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[OPTIM] add branch prediction hints in list manipulations

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GCC does not do very clever things with the ifs in list manipulation
macros. Adding a 'likely' helps it remove expensive jumps and useless
code.
This commit is contained in:
Willy Tarreau 2008-06-23 22:39:37 +02:00
parent b0b37bcd65
commit 47d940485a
1 changed files with 3 additions and 3 deletions
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6
include/common/mini-clist.h
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@ -1,6 +1,6 @@
/*
* list.h : list manipulation macros and structures.
* Copyright 2002-2007 Willy Tarreau <w@1wt.eu>
* Copyright 2002-2008 Willy Tarreau <w@1wt.eu>
*
*/
@ -41,10 +41,10 @@ struct list {
*/
/* adds an element at the beginning of a dual-linked list ; returns the element */
#define DLIST_ADD(lh, el) ({ typeof(el) __ret = (el); __ret->n = (void *)(lh); __ret->p = (void *)&(lh); if (__ret->n != NULL) __ret->n->p = __ret; (lh) = (typeof(lh))&__ret->n; __ret; })
#define DLIST_ADD(lh, el) ({ typeof(el) __ret = (el); __ret->n = (void *)(lh); __ret->p = (void *)&(lh); if (likely(__ret->n != NULL)) __ret->n->p = __ret; (lh) = (typeof(lh))&__ret->n; __ret; })
/* removes an element from a dual-linked list and returns it */
#define DLIST_DEL(el) ({ typeof(el) __ret = (el); if (__ret->n != NULL) __ret->n->p = __ret->p; __ret->p->n = __ret->n; __ret; })
#define DLIST_DEL(el) ({ typeof(el) __ret = (el); if (likely(__ret->n != NULL)) __ret->n->p = __ret->p; __ret->p->n = __ret->n; __ret; })
/*
* iterates through a list of items of type "<struct_type>" which are