From 08ff5f4d1f04ea426be679018c2c38da6b6b9a65 Mon Sep 17 00:00:00 2001 From: Ian Romanick Date: Tue, 29 Mar 2016 15:25:04 -0700 Subject: [PATCH] nir: Simplify a bcsel to logical-or Oddly, this did not affect the shader where I first noticed the pattern. That particular shader doesn't get its if-statement converted to a bcsel because there are two assignments in the else-statement. This led to me submitting https://bugs.freedesktop.org/show_bug.cgi?id=94747. shader-db results: Sandy Bridge total instructions in shared programs: 8467384 -> 8467069 (-0.00%) instructions in affected programs: 36594 -> 36279 (-0.86%) helped: 46 HURT: 0 total cycles in shared programs: 117573448 -> 117568518 (-0.00%) cycles in affected programs: 339114 -> 334184 (-1.45%) helped: 46 HURT: 0 Ivy Bridge / Haswell / Broadwell / Skylake: total instructions in shared programs: 7774258 -> 7773999 (-0.00%) instructions in affected programs: 30874 -> 30615 (-0.84%) helped: 46 HURT: 0 total cycles in shared programs: 65739190 -> 65734530 (-0.01%) cycles in affected programs: 180380 -> 175720 (-2.58%) helped: 45 HURT: 1 No change on G45 or Ironlake. I also tried these expressions, but none of them affected any shaders in shader-db: (('bcsel', a, 'a@bool', 'b@bool'), ('ior', a, b)), (('bcsel', a, 'b@bool', False), ('iand', a, b)), (('bcsel', a, 'b@bool', 'a@bool'), ('iand', a, b)), Signed-off-by: Ian Romanick Reviewed-by: Iago Toral Quiroga Reviewed-by: Kenneth Graunke --- src/compiler/nir/nir_opt_algebraic.py | 1 + 1 file changed, 1 insertion(+) diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index 2fac9adafe6..e72b4a791cb 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -126,6 +126,7 @@ optimizations = [ (('bcsel', ('flt', a, b), b, a), ('fmax', a, b)), (('bcsel', ('inot', 'a@bool'), b, c), ('bcsel', a, c, b)), (('bcsel', a, ('bcsel', a, b, c), d), ('bcsel', a, b, d)), + (('bcsel', a, True, 'b@bool'), ('ior', a, b)), (('fmin', a, a), a), (('fmax', a, a), a), (('imin', a, a), a), -- 2.30.2