No shader-db changes, but seems like a good idea.
---
src/glsl/opt_algebraic.cpp | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 3bf0689..1ce9e2d 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -401,6 +401,15 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
} else if (is_vec_zero(op_const[0]) || is_vec_zero(op_const[1])) {
this->progress = true;
return ir_constant::zero(mem_ctx, ir->type);
+ } else if (op_expr[0] && op_expr[0]->operation == ir_unop_logic_not &&
+ op_expr[1] && op_expr[1]->operation == ir_unop_logic_not) {
+ /* De Morgan's Law:
+ * (not A) and (not B) === not (A or B)
+ */
+ temp = logic_not(logic_or(op_expr[0]->operands[0],
+ op_expr[1]->operands[0]));
+ return swizzle_if_required(ir, temp);
+ this->progress = true;
}
break;
--
1.8.3.2
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