1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/* Optimized, inlined string functions. s390 version.
Copyright (C) 2000 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _STRING_H
# error "Never use <bits/string.h> directly; include <string.h> instead."
#endif
/* The s390 processors can access unaligned multi-byte variables. */
#define _STRING_ARCH_unaligned 1
/* We only provide optimizations if the user selects them and if
GNU CC is used. */
#if !defined __NO_STRING_INLINES && defined __USE_STRING_INLINES \
&& defined __GNUC__ && __GNUC__ >= 2
#ifdef __cplusplus
# define __STRING_INLINE inline
#else
# define __STRING_INLINE extern __inline
#endif
#define _HAVE_STRING_ARCH_strlen 1
__STRING_INLINE size_t
strlen (__const char *__str)
{
size_t __len;
__asm__ __volatile__ (" sr 0,0\n"
" lr %0,%1\n"
"0: srst 0,%0\n"
" jo 0b\n"
" lr %0,0\n"
" sr %0,%1"
: "=&a" (__len) : "a" (__str)
: "cc", "0" );
return __len;
}
/* Copy SRC to DEST. */
#define _HAVE_STRING_ARCH_strcpy 1
__STRING_INLINE char *
strcpy (char *__dest, __const char *__src)
{
char *tmp = __dest;
__asm__ __volatile__ (" sr 0,0\n"
"0: mvst %0,%1\n"
" jo 0b"
: "+&a" (__dest), "+&a" (__src) :
: "cc", "memory", "0" );
return tmp;
}
#define _HAVE_STRING_ARCH_strncpy 1
__STRING_INLINE char *
strncpy (char *__dest, __const char *__src, size_t __n)
{
char *tmp = __dest;
if (__n <= 0)
return tmp;
__asm__ __volatile (" slr %0,%1\n"
"0: icm 0,1,0(%1)\n"
" stc 0,0(%0,%1)\n"
" jz 2f\n"
" la %1,1(%1)\n"
" brct %2,0b\n"
" j 3f\n"
"1: la %1,1(%1)\n"
" stc 0,0(%0,%1)\n"
"2: brct %2,1b\n"
"3:"
: "+&a" (__dest), "+&a" (__src), "+&d" (__n) :
: "cc", "memory", "0" );
return tmp;
}
/* Append SRC onto DEST. */
#define _HAVE_STRING_ARCH_strcat 1
__STRING_INLINE char *
strcat(char *__dest, const char *__src)
{
char *tmp = __dest;
__asm__ __volatile__ (" sr 0,0\n"
"0: srst 0,%0\n"
" jo 0b\n"
" lr %0,0\n"
" sr 0,0\n"
"1: mvst %0,%1\n"
" jo 1b"
: "+&a" (__dest), "+&a" (__src) :
: "cc", "memory", "0" );
return tmp;
}
/* Append no more than N characters from SRC onto DEST. */
#define _HAVE_STRING_ARCH_strncat 1
__STRING_INLINE char *
strncat (char *__dest, __const char *__src, size_t __n)
{
char *tmp = __dest;
if (__n <= 0)
return tmp;
__asm__ __volatile__ (" sr 0,0\n"
"0: srst 0,%0\n"
" jo 0b\n"
" lr %0,0\n"
" slr %0,%1\n"
"1: icm 0,1,0(%1)\n"
" stc 0,0(%0,%1)\n"
" jz 2f\n"
" la %1,1(%1)\n"
" brct %2,1b\n"
" la %0,0(%0,%1)\n"
" xc 0(1,%0),0(%0\n)"
"2:"
: "+&a" (__dest), "+&a" (__src), "+&d" (__n) :
: "cc", "memory", "0" );
return tmp;
}
#endif /* Use string inlines && GNU CC. */
|
