function xlogyf( x, y ) {
	return addon( x, y );
}
Computes `x * ln(y)` so that the result is `0` if `x = 0` for single-precision floating-point numbers `x` and `y`.

@private
@param {number} x - input value
@param {number} y - input value
@returns {number} function value

@example
var v = xlogyf( 3.0, 2.0 );
// returns ~2.079

@example
var v = xlogyf( 0.0, 2.0 );
// returns 0.0