小编CRI*_*IMX的帖子

我正在阅读lcc的源代码,在alloc.c:

if ((ap->next = freeblocks) != NULL) {
   freeblocks = freeblocks->next;
   ap = ap->next;
}

为什么不

if (freeblocks != NULL) {
   ap->next = freeblocks;
   freeblocks = freeblocks->next;
   ap = ap->next;
}

后者会造成额外费用吗？