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compiler: Lower constant string comparisons. 

From-SVN: r184316
This commit is contained in:
Ian Lance Taylor 2012-02-16 22:10:26 +00:00
parent 539b471b67
commit 60a3da27fe
1 changed files with 35 additions and 4 deletions
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39
gcc/go/gofrontend/expressions.cc
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@ -5824,15 +5824,46 @@ Binary_expression::do_lower(Gogo* gogo, Named_object*,
}
// String constant expressions.
if (op == OPERATOR_PLUS
&& left->type()->is_string_type()
&& right->type()->is_string_type())
if (left->type()->is_string_type() && right->type()->is_string_type())
{
std::string left_string;
std::string right_string;
if (left->string_constant_value(&left_string)
&& right->string_constant_value(&right_string))
return Expression::make_string(left_string + right_string, location);
{
if (op == OPERATOR_PLUS)
return Expression::make_string(left_string + right_string,
location);
else if (is_comparison)
{
int cmp = left_string.compare(right_string);
bool r;
switch (op)
{
case OPERATOR_EQEQ:
r = cmp == 0;
break;
case OPERATOR_NOTEQ:
r = cmp != 0;
break;
case OPERATOR_LT:
r = cmp < 0;
break;
case OPERATOR_LE:
r = cmp <= 0;
break;
case OPERATOR_GT:
r = cmp > 0;
break;
case OPERATOR_GE:
r = cmp >= 0;
break;
default:
go_unreachable();
}
return Expression::make_boolean(r, location);
}
}
}
// Special case for shift of a floating point constant.