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authorMatt Turner <mattst88@gmail.com>2017-06-30 15:48:19 -0700
committerMatt Turner <mattst88@gmail.com>2017-07-20 16:56:50 -0700
commitaff108f2fd303ea4671541c8eca8550ddf69dc13 (patch)
treeee453fc4f9975d87fceefa4605a887e9dfa0cdbd /src/compiler
parent069bf7c9078a1b03414a6ace4bbff887e212ab90 (diff)
nir: Optimize find_lsb/imsb/umsb error checks
Two of the ARB_shader_ballot piglit tests hit the find_lsb case, removing some of the noise allowed me to better debug the test when it was failing. Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Diffstat (limited to 'src/compiler')
-rw-r--r--src/compiler/nir/nir_opt_algebraic.py11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index fe6e33d3139..df5854270c4 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -357,6 +357,17 @@ optimizations = [
(('~fadd', '#a', ('fadd', b, '#c')), ('fadd', ('fadd', a, c), b)),
(('iadd', '#a', ('iadd', b, '#c')), ('iadd', ('iadd', a, c), b)),
+ # By definition...
+ (('bcsel', ('ige', ('find_lsb', a), 0), ('find_lsb', a), -1), ('find_lsb', a)),
+ (('bcsel', ('ige', ('ifind_msb', a), 0), ('ifind_msb', a), -1), ('ifind_msb', a)),
+ (('bcsel', ('ige', ('ufind_msb', a), 0), ('ufind_msb', a), -1), ('ufind_msb', a)),
+
+ (('bcsel', ('ine', a, 0), ('find_lsb', a), -1), ('find_lsb', a)),
+ (('bcsel', ('ine', a, 0), ('ifind_msb', a), -1), ('ifind_msb', a)),
+ (('bcsel', ('ine', a, 0), ('ufind_msb', a), -1), ('ufind_msb', a)),
+
+ (('bcsel', ('ine', a, -1), ('ifind_msb', a), -1), ('ifind_msb', a)),
+
# Misc. lowering
(('fmod@32', a, b), ('fsub', a, ('fmul', b, ('ffloor', ('fdiv', a, b)))), 'options->lower_fmod32'),
(('fmod@64', a, b), ('fsub', a, ('fmul', b, ('ffloor', ('fdiv', a, b)))), 'options->lower_fmod64'),