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Add _X_COLD attribute for branch prediction hints

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Unfortunately the Solaris Studio equivalent is a pragma taking the
function names as arguments, so doesn't translate cleanly into a
common macro form.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Alan Coopersmith 2013-04-19 14:45:28 -07:00
parent d103af8068
commit 043ed78ce0
1 changed files with 9 additions and 0 deletions
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9
Xfuncproto.h.in
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@ -97,6 +97,7 @@ in this Software without prior written authorization from The Open Group.
# define _X_INTERNAL
#endif /* GNUC >= 4 */
/* Branch prediction hints for individual conditionals */
/* requires xproto >= 7.0.9 */
#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 303)
# define _X_LIKELY(x) __builtin_expect(!!(x), 1)
@ -106,6 +107,14 @@ in this Software without prior written authorization from The Open Group.
# define _X_UNLIKELY(x) (x)
#endif
/* Bulk branch prediction hints via marking error path functions as "cold" */
/* requires xproto >= 7.0.25 */
#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 403) /* 4.3+ */
# define _X_COLD __attribute__((__cold__))
#else
# define _X_COLD /* nothing */
#endif
/* Added in X11R6.9, so available in any version of modular xproto */
#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 301)
# define _X_DEPRECATED __attribute__((deprecated))