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optimize legacy ffs function

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This commit is contained in:
Rich Felker 2012-08-23 14:38:34 -04:00
parent a749ba3adc
commit 67ba40d1e0
1 changed files with 2 additions and 4 deletions
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6
src/misc/ffs.c
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@ -1,9 +1,7 @@
#include <strings.h> #include <strings.h>
#include "atomic.h"
int ffs(int i) int ffs(int i)
{ {
unsigned int j = i; return i ? a_ctz_l(i)+1 : 0;
for (i=1; j && !(j&1); j>>=1, i++);
if (j) return i;
return 0;
} }