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lib: prefix.c nano-optimisation

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* lib/prefix.c: (prefix_match) nano-optimisation, let it return early
  without copying pointers.
This commit is contained in:
Paul Jakma 2010-01-24 21:41:02 +00:00
parent 3322055b39
commit d358344759
1 changed files with 5 additions and 4 deletions
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9
lib/prefix.c
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@ -70,15 +70,16 @@ prefix_match (const struct prefix *n, const struct prefix *p)
{ {
int offset; int offset;
int shift; int shift;
const u_char *np, *pp;
/* Set both prefix's head pointer. */
const u_char *np = (const u_char *)&n->u.prefix;
const u_char *pp = (const u_char *)&p->u.prefix;
/* If n's prefix is longer than p's one return 0. */ /* If n's prefix is longer than p's one return 0. */
if (n->prefixlen > p->prefixlen) if (n->prefixlen > p->prefixlen)
return 0; return 0;
/* Set both prefix's head pointer. */
np = (const u_char *)&n->u.prefix;
pp = (const u_char *)&p->u.prefix;
offset = n->prefixlen / PNBBY; offset = n->prefixlen / PNBBY;
shift = n->prefixlen % PNBBY; shift = n->prefixlen % PNBBY;