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74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
/*============================================================================*/
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/*
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VFLib: https://github.com/vinniefalco/VFLib
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Copyright (C) 2008 by Vinnie Falco <vinnie.falco@gmail.com>
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This library contains portions of other open source products covered by
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separate licenses. Please see the corresponding source files for specific
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terms.
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VFLib is provided under the terms of The MIT License (MIT):
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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/*============================================================================*/
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#ifndef BEAST_MEMORYALIGNMENT_BEASTHEADER
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#define BEAST_MEMORYALIGNMENT_BEASTHEADER
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namespace Memory
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{
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// Constants
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const int cacheLineAlignBits = 6; // 64 bytes
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const int cacheLineAlignBytes = 1 << cacheLineAlignBits;
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const int cacheLineAlignMask = cacheLineAlignBytes - 1;
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const int allocAlignBits = 3; // 8 bytes
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const int allocAlignBytes = 1 << allocAlignBits;
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const int allocAlignMask = allocAlignBytes - 1;
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// Returns the number of bytes needed to advance p to the correct alignment
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template <typename P>
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inline size_t bytesNeededForAlignment (P const* const p)
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{
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return (allocAlignBytes - (uintptr_t (p) & allocAlignMask))
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& allocAlignMask;
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}
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// Returns the number of bytes to make "bytes" an aligned size
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inline size_t sizeAdjustedForAlignment (const size_t bytes)
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{
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return (bytes + allocAlignMask) & ~allocAlignMask;
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}
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// Returns a pointer with alignment added.
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template <typename P>
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inline P* pointerAdjustedForAlignment (P* const p)
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{
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return reinterpret_cast <P*> (reinterpret_cast <char*> (p) +
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bytesNeededForAlignment (p));
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}
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}
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#endif
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