1 files changed, 52 insertions, 17 deletions
diff --git a/bson/inline_decls.h b/bson/inline_decls.h
index 1605611..30da9b4 100644
--- a/bson/inline_decls.h
+++ b/bson/inline_decls.h
@@ -1,20 +1,19 @@
-// inline.h
-
-/**
-*    Copyright (C) 2010 10gen Inc.
-*
-*    This program is free software: you can redistribute it and/or  modify
-*    it under the terms of the GNU Affero General Public License, version 3,
-*    as published by the Free Software Foundation.
-*
-*    This program is distributed in the hope that it will be useful,
-*    but WITHOUT ANY WARRANTY; without even the implied warranty of
-*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-*    GNU Affero General Public License for more details.
-*
-*    You should have received a copy of the GNU Affero General Public License
-*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
+// 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
 
@@ -31,3 +30,39 @@
 #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
+
+}