---
src/glsl/opt_algebraic.cpp | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index ea3c386..448f27e 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -377,7 +377,6 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
break;
case ir_binop_logic_xor:
- /* FINISHME: Also simplify (a ^^ a) to (false). */
if (is_vec_zero(op_const[0])) {
return ir->operands[1];
} else if (is_vec_zero(op_const[1])) {
@@ -386,6 +385,9 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
return logic_not(ir->operands[1]);
} else if (is_vec_one(op_const[1])) {
return logic_not(ir->operands[0]);
+ } else if (ir->operands[0]->equals(ir->operands[1])) {
+ /* (a ^^ a) == false */
+ return ir_constant::zero(mem_ctx, ir->type);
}
break;
--
1.8.4.rc3
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