a_ctz_64
#define a_ctz_64 a_ctz_64
#define a_ctz_64 a_ctz_64
#define a_ctz_64 a_ctz_64
#ifndef a_ctz_64
#define a_ctz_64 a_ctz_64
return (sizeof(long) < 8) ? a_ctz_32(x) : a_ctz_64(x);
return i ? a_ctz_64(i)+1 : 0;