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update from GNU libc

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This commit is contained in:
Jim Meyering
1997-11-13 14:24:03 +00:00
parent e0d703658c
commit db984f4c6d
1 changed files with 57 additions and 37 deletions
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lib/memcmp.c
+57 -37
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@@ -1,72 +1,83 @@
/* Copyright (C) 1991, 1993, 1995 Free Software Foundation, Inc.
/* Copyright (C) 1991, 1993, 1995, 1997 Free Software Foundation, Inc.
Contributed by Torbjorn Granlund (tege@sics.se).
NOTE: The canonical source of this file is maintained with the GNU C Library.
Bugs can be reported to bug-glibc@prep.ai.mit.edu.
NOTE: The canonical source of this file is maintained with the GNU C Library.
Bugs can be reported to bug-glibc@prep.ai.mit.edu.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA. */
#ifdef HAVE_CONFIG_H
#include "config.h"
# include "config.h"
#endif
#undef __ptr_t
#if defined (__cplusplus) || (defined (__STDC__) && __STDC__)
#define __ptr_t void *
#if defined __cplusplus || (defined __STDC__ && __STDC__)
# define __ptr_t void *
#else /* Not C++ or ANSI C. */
#undef const
#define const
#define __ptr_t char *
# undef const
# define const
# define __ptr_t char *
#endif /* C++ or ANSI C. */
#if defined (HAVE_STRING_H) || defined (_LIBC)
#include <string.h>
#ifndef __P
# if defined __GNUC__ || (defined __STDC__ && __STDC__)
# define __P(args) args
# else
# define __P(args) ()
# endif /* GCC. */
#endif /* Not __P. */
#if defined HAVE_STRING_H || defined _LIBC
# include <string.h>
#endif
#undef memcmp
#ifdef _LIBC
#include <memcopy.h>
# include <memcopy.h>
#else /* Not in the GNU C library. */
#include <sys/types.h>
# include <sys/types.h>
/* Type to use for aligned memory operations.
This should normally be the biggest type supported by a single load
and store. Must be an unsigned type. */
#define op_t unsigned long int
#define OPSIZ (sizeof(op_t))
# define op_t unsigned long int
# define OPSIZ (sizeof(op_t))
/* Threshold value for when to enter the unrolled loops. */
#define OP_T_THRES 16
# define OP_T_THRES 16
/* Type to use for unaligned operations. */
typedef unsigned char byte;
#ifndef WORDS_BIGENDIAN
#define MERGE(w0, sh_1, w1, sh_2) (((w0) >> (sh_1)) | ((w1) << (sh_2)))
#else
#define MERGE(w0, sh_1, w1, sh_2) (((w0) << (sh_1)) | ((w1) >> (sh_2)))
#endif
# ifndef WORDS_BIGENDIAN
# define MERGE(w0, sh_1, w1, sh_2) (((w0) >> (sh_1)) | ((w1) << (sh_2)))
# else
# define MERGE(w0, sh_1, w1, sh_2) (((w0) << (sh_1)) | ((w1) >> (sh_2)))
# endif
#endif /* In the GNU C library. */
#ifdef WORDS_BIGENDIAN
#define CMP_LT_OR_GT(a, b) ((a) > (b) ? 1 : -1)
# define CMP_LT_OR_GT(a, b) ((a) > (b) ? 1 : -1)
#else
#define CMP_LT_OR_GT(a, b) memcmp_bytes ((a), (b))
# define CMP_LT_OR_GT(a, b) memcmp_bytes ((a), (b))
#endif
/* BE VERY CAREFUL IF YOU CHANGE THIS CODE! */
@@ -86,9 +97,12 @@ typedef unsigned char byte;
/* memcmp_bytes -- Compare A and B bytewise in the byte order of the machine.
A and B are known to be different.
This is needed only on little-endian machines. */
#ifdef __GNUC__
static int memcmp_bytes __P((op_t, op_t));
# ifdef __GNUC__
__inline
#endif
# endif
static int
memcmp_bytes (a, b)
op_t a, b;
@@ -109,6 +123,8 @@ memcmp_bytes (a, b)
}
#endif
static int memcmp_common_alignment __P((long, long, size_t));
/* memcmp_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN `op_t'
objects (not LEN bytes!). Both SRCP1 and SRCP2 should be aligned for
memory operations on `op_t's. */
@@ -126,6 +142,7 @@ memcmp_common_alignment (srcp1, srcp2, len)
switch (len % 4)
{
default: /* Avoid warning about uninitialized local variables. */
case 2:
a0 = ((op_t *) srcp1)[0];
b0 = ((op_t *) srcp2)[0];
@@ -196,6 +213,8 @@ memcmp_common_alignment (srcp1, srcp2, len)
return 0;
}
static int memcmp_not_common_alignment __P((long, long, size_t));
/* memcmp_not_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN
`op_t' objects (not LEN bytes!). SRCP2 should be aligned for memory
operations on `op_t', but SRCP1 *should be unaligned*. */
@@ -225,6 +244,7 @@ memcmp_not_common_alignment (srcp1, srcp2, len)
switch (len % 4)
{
default: /* Avoid warning about uninitialized local variables. */
case 2:
a1 = ((op_t *) srcp1)[0];
a2 = ((op_t *) srcp1)[1];
@@ -366,6 +386,6 @@ memcmp (s1, s2, len)
}
#ifdef weak_alias
#undef bcmp
# undef bcmp
weak_alias (memcmp, bcmp)
#endif