (abs) min: 1 max: 13 x̄: 3.28 x̃: 2 helped stats (rel) min: 0.33% max: 17.11% x̄: 1.86% x̃: 0.48% HURT stats (abs) min: 1 max: 16 x̄: 4.00 x̃: 1 HURT stats (rel) min: 2.86% max: 4.71% x̄: 3.23% x̃: 2.86% 95% mean confidence interval for instructions value: -3.86 -1.05 95% mean confidence interval for instructions %-change: -2.61% 0.04% Inconclusive result (%-change mean confidence interval includes 0).

total cycles in shared programs: 122180744 -> 122179674 (<.01%) cycles in affected programs: 3686646 -> 3685576 (-0.03%) helped: 273 HURT: 141 helped stats (abs) min: 2 max: 76 x̄: 5.81 x̃: 6 helped stats (rel) min: 0.01% max: 10.70% x̄: 0.18% x̃: 0.06% HURT stats (abs) min: 2 max: 76 x̄: 3.66 x̃: 2 HURT stats (rel) min: 0.01% max: 3.99% x̄: 0.16% x̃: 0.02% 95% mean confidence interval for cycles value: -3.42 -1.75 95% mean confidence interval for cycles %-change: -0.15% 0.03% Inconclusive result (%-change mean confidence interval includes 0).

053be9f020 nir: Rearrange and-compounded float compares
src/compiler/nir/nir_opt_algebraic.py | 8 ++++++++
1 file changed, 8 insertions(+)

Upstream: cgit.freedesktop.org


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