Hi,

I have aliases for radians and degrees that use float as the storage type.

When I convert between these two units I see the assembly promote the values to doubles and then back to floats.

How can I make sure that all operations and conversions stay in floats?

PS: I would not be surprised if I have defined my aliases or/and my conversion functions incorrectly.

My Code:
===

using radians_f = boost::units::quantity<boost::units::si::plane_angle, float>;
using degrees_f = boost::units::quantity<boost::units::degree::plane_angle, float>;

degrees_f to_degrees(const radians_f& angle) { return static_cast<degrees_f>(angle); }
radians_f to_radians(const degrees_f& angle) { return static_cast<radians_f>(angle); }

===

From compiler explorer I see the following assembly instructions: https://godbolt.org/z/Gnjr54dn6

cvtss2sd - Converts a single-precision floating-point value in the “convert-from” source operand to a double-precision floating-point value in the destination operand.

mulsd - Multiplies the low double-precision floating-point value in the second source operand by the low double-precision floating-point value in the first source operand.

cvtsd2ss - Converts a double-precision floating-point value in the “convert-from” source operand to a single-precision floating-point value

Any help will be appreciated.

Regards,

Carel