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e3fd0b0e93
This allows an architecture to use the old generic implementation and also set explicit loop unrolling. Checked on aarch64-linux-gnu. * include/loop_unroll.h: New file. * wcsmbs/wcscpy (__wcscpy): Add option to use loop unrolling besides generic implementation.
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* Copyright (C) 1995-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
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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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#include <wchar.h>
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#include <loop_unroll.h>
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#ifdef WCSCPY
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# define __wcscpy WCSCPY
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#endif
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/* Copy SRC to DEST. */
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wchar_t *
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__wcscpy (wchar_t *dest, const wchar_t *src)
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{
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#ifndef UNROLL_NTIMES
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return __wmemcpy (dest, src, __wcslen (src) + 1);
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#else
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/* Some architectures might have costly tail function call (powerpc
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for instance) where wmemcpy call overhead for smalls sizes might
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be more costly than just unrolling the main loop. */
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wchar_t *wcp = dest;
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#define ITERATION(index) \
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({ \
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wchar_t c = *src++; \
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*wcp++ = c; \
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c != L'\0'; \
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})
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while (1)
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UNROLL_REPEAT(UNROLL_NTIMES, ITERATION);
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return dest;
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#endif
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}
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#ifndef WCSCPY
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weak_alias (__wcscpy, wcscpy)
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libc_hidden_def (__wcscpy)
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#endif
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