Commit 65a600f5 authored by Matt Turner's avatar Matt Turner
Browse files

glsl: Optimize (not A) or (not B) into not (A and B).



A few Serious Sam 3 shaders affected:

instructions in affected programs:     4384 -> 4344 (-0.91%)
Reviewed-by: Emma Anholt's avatarEric Anholt <eric@anholt.net>
parent e52959e9
......@@ -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]));
this->progress = true;
return swizzle_if_required(ir, temp);
}
break;
......
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