static inline int constant_fls()

in include/asm/bitops.h [42:67]

• 25 lines of code
• 7 McCabe index (conditional complexity)

static inline int constant_fls(unsigned int x)
{
	int r = 32;

	if (!x)
		return 0;
	if (!(x & 0xffff0000u)) {
		x <<= 16;
		r -= 16;
	}
	if (!(x & 0xff000000u)) {
		x <<= 8;
		r -= 8;
	}
	if (!(x & 0xf0000000u)) {
		x <<= 4;
		r -= 4;
	}
	if (!(x & 0xc0000000u)) {
		x <<= 2;
		r -= 2;
	}
	if (!(x & 0x80000000u))
		r -= 1;
	return r;
}