Mesa (master): glsl: Recognize mul(b2f(a), b2f(b)) as a logical AND.

[Matt Turner]

Module: Mesa
Branch: master
Commit: c8e8f660365515560af029651e593f7ee700401c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c8e8f660365515560af029651e593f7ee700401c

Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Mar 17 23:28:27 2015 -0700

glsl: Recognize mul(b2f(a), b2f(b)) as a logical AND.

Transform this into b2f(and(a, b)).

total instructions in shared programs: 6190291 -> 6189225 (-0.02%)
instructions in affected programs:     267247 -> 266181 (-0.40%)
helped:                                866

Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/glsl/opt_algebraic.cpp |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 69c03ea..0d1f3fc 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -518,6 +518,10 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
       if (is_vec_negative_one(op_const[1]))
          return neg(ir->operands[0]);
 
+      if (op_expr[0] && op_expr[0]->operation == ir_unop_b2f &&
+          op_expr[1] && op_expr[1]->operation == ir_unop_b2f) {
+         return b2f(logic_and(op_expr[0]->operands[0], op_expr[1]->operands[0]));
+      }
 
       /* Reassociate multiplication of constants so that we can do
        * constant folding.