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nir: Transform -fabs(a) >= 0 to a == 0

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All Gen platforms had pretty similar results. (Skylake shown)
total instructions in shared programs: 14276964 -> 14276961 (<.01%)
instructions in affected programs: 411 -> 408 (-0.73%)
helped: 3
HURT: 0
helped stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1
helped stats (rel) min: 0.47% max: 1.96% x̄: 1.04% x̃: 0.68%

total cycles in shared programs: 532577062 -> 532577068 (<.01%)
cycles in affected programs: 1093 -> 1099 (0.55%)
helped: 1
HURT: 1
helped stats (abs) min: 16 max: 16 x̄: 16.00 x̃: 16
helped stats (rel) min: 7.77% max: 7.77% x̄: 7.77% x̃: 7.77%
HURT stats (abs)   min: 22 max: 22 x̄: 22.00 x̃: 22
HURT stats (rel)   min: 2.48% max: 2.48% x̄: 2.48% x̃: 2.48%

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Thomas Helland <thomashelland90@gmail.com>
This commit is contained in:
Ian Romanick
2018-08-01 19:46:26 -07:00
parent 46e7c340d4
commit 6b3670ae80
1 changed files with 9 additions and 0 deletions
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9
src/compiler/nir/nir_opt_algebraic.py
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@@ -235,6 +235,15 @@ optimizations = [
# fabs(a) > 0.0
(('~flt', ('fneg', ('fabs', a)), 0.0), ('fne', a, 0.0)),
# 0.0 >= fabs(a)
# 0.0 == fabs(a) because fabs(a) must be >= 0
# 0.0 == a
(('fge', 0.0, ('fabs', a)), ('feq', a, 0.0)),
# -fabs(a) >= 0.0
# 0.0 >= fabs(a)
(('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)),
(('fmax', ('b2f(is_used_once)', a), ('b2f', b)), ('b2f', ('ior', a, b))),
(('fmax', ('fneg(is_used_once)', ('b2f(is_used_once)', a)), ('fneg', ('b2f', b))), ('fneg', ('b2f', ('ior', a, b)))),
(('fmin', ('b2f(is_used_once)', a), ('b2f', b)), ('b2f', ('iand', a, b))),