From cbe647786f8631d32fc5f9226853950359207699 Mon Sep 17 00:00:00 2001 From: Tofu Linden Date: Mon, 25 Jan 2010 14:25:58 -0800 Subject: We already have a LL_FORCE_INLINE in llpreprocessor.h, don't re-invent it for llfasttimers.h. Also define LL_LIKELY/LL_UNLIKELY with a warning about its micro-optimizey nature, and use it to annotate llasserts (i.e. make llassert() lower-overhead and thus more attractive, even in inner-ish loops.) --- indra/llcommon/llpreprocessor.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'indra/llcommon/llpreprocessor.h') 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 \ -- cgit v1.2.3