forked from bartvdbraak/blender
57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
/*
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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*
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*/
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#include "GEN_HashedPtr.h"
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#include "BLO_sys_types.h" // for intptr_t support
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//
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// Build hash index from pointer. Even though the final result
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// is a 32-bit integer, use all the bits of the pointer as long
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// as possible.
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//
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#if 1
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unsigned int GEN_Hash(void * inDWord)
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{
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uintptr_t key = (uintptr_t)inDWord;
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#if 0
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// this is way too complicated
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key += ~(key << 16);
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key ^= (key >> 5);
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key += (key << 3);
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key ^= (key >> 13);
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key += ~(key << 9);
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key ^= (key >> 17);
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return (unsigned int)(key & 0xffffffff);
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#else
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return (unsigned int)(key ^ (key>>4));
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#endif
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}
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#endif |