shithub: jxl

ref: e7ea7adedf43ec7e815cc105cf8028af81b5cf1e
dir: /builtins.c/

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int
__builtin_clz(unsigned int x)
{
	unsigned int r;
	if(x == 0)
		return 32;
	for(r = 0; (x & (1UL<<31)) == 0; x <<= 1, r++);
	return r;
}

int
__builtin_clzll(unsigned long long x)
{
	unsigned long long r;
	if(x == 0)
		return 64;
	for(r = 0; (x & (1ULL<<63)) == 0; x <<= 1, r++);
	return r;
}