File: ffz.h

package info (click to toggle)
fio 1.38-1
  • links: PTS, VCS
  • area: main
  • in suites: squeeze
  • size: 1,108 kB
  • ctags: 2,240
  • sloc: ansic: 17,668; makefile: 98; sh: 55
file content (37 lines) | stat: -rw-r--r-- 429 bytes parent folder | download
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
27
28
29
30
31
32
33
34
35
36
37
#ifndef FIO_FFZ_H
#define FIO_FFZ_H

static inline int __ffs(int word)
{
	int r = 0;

	if (!(word & 0xffff)) {
		word >>= 16;
		r += 16;
	}
	if (!(word & 0xff)) {
		word >>= 8;
		r += 8;
	}
	if (!(word & 0xf)) {
		word >>= 4;
		r += 4;
	}
	if (!(word & 3)) {
		word >>= 2;
		r += 2;
	}
	if (!(word & 1)) {
		word >>= 1;
		r += 1;
	}

	return r;
}

static inline int ffz(unsigned int bitmask)
{
	return __ffs(~bitmask);
}

#endif