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ab6a873fe0
This patch adds SSSE3 strcpy/stpcpy. I got up to 4X speed up on Core 2 and Core i7. I disabled it on Atom since SSSE3 version is slower for shorter (<64byte) data.
102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/* Copyright (C) 1993, 1995, 1996, 1997, 2002 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* This is almost copied from strncpy.c, written by Torbjorn Granlund. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef _LIBC
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# include <string.h>
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#else
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# include <sys/types.h>
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#endif
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#ifndef STPNCPY
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# ifdef weak_alias
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# define STPNCPY __stpncpy
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weak_alias (__stpncpy, stpncpy)
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# else
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# define STPNCPY stpncpy
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# endif
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#endif
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/* Copy no more than N characters of SRC to DEST, returning the address of
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the terminating '\0' in DEST, if any, or else DEST + N. */
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char *
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STPNCPY (char *dest, const char *src, size_t n)
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{
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char c;
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char *s = dest;
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if (n >= 4)
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{
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size_t n4 = n >> 2;
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for (;;)
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{
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c = *src++;
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*dest++ = c;
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if (c == '\0')
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break;
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c = *src++;
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*dest++ = c;
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if (c == '\0')
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break;
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c = *src++;
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*dest++ = c;
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if (c == '\0')
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break;
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c = *src++;
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*dest++ = c;
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if (c == '\0')
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break;
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if (--n4 == 0)
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goto last_chars;
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}
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n -= dest - s;
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goto zero_fill;
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}
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last_chars:
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n &= 3;
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if (n == 0)
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return dest;
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for (;;)
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{
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c = *src++;
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--n;
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*dest++ = c;
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if (c == '\0')
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break;
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if (n == 0)
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return dest;
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}
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zero_fill:
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while (n-- > 0)
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dest[n] = '\0';
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return dest - 1;
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}
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#ifdef weak_alias
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libc_hidden_def (__stpncpy)
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#endif
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