From 6d7c123d6ce46e71ef22e431b76e972b9be1a157 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Sat, 18 Jan 2014 10:47:19 -0800 Subject: [PATCH] glsl: Optimize log(exp(x)) and exp(log(x)) into x. Reviewed-by: Matt Turner --- src/glsl/opt_algebraic.cpp | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) 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; -- 2.11.0