[Mesa-dev] [PATCH 1/2] nir: Recognize a pattern for doing b2f without the opcode.

[Eric Anholt]

Since we have patterns based on b2f, generate them if we see the b2f
equivalent using an iand.  This is common when generating NIR from TGSI.
---
 src/glsl/nir/nir_opt_algebraic.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index 66b456d..301d7a8 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -99,6 +99,7 @@ optimizations = [
    # Emulating booleans
    (('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))),
    (('fsat', ('fadd', ('b2f', a), ('b2f', b))), ('b2f', ('ior', a, b))),
+   (('iand', 'a at bool', 1.0), ('b2f', a)),
    # Comparison with the same args.  Note that these are not done for
    # the float versions because NaN always returns false on float
    # inequalities.
-- 
2.1.4