Merge pull request #197 from veblush/likely

Make UPB_LIKELY compatible with non-GNUC
5 years ago · 588128ccce
parent f3514c0600 401285b2f1
commit 588128ccce
1 changed files with 6 additions and 0 deletions
--- a/upb/port_def.inc
+++ b/upb/port_def.inc
@ -52,7 +52,13 @@
 #endif

 /* Hints to the compiler about likely/unlikely branches. */
+#ifdef __GNUC__
 #define UPB_LIKELY(x) __builtin_expect((x),1)
+#define UPB_UNLIKELY(x) __builtin_expect((x),0)
+#else
+#define UPB_LIKELY(x) (x)
+#define UPB_UNLIKELY(x) (x)
+#endif

 /* Define UPB_BIG_ENDIAN manually if you're on big endian and your compiler
 * doesn't provide these preprocessor symbols. */