Cuts a small handful of instructions in Serious Sam 3:
instructions in affected programs: 4692 -> 4666 (-0.55%)
---
src/glsl/opt_algebraic.cpp | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 8494bd9..2db877d 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -445,6 +445,28 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
}
break;
+ case ir_binop_less:
+ case ir_binop_lequal:
+ case ir_binop_greater:
+ case ir_binop_gequal:
+ case ir_binop_equal:
+ case ir_binop_nequal:
+ for (int add_pos = 0; add_pos < 2; add_pos++) {
+ ir_expression *add = op_expr[add_pos];
+
+ if (!add || add->operation != ir_binop_add)
+ continue;
+
+ ir_constant *zero = op_const[1 - add_pos];
+ if (!is_vec_zero(zero))
+ continue;
+
+ return new(mem_ctx) ir_expression(ir->operation,
+ add->operands[0],
+ neg(add->operands[1]));
+ }
+ break;
+
case ir_binop_rshift:
case ir_binop_lshift:
/* 0 >> x == 0 */
--
1.8.3.2
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