From: Thomas Helland <thomashellan...@gmail.com>
And the log2() equivalent.
v1 -> v2: Correct trailing whitespace
Signed-off-by: Thomas Helland <thomashelland90 at gmail.com>
Reviewed-by: Eric Anholt <eric at anholt.net>
---
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 42a70e3..141b930 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -380,6 +380,18 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
return expr;
}
+ /* log(x) + log(y) == log(x*y) */
+ if (op_expr[0] && op_expr[0]->operation == ir_unop_log &&
+ op_expr[1] && op_expr[1]->operation == ir_unop_log)
+ return new(mem_ctx) ir_expression(
+ ir_unop_log, mul(op_expr[0]->operands[0], op_expr[1]->operands[0])
);
+
+ /* log2(x) + log2(y) == log2(x*y) */
+ if (op_expr[0] && op_expr[0]->operation == ir_unop_log2 &&
+ op_expr[1] && op_expr[1]->operation == ir_unop_log2)
+ return new(mem_ctx) ir_expression(
+ ir_unop_log2, mul(op_expr[0]->operands[0],
op_expr[1]->operands[0]) );
+
/* Replace (-x + y) * a + x and commutative variations with lrp(x, y, a).
*
* (-x + y) * a + x
--
2.0.3
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