Mine

float function(float number){	long i;	float x2, y;	const float threehalfs = 1.5F;		x2 = number * 0.5F;	y  = number;	i  = * ( long * ) &y;	i  = 0x5f3759df - ( i >> 1 );	y  = * ( float * ) &i;	y  = y * ( threehalfs - ( x2 * y * y ) );	// y  = y * ( threehalfs - ( x2 * y * y ) );	return y;}