ref: 0184094beffb581a783c037aadbb4301c4e85f71
dir: /builtins.c/
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;
}