A few Serious Sam 3 shaders affected:
instructions in affected programs: 4384 -> 4344 (-0.91%)
---
src/glsl/opt_algebraic.cpp | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 37b2f02..3bf0689 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -32,8 +32,11 @@
#include "ir_visitor.h"
#include "ir_rvalue_visitor.h"
#include "ir_optimization.h"
+#include "ir_builder.h"
#include "glsl_types.h"
+using namespace ir_builder;
+
namespace {
/**
@@ -436,6 +439,15 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
this->progress = true;
return new(mem_ctx) ir_constant(ir->type, &data);
+ } 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) or (not B) === not (A and B)
+ */
+ temp = logic_not(logic_and(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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