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| author | Callum Prentice <callum@lindenlab.com> | 2010-02-04 17:03:41 -0800 |
|---|---|---|
| committer | Callum Prentice <callum@lindenlab.com> | 2010-02-04 17:03:41 -0800 |
| commit | 259fa5fd0b67459145eb5463d79f37271ee7af0a (patch) | |
| tree | 27c7eaddb0c6f7dd406228e3a61fc89b6fedb159 /indra/llcommon/llpreprocessor.h | |
| parent | 80139d95adbcb2258c5541a4e0ace32f32b78ba5 (diff) | |
| parent | a4aed31ad9fd1874b134af87145ec93b283dbbfb (diff) | |
Merge with tip
Diffstat (limited to 'indra/llcommon/llpreprocessor.h')
| -rw-r--r-- | indra/llcommon/llpreprocessor.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/indra/llcommon/llpreprocessor.h b/indra/llcommon/llpreprocessor.h index 5eefa6a16b..1c1503ca7b 100644 --- a/indra/llcommon/llpreprocessor.h +++ b/indra/llcommon/llpreprocessor.h @@ -55,13 +55,28 @@ #define LL_BIG_ENDIAN 1 #endif + // Per-compiler switches + #ifdef __GNUC__ #define LL_FORCE_INLINE inline __attribute__((always_inline)) #else #define LL_FORCE_INLINE __forceinline #endif +// Mark-up expressions with branch prediction hints. Do NOT use +// this with reckless abandon - it's an obfuscating micro-optimization +// outside of inner loops or other places where you are OVERWHELMINGLY +// sure which way an expression almost-always evaluates. +#if __GNUC__ >= 3 +# define LL_LIKELY(EXPR) __builtin_expect (!!(EXPR), true) +# define LL_UNLIKELY(EXPR) __builtin_expect (!!(EXPR), false) +#else +# define LL_LIKELY(EXPR) (EXPR) +# define LL_UNLIKELY(EXPR) (EXPR) +#endif + + // Figure out differences between compilers #if defined(__GNUC__) #define GCC_VERSION (__GNUC__ * 10000 \ |