From: Ian Romanick Date: Wed, 2 Mar 2016 23:18:34 +0000 (-0800) Subject: nir: Simplify 0 >= b2f(a) X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=564a8b8a2645939cd416b62ae2e59c2fbd4b9fc2;p=mesa.git nir: Simplify 0 >= b2f(a) This also prevented some regressions with other patches in my local tree. Broadwell / Skylake total instructions in shared programs: 8980835 -> 8980833 (-0.00%) instructions in affected programs: 45 -> 43 (-4.44%) helped: 1 HURT: 0 total cycles in shared programs: 70077904 -> 70077900 (-0.00%) cycles in affected programs: 122 -> 118 (-3.28%) helped: 1 HURT: 0 No changes on earlier platforms. v2: Modify the comments to look more like a proof. Signed-off-by: Ian Romanick Reviewed-by: Matt Turner --- diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index 5b3694e1933..facc33b4e0a 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -101,6 +101,13 @@ optimizations = [ (('inot', ('ige', a, b)), ('ilt', a, b)), (('inot', ('ieq', a, b)), ('ine', a, b)), (('inot', ('ine', a, b)), ('ieq', a, b)), + + # 0.0 >= b2f(a) + # b2f(a) <= 0.0 + # b2f(a) == 0.0 because b2f(a) can only be 0 or 1 + # inot(a) + (('fge', 0.0, ('b2f', a)), ('inot', a)), + (('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)), (('bcsel', ('flt', a, b), a, b), ('fmin', a, b)), (('bcsel', ('flt', a, b), b, a), ('fmax', a, b)),