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| author | James Cook <james@lindenlab.com> | 2010-02-03 14:13:56 -0800 |
|---|---|---|
| committer | James Cook <james@lindenlab.com> | 2010-02-03 14:13:56 -0800 |
| commit | 88350edbcbec615f3b15fc82bd5ce4005621ac6f (patch) | |
| tree | c244f41159cf32f3e03c6c311e1453bbd383bad5 /indra/llcommon/llpreprocessor.h | |
| parent | d489216b6ef41f0d22f3a9062ba6daacc67bc038 (diff) | |
| parent | 0bee31de32cb5999e7ec06d74f55d34ce0ac052b (diff) | |
merge
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 \ |