C: Check if a number is a power of 2

is_power_of_2.c

#include <stdbool.h>

/*
 * https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
 */
bool isPowerOf2(unsigned int x)
{
	/*
 	 * Convert # into binary
 	 * If there is more than 1 "1", then
 	 * it is NOT a power of 2
 	 *
 	 * Returns the number of 1-bits in x.
 	 */
	if(__builtin_popcount(x) > 1) {
		return false;
	}
	
	return true;
}