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authorIan Romanick <ian.d.romanick@intel.com>2018-08-01 19:32:18 -0700
committerIan Romanick <ian.d.romanick@intel.com>2018-08-04 01:12:03 -0700
commit3aca80aabccaa2a785bd6d25f73bd1935d4dd35b (patch)
tree27127e92844529a0e9567b9a4fef9160380271a8 /src
parent1713c9718133aeec14c2776f1e2c5e8d75b29712 (diff)
nir: Transform expressions of b2f(a) and b2f(b) to !(a && b)
All Gen platforms had pretty similar results. (Skylake shown) total cycles in shared programs: 532578400 -> 532578397 (<.01%) cycles in affected programs: 2784 -> 2781 (-0.11%) helped: 1 HURT: 1 helped stats (abs) min: 4 max: 4 x̄: 4.00 x̃: 4 helped stats (rel) min: 0.26% max: 0.26% x̄: 0.26% x̃: 0.26% HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1 HURT stats (rel) min: 0.08% max: 0.08% x̄: 0.08% x̃: 0.08% v2: s/fmax/fmin/. Noticed by Thomas Helland. Signed-off-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Thomas Helland <thomashelland90@gmail.com>
Diffstat (limited to 'src')
-rw-r--r--src/compiler/nir/nir_opt_algebraic.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 7431642c8a0..9ead2dd37d5 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -177,6 +177,9 @@ optimizations = [
(('feq', ('fmax', ('b2f', a), ('b2f', b)), 0.0), ('inot', ('ior', a, b))),
(('feq', ('bcsel', a, 1.0, ('b2f', b)) , 0.0), ('inot', ('ior', a, b))),
(('feq', ('b2f', a), ('fneg', ('b2f', b))), ('inot', ('ior', a, b))),
+ (('feq', ('fmul', ('b2f', a), ('b2f', b)), 0.0), ('inot', ('iand', a, b))),
+ (('feq', ('fmin', ('b2f', a), ('b2f', b)), 0.0), ('inot', ('iand', a, b))),
+ (('feq', ('bcsel', a, ('b2f', b), 0.0) , 0.0), ('inot', ('iand', a, b))),
# -(b2f(a) + b2f(b)) < 0
# 0 < b2f(a) + b2f(b)