File: ffs.c

package info (click to toggle)
gccxml 0.9.0%2Bgit20140716-2
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 60,796 kB
  • ctags: 77,240
  • sloc: ansic: 793,461; cpp: 37,497; asm: 26,833; sh: 5,086; makefile: 4,700; lex: 589; awk: 566; perl: 334; yacc: 271; pascal: 86
file content (26 lines) | stat: -rw-r--r-- 465 bytes parent folder | download | duplicates (91) 
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;
}