Module: Mesa
Branch: master
Commit: f00fcfb7a2e137c7c0064b5e4167bb7fb49537a9
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=f00fcfb7a2e137c7c0064b5e4167bb7fb49537a9
Author: Ian Romanick <ian.d.roman...@intel.com>
Date: Thu May 31 12:56:00 2018 -0700
nir: Lower !f2b(x) to x == 0.0
Some trivial help now, but it also prevents ~40 regressions caused by
Samuel's "nir: implement the GLSL equivalent of if simplication in
nir_opt_if" patch.
All Gen4+ platforms had similar results. (Skylake shown)
total instructions in shared programs: 14369557 -> 14369555 (<.01%)
instructions in affected programs: 442 -> 440 (-0.45%)
helped: 2
HURT: 0
total cycles in shared programs: 532425772 -> 532425743 (<.01%)
cycles in affected programs: 6086 -> 6057 (-0.48%)
helped: 2
HURT: 0
Signed-off-by: Ian Romanick <ian.d.roman...@intel.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
Reviewed-by: Timothy Arceri <tarc...@itsqueeze.com>
Reviewed-by: Iago Toral Quiroga <ito...@igalia.com>
---
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 f153570105..fdfb0250b0 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -441,6 +441,7 @@ optimizations = [
(('i2b', ('iabs', a)), ('i2b', a)),
(('fabs', ('b2f', a)), ('b2f', a)),
(('iabs', ('b2i', a)), ('b2i', a)),
+ (('inot', ('f2b', a)), ('feq', a, 0.0)),
# Packing and then unpacking does nothing
(('unpack_64_2x32_split_x', ('pack_64_2x32_split', a, b)), a),
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