1 files changed, 68 insertions, 0 deletions
diff --git a/src/mongo/bson/inline_decls.h b/src/mongo/bson/inline_decls.h
new file mode 100644
index 00000000000..30da9b4560d
--- /dev/null
+++ b/src/mongo/bson/inline_decls.h
@@ -0,0 +1,68 @@
+// inline_decls.h
+
+/*    Copyright 2010 10gen Inc.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#pragma once
+
+#if defined(__GNUC__)
+
+#define NOINLINE_DECL __attribute__((noinline))
+
+#elif defined(_MSC_VER)
+
+#define NOINLINE_DECL __declspec(noinline)
+
+#else
+
+#define NOINLINE_DECL
+
+#endif
+
+namespace mongo {
+
+/* Note: do not clutter code with these -- ONLY use in hot spots / significant loops. */
+
+#if !defined(__GNUC__)
+
+// branch prediction.  indicate we expect to be true
+# define MONGO_likely(x) ((bool)(x))
+
+// branch prediction.  indicate we expect to be false
+# define MONGO_unlikely(x) ((bool)(x))
+
+# if defined(_WIN32)
+    // prefetch data from memory
+    inline void prefetch(const void *p) { 
+#if defined(_MM_HINT_T0)
+        _mm_prefetch((char *) p, _MM_HINT_T0);
+#endif
+    }
+#else
+    inline void prefetch(void *p) { }
+#endif
+
+#else
+
+# define MONGO_likely(x) ( __builtin_expect((bool)(x), 1) )
+# define MONGO_unlikely(x) ( __builtin_expect((bool)(x), 0) )
+
+    inline void prefetch(void *p) { 
+        __builtin_prefetch(p);
+    }
+
+#endif
+
+}