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authorEric Anholt <[email protected]>2014-01-18 10:47:19 -0800
committerEric Anholt <[email protected]>2014-02-07 12:46:47 -0800
commit6d7c123d6ce46e71ef22e431b76e972b9be1a157 (patch)
treeb038ad90bd428635c259faa50d8f38fdf0945fd3 /src
parent2c2aa353366c610382273bea10656e6d6960ce3b (diff)
glsl: Optimize log(exp(x)) and exp(log(x)) into x.
Reviewed-by: Matt Turner <[email protected]>
Diffstat (limited to 'src')
-rw-r--r--src/glsl/opt_algebraic.cpp36
1 files changed, 36 insertions, 0 deletions
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 681973dda0e..1e715817f76 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -245,6 +245,42 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
}
break;
+ case ir_unop_exp:
+ if (op_expr[0] == NULL)
+ break;
+
+ if (op_expr[0]->operation == ir_unop_log) {
+ return op_expr[0]->operands[0];
+ }
+ break;
+
+ case ir_unop_log:
+ if (op_expr[0] == NULL)
+ break;
+
+ if (op_expr[0]->operation == ir_unop_exp) {
+ return op_expr[0]->operands[0];
+ }
+ break;
+
+ case ir_unop_exp2:
+ if (op_expr[0] == NULL)
+ break;
+
+ if (op_expr[0]->operation == ir_unop_log2) {
+ return op_expr[0]->operands[0];
+ }
+ break;
+
+ case ir_unop_log2:
+ if (op_expr[0] == NULL)
+ break;
+
+ if (op_expr[0]->operation == ir_unop_exp2) {
+ return op_expr[0]->operands[0];
+ }
+ break;
+
case ir_unop_logic_not: {
enum ir_expression_operation new_op = ir_unop_logic_not;