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80 lines
1.4 KiB
80 lines
1.4 KiB
/* |
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* Copyright (C) 2011 Tobias Klauser <[email protected]> |
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* Copyright (C) 2004 Microtronix Datacom Ltd |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/types.h> |
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#include <linux/string.h> |
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void *memmove(void *d, const void *s, size_t count) |
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{ |
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unsigned long dst, src; |
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if (!count) |
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return d; |
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if (d < s) { |
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dst = (unsigned long) d; |
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src = (unsigned long) s; |
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if ((count < 8) || ((dst ^ src) & 3)) |
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goto restup; |
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if (dst & 1) { |
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*(char *)dst++ = *(char *)src++; |
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count--; |
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} |
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if (dst & 2) { |
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*(short *)dst = *(short *)src; |
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src += 2; |
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dst += 2; |
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count -= 2; |
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} |
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while (count > 3) { |
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*(long *)dst = *(long *)src; |
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src += 4; |
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dst += 4; |
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count -= 4; |
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} |
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restup: |
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while (count--) |
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*(char *)dst++ = *(char *)src++; |
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} else { |
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dst = (unsigned long) d + count; |
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src = (unsigned long) s + count; |
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if ((count < 8) || ((dst ^ src) & 3)) |
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goto restdown; |
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if (dst & 1) { |
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src--; |
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dst--; |
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count--; |
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*(char *)dst = *(char *)src; |
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} |
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if (dst & 2) { |
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src -= 2; |
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dst -= 2; |
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count -= 2; |
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*(short *)dst = *(short *)src; |
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} |
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while (count > 3) { |
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src -= 4; |
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dst -= 4; |
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count -= 4; |
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*(long *)dst = *(long *)src; |
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} |
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restdown: |
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while (count--) { |
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src--; |
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dst--; |
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*(char *)dst = *(char *)src; |
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} |
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} |
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return d; |
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}
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