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

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Paul Sokolovsky
2014-12-29 00:51:06 +02:00
parent 1ee1785bed
commit 361909e3ca
1 changed files with 10 additions and 0 deletions
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10
py/mpconfig.h
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@@ -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