shader-db results based on my scalarizing patches:
total instructions in shared programs: 6077319 -> 6076895 (-0.01%)
instructions in affected programs: 63509 -> 63085 (-0.67%)
helped: 306
HURT: 0
GAINED: 0
LOST: 0
---
src/glsl/nir/nir_opt_algebraic.py | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/src/glsl/nir/nir_opt_algebraic.py
b/src/glsl/nir/nir_opt_algebraic.py
index 9c62b28..481ef58 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -116,4 +116,17 @@ optimizations = [
(('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),
]
+# Add optimizations to handle the case where the result of a ternary is
+# compared to a constant. This way we can take things like
+for op in ['flt', 'fge', 'feq', 'fne',
+ 'ilt', 'ige', 'ieq', 'ine', 'ult', 'uge']:
+ optimizations += [
+ ((op, ('bcsel', 'a', '#b', '#c'), '#d'),
+ ('bcsel', 'a', (op, 'b', 'd'), (op, 'c', 'd'))),
+ ((op, '#d', ('bcsel', a, '#b', '#c')),
+ ('bcsel', 'a', (op, 'd', 'b'), (op, 'd', 'c'))),
+ (('bcsel', (op, 'a', 'b'), True, False), (op, 'a', 'b')),
+ (('bcsel', (op, 'a', 'b'), False, True), ('inot', (op, 'a', 'b'))),
+ ]
+
print nir_algebraic.AlgebraicPass("nir_opt_algebraic", optimizations).render()
--
2.2.1
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