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faster INCR doing far less allocation in common cases

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antirez 2010-12-10 17:03:38 +01:00
parent dd48de748c
commit b215a496a4
1 changed files with 16 additions and 1 deletions
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17
src/t_string.c
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@ -144,8 +144,23 @@ void incrDecrCommand(redisClient *c, long long incr) {
o = lookupKeyWrite(c->db,c->argv[1]);
if (o != NULL && checkType(c,o,REDIS_STRING)) return;
if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return;
/* Fast path if the object is integer encoded and is not shared. */
if (o && o->refcount == 1 && o->encoding == REDIS_ENCODING_INT) {
long long newval = ((long)o->ptr) + incr;
if (newval >= LONG_MIN && newval <= LONG_MAX) {
o->ptr = (void*) (long) newval;
touchWatchedKey(c->db,c->argv[1]);
server.dirty++;
addReplyLongLong(c,newval);
return;
}
/* ... else take the usual safe path */
}
/* Otherwise we create a new object and replace the old one. */
if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return;
value += incr;
o = createStringObjectFromLongLong(value);
dbReplace(c->db,c->argv[1],o);