py: Add MP_LIKELY(), MP_UNLIKELY() macros to help branch prediction.

2014-12-29 00:51:06 +02:00 · 2014-12-29 00:51:06 +02:00 · 361909e3ca
parent 1ee1785bed
commit 361909e3ca
1 changed files with 10 additions and 0 deletions
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@ -562,3 +562,13 @@ typedef double mp_float_t;
 #ifndef MP_WEAK
 #define MP_WEAK __attribute__((weak))
 #endif
+
+// Condition is likely to be true, to help branch prediction
+#ifndef MP_LIKELY
+#define MP_LIKELY(x) __builtin_expect((x), 1)
+#endif
+
+// Condition is likely to be false, to help branch prediction
+#ifndef MP_UNLIKELY
+#define MP_UNLIKELY(x) __builtin_expect((x), 0)
+#endif