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glsl: Optimize log(exp(x)) and exp(log(x)) into x.

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Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Eric Anholt 2014-01-18 10:47:19 -08:00
parent 2c2aa35336
commit 6d7c123d6c
1 changed files with 36 additions and 0 deletions
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36
src/glsl/opt_algebraic.cpp
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@ -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;