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compiler: don't remove floating point conversion of typed constant 

From-SVN: r193566
This commit is contained in:
Ian Lance Taylor 2012-11-16 16:30:56 +00:00
parent b346b9f105
commit dd4be52d2f
1 changed files with 40 additions and 0 deletions
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40
gcc/go/gofrontend/expressions.cc
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@ -2970,6 +2970,46 @@ Type_conversion_expression::do_lower(Gogo*, Named_object*,
{
if (!nc.set_type(type, true, location))
return Expression::make_error(location);
// Don't simply convert to or from a float or complex type
// with a different size. That may change the value.
Type* vtype = val->type();
if (vtype->is_abstract())
;
else if (type->float_type() != NULL)
{
if (vtype->float_type() != NULL)
{
if (type->float_type()->bits() != vtype->float_type()->bits())
return this;
}
else if (vtype->complex_type() != NULL)
{
if (type->float_type()->bits() * 2
!= vtype->complex_type()->bits())
return this;
}
}
else if (type->complex_type() != NULL)
{
if (vtype->complex_type() != NULL)
{
if (type->complex_type()->bits()
!= vtype->complex_type()->bits())
return this;
}
else if (vtype->float_type() != NULL)
{
if (type->complex_type()->bits()
!= vtype->float_type()->bits() * 2)
return this;
}
}
else if (vtype->float_type() != NULL)
return this;
else if (vtype->complex_type() != NULL)
return this;
return nc.expression(location);
}
}