508bf2b45a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24158 a1c6a512-1295-4272-9138-f99709370657
79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 by Jens Arnold
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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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <string.h>
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#include "memory.h"
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#define LBLOCKSIZE (sizeof(long)/2)
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#define UNALIGNED(X) ((long)X & (sizeof(long) - 1))
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#define TOO_SMALL(LEN) ((LEN) < LBLOCKSIZE)
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void memset16(void *dst, int val, size_t len)
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{
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#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
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unsigned short *p = (unsigned short *)dst;
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while (len--)
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*p++ = val;
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#else
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unsigned short *p = (unsigned short *)dst;
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unsigned int i;
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unsigned long buffer;
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unsigned long *aligned_addr;
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if (!TOO_SMALL(len) && !UNALIGNED(dst))
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{
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aligned_addr = (unsigned long *)dst;
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val &= 0xffff;
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if (LBLOCKSIZE == 2)
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{
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buffer = (val << 16) | val;
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}
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else
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{
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buffer = 0;
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for (i = 0; i < LBLOCKSIZE; i++)
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buffer = (buffer << 16) | val;
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}
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while (len >= LBLOCKSIZE*4)
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{
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*aligned_addr++ = buffer;
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*aligned_addr++ = buffer;
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*aligned_addr++ = buffer;
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*aligned_addr++ = buffer;
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len -= 4*LBLOCKSIZE;
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}
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while (len >= LBLOCKSIZE)
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{
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*aligned_addr++ = buffer;
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len -= LBLOCKSIZE;
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}
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p = (unsigned short *)aligned_addr;
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}
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while (len--)
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*p++ = val;
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#endif /* not PREFER_SIZE_OVER_SPEED */
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}
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