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// 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 enter the if statement body
# define MONGOIF(x) if( (x) )
// branch prediction. indicate we expect to not enter the if statement body
# define MONGO_IF(x) if( (x) )
# if defined(_WIN32)
// prefetch data from memory
inline void prefetch(const void *p) {
_mm_prefetch((char *) p, _MM_HINT_T0);
}
#else
inline void prefetch(void *p) { }
#endif
#else
# define MONGOIF(x) if( __builtin_expect((x), 1) )
# define MONGO_IF(x) if( __builtin_expect((x), 0) )
inline void prefetch(void *p) {
}
#endif
}
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