mirror of https://gitee.com/bigwinds/arangodb
104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef LIB_BASICS_SYSTEM_COMPILER_H
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#define LIB_BASICS_SYSTEM_COMPILER_H 1
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#ifndef TRI_WITHIN_COMMON
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#error use <Basics/Common.h>
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @brief mark a value as unused
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_HAVE_GCC_UNUSED
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#define TRI_UNUSED __attribute__((unused))
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#else
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#define TRI_UNUSED /* unused */
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @brief warn if return is unused
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_HAVE_GCC_ATTRIBUTE
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#define TRI_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#else
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#define TRI_WARN_UNUSED_RESULT /* unused */
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @brief expect false
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///
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/// @param
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/// a the value
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_HAVE_GCC_BUILTIN
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#define EF(a) __builtin_expect(a, false)
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#else
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#define EF(a) a
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @brief expect true
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///
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/// @param
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/// a the value
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_HAVE_GCC_BUILTIN
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#define ET(a) __builtin_expect(a, true)
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#else
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#define ET(a) a
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @brief prefetch read
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///
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/// @param
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/// a the value to prefetch
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_HAVE_GCC_BUILTIN
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#define PR(a) __builtin_prefetch(a, 0, 0)
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#else
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#define PR(a) /* prefetch read */
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @brief prefetch write
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///
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/// @param
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/// a the value to prefetch
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_HAVE_GCC_BUILTIN
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#define PW(a) __builtin_prefetch(a, 1, 0)
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#else
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#define PW(a) /* prefetch write */
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#endif
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#endif
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