File: ffs.c

package info (click to toggle)
gdb 10.1-1.7
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 310,484 kB
  • sloc: ansic: 1,939,704; asm: 342,615; exp: 164,493; cpp: 69,350; makefile: 59,036; sh: 25,131; yacc: 13,167; ada: 5,758; xml: 5,461; perl: 5,334; python: 4,761; pascal: 3,220; lisp: 1,575; tcl: 1,541; f90: 1,395; cs: 879; lex: 620; sed: 234; awk: 141; objc: 137; fortran: 62
file content (26 lines) | stat: -rw-r--r-- 465 bytes parent folder | download | duplicates (101) 
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;
}