[Mesa-dev] [PATCH 07/10] nir: Add algebraic optimizations for pointless shifts.
Kenneth Graunke
kenneth at whitecape.org
Thu Jan 22 03:41:28 PST 2015
The GLSL IR optimization pass contained these; we may as well include
them too.
No change in the number of NIR instructions on a shader-db run.
total i965 instructions in shared programs: 6035397 -> 6035393 (-0.00%)
i965 instructions in affected programs: 772 -> 768 (-0.52%)
helped: 3 (all in glamor)
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
src/glsl/nir/nir_opt_algebraic.py | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index cf16b19..58e71e0 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -83,6 +83,13 @@ optimizations = [
# DeMorgan's Laws
(('iand', ('inot', a), ('inot', b)), ('inot', ('ior', a, b))),
(('ior', ('inot', a), ('inot', b)), ('inot', ('iand', a, b))),
+ # Shift optimizations
+ (('ishl', 0, a), 0),
+ (('ishl', a, 0), 0),
+ (('ishr', 0, a), 0),
+ (('ishr', a, 0), 0),
+ (('ushr', 0, a), 0),
+ (('ushr', a, 0), 0),
# This one may not be exact
(('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),
--
2.2.2
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