1 /* ffs -- Find the first bit set in the parameter 2 3 @deftypefn Supplemental int ffs (int @var{valu}) 4 5 Find the first (least significant) bit set in @var{valu}. Bits are 6 numbered from right to left, starting with bit 1 (corresponding to the 7 value 1). If @var{valu} is zero, zero is returned. 8 9 @end deftypefn 10 11 */ 12 13 int 14 ffs (register int valu) 15 { 16 register int bit; 17 18 if (valu == 0) 19 return 0; 20 21 for (bit = 1; !(valu & 1); bit++) 22 valu >>= 1; 23 24 return bit; 25 } 26 27
