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authorRoxie Linden <roxie@lindenlab.com>2010-02-25 18:24:07 -0800
committerRoxie Linden <roxie@lindenlab.com>2010-02-25 18:24:07 -0800
commit9b05fecbf6b3d65dae5a010fc35821dc116a44d0 (patch)
tree9c0df85bb3a8b5c4e58655179e1b29ee31594cfc /indra/llcommon/llpreprocessor.h
parent5ed6e0720af1b6cdf1a983e2c040eeb5d8ae33ba (diff)
parentdb4e46e93d06c03520cb7c781b8e41b6d374414d (diff)
automated merge from trunk
Diffstat (limited to 'indra/llcommon/llpreprocessor.h')
-rw-r--r--indra/llcommon/llpreprocessor.h15
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 \