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nir/algebraic: i2f(f2i()) -> trunc() 

total instructions in shared programs: 12840968 -> 12840784 (<.01%)
instructions in affected programs: 17886 -> 17702 (-1.03%)
helped: 77
HURT: 0

total cycles in shared programs: 302508917 -> 302505592 (<.01%)
cycles in affected programs: 249964 -> 246639 (-1.33%)
helped: 70
HURT: 7

Signed-off-by: Elie Tournier <elie.tournier@collabora.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/948>
This commit is contained in:
Elie Tournier 2019-05-23 17:16:18 +01:00 committed by Marge Bot
parent 3d9a3d0be0
commit 6f394343b1
1 changed files with 5 additions and 0 deletions
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5
src/compiler/nir/nir_opt_algebraic.py
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@ -803,6 +803,11 @@ optimizations.extend([
(('i2b', ('iabs', a)), ('i2b', a)),
(('inot', ('f2b1', a)), ('feq', a, 0.0)),
# The C spec says, "If the value of the integral part cannot be represented
# by the integer type, the behavior is undefined." "Undefined" can mean
# "the conversion doesn't happen at all."
(('~i2f32', ('f2i32', 'a@32')), ('ftrunc', a)),
# Ironically, mark these as imprecise because removing the conversions may
# preserve more precision than doing the conversions (e.g.,
# uint(float(0x81818181u)) == 0x81818200).