Blame sysdeps/generic/pagecopy.h

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/* Macros for copying by pages; used in memcpy, memmove.
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   Copyright (C) 1995-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library 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 GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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/* The macro PAGE_COPY_FWD_MAYBE defined in memcopy.h is used in memmove if the
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   PAGE_COPY_THRESHOLD macro is set to a non-zero value.  The default is 0,
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   that is copying by pages is not implemented.
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   System-specific pagecopy.h files that want to support page copying should
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   define these macros:
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   PAGE_COPY_THRESHOLD
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   -- A non-zero minimum size for which virtual copying by pages is worthwhile.
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   PAGE_SIZE
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   -- Size of a page.
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   PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes)
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   -- Macro to perform the virtual copy operation.
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   The pointers will be aligned to PAGE_SIZE bytes.
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*/
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#define PAGE_COPY_THRESHOLD 0