likely() and unlikely() macros to help (newer) compilers optimize correctly

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16369 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 7 insertions, 0 deletions

diff --git a/configure b/configure
index 3f241558ea..4f5afa6b66 100755
--- a/configure
+++ b/configure
@@ -7161,6 +7161,13 @@ $_def_restrict_keyword
 
 /* __builtin_expect branch prediction hint */
 $_def_builtin_expect
+#ifdef HAVE_BUILTIN_EXPECT
+#define likely(x) __builtin_expect ((x) != 0, 1)
+#define unlikely(x) __builtin_expect ((x) != 0, 0)
+#else
+#define likely(x) (x)
+#define unlikely(x) (x)
+#endif
 
 /* attribute(used) as needed by some compilers */
 #if (__GNUC__ * 100 + __GNUC_MINOR__ >= 300)