Module: Mesa
Branch: master
Commit: 6702f1acde9e93e41783fd2f4a7999fed8d9cb75
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=6702f1acde9e93e41783fd2f4a7999fed8d9cb75
Author: Matt Turner <matts...@gmail.com>
Date: Mon Feb 22 15:16:49 2016 -0800
nir: Propagate negates up multiplication chains.
total instructions in shared programs: 7112159 -> 7088092 (-0.34%)
instructions in affected programs: 1374915 -> 1350848 (-1.75%)
helped: 7392
HURT: 621
GAINED: 2
LOST: 2
---
src/compiler/nir/nir_opt_algebraic.py | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/compiler/nir/nir_opt_algebraic.py
b/src/compiler/nir/nir_opt_algebraic.py
index 5363323..c2e56e7 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -269,6 +269,10 @@ optimizations = [
(('fabs', ('fsub', 0.0, a)), ('fabs', a)),
(('iabs', ('isub', 0, a)), ('iabs', a)),
+ # Propagate negation up multiplication chains
+ (('fmul', ('fneg', a), b), ('fneg', ('fmul', a, b))),
+ (('imul', ('ineg', a), b), ('ineg', ('fmul', a, b))),
+
# Misc. lowering
(('fmod', a, b), ('fsub', a, ('fmul', b, ('ffloor', ('fdiv', a, b)))),
'options->lower_fmod'),
(('uadd_carry', a, b), ('b2i', ('ult', ('iadd', a, b), a)),
'options->lower_uadd_carry'),
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