summaryrefslogtreecommitdiffstats
path: root/libiberty/ffs.c
blob: 603cbe8ed994536776e2031b7afa6ca521e54ecc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
/* ffs -- Find the first bit set in the parameter

@deftypefn Supplemental int ffs (int @var{valu})

Find the first (least significant) bit set in @var{valu}.  Bits are
numbered from right to left, starting with bit 1 (corresponding to the
value 1).  If @var{valu} is zero, zero is returned.

@end deftypefn

*/

int
ffs (register int valu)
{
  register int bit;

  if (valu == 0)
    return 0;

  for (bit = 1; !(valu & 1); bit++)
  	valu >>= 1;

  return bit;
}

OpenPOWER on IntegriCloud