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glsl: Apply the transformation "(a && a) -> a" in opt_algebraic.
author
Eric Anholt
<eric@anholt.net>
Thu, 31 Oct 2013 16:32:42 +0000
(09:32 -0700)
committer
Eric Anholt
<eric@anholt.net>
Fri, 15 Nov 2013 19:33:07 +0000
(11:33 -0800)
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
src/glsl/opt_algebraic.cpp
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diff --git
a/src/glsl/opt_algebraic.cpp
b/src/glsl/opt_algebraic.cpp
index
3da27e5
..
ea3c386
100644
(file)
--- a/
src/glsl/opt_algebraic.cpp
+++ b/
src/glsl/opt_algebraic.cpp
@@
-357,7
+357,6
@@
ir_algebraic_visitor::handle_expression(ir_expression *ir)
break;
case ir_binop_logic_and:
- /* FINISHME: Also simplify (a && a) to (a). */
if (is_vec_one(op_const[0])) {
return ir->operands[1];
} else if (is_vec_one(op_const[1])) {
@@
-371,6
+370,9
@@
ir_algebraic_visitor::handle_expression(ir_expression *ir)
*/
return logic_not(logic_or(op_expr[0]->operands[0],
op_expr[1]->operands[0]));
+ } else if (ir->operands[0]->equals(ir->operands[1])) {
+ /* (a && a) == a */
+ return ir->operands[0];
}
break;