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61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 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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