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Support inlining various small performance-critical functions on non-GCC

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compilers, by applying a configure check to see if the compiler will accept
an unreferenced "static inline foo ..." function without warnings.  It is
believed that such warnings are the only reason not to declare inlined
functions in headers, if the compiler understands "inline" at all.

Kurt Harriman
This commit is contained in:
Tom Lane
2010-02-13 02:34:16 +00:00
parent b95a720a48
commit e08ab7c312
11 changed files with 137 additions and 46 deletions
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16
src/include/nodes/pg_list.h
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@@ -30,7 +30,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/pg_list.h,v 1.62 2010/01/02 16:58:04 momjian Exp $
* $PostgreSQL: pgsql/src/include/nodes/pg_list.h,v 1.63 2010/02/13 02:34:13 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -71,24 +71,24 @@ struct ListCell
/*
* These routines are used frequently. However, we can't implement
* them as macros, since we want to avoid double-evaluation of macro
* arguments. Therefore, we implement them using GCC inline functions,
* and as regular functions with non-GCC compilers.
* arguments. Therefore, we implement them using static inline functions
* if supported by the compiler, or as regular functions otherwise.
*/
#ifdef __GNUC__
#ifdef USE_INLINE
static __inline__ ListCell *
static inline ListCell *
list_head(List *l)
{
return l ? l->head : NULL;
}
static __inline__ ListCell *
static inline ListCell *
list_tail(List *l)
{
return l ? l->tail : NULL;
}
static __inline__ int
static inline int
list_length(List *l)
{
return l ? l->length : 0;
@@ -98,7 +98,7 @@ list_length(List *l)
extern ListCell *list_head(List *l);
extern ListCell *list_tail(List *l);
extern int list_length(List *l);
#endif /* __GNUC__ */
#endif /* USE_INLINE */
/*
* NB: There is an unfortunate legacy from a previous incarnation of