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