From: Doug Goldstein <cardoe@cardoe.com>
Date: Mon, 10 Mar 2014 01:18:49 +0000 (-0500)
Subject: add likely/unlikely branch hint macros
X-Git-Tag: v1.2~10^2~2
X-Git-Url: https://git.htl-mechatronik.at/public/?a=commitdiff_plain;h=663a5c215aecaad5ca9d921271a7f1af6449ca6e;p=sx%2Fsimavr.git

add likely/unlikely branch hint macros

Provide likely/unlikely branch hinting macros.
---

diff --git a/simavr/sim/sim_avr.h b/simavr/sim/sim_avr.h
index 9690cf7..07985e1 100644
--- a/simavr/sim/sim_avr.h
+++ b/simavr/sim/sim_avr.h
@@ -427,5 +427,27 @@ avr_pending_sleep_usec(
 #include "sim_io.h"
 #include "sim_regbit.h"
 
+#ifdef __GNUC__
+
+# ifndef likely
+#  define likely(x) __builtin_expect(!!(x), 1)
+# endif
+
+# ifndef unlikely
+#  define unlikely(x) __builtin_expect(!!(x), 0)
+# endif
+
+#else /* ! __GNUC__ */
+
+# ifndef likely
+#  define likely(x) x
+# endif
+
+# ifndef unlikely
+#  define unlikely(x) x
+# endif
+
+#endif /* __GNUC__ */
+
 #endif /*__SIM_AVR_H__*/