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glibc/sysdeps/s390/bits/string.h
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/* Optimized, inlined string functions. S/390 version. | |
Copyright (C) 2000-2016 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 Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifndef _STRING_H | |
# error "Never use <bits/string.h> directly; include <string.h> instead." | |
#endif | |
/* Use the unaligned string inline ABI. */ | |
#define _STRING_INLINE_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 | |
#ifndef __STRING_INLINE | |
# ifndef __extern_inline | |
# define __STRING_INLINE inline | |
# else | |
# define __STRING_INLINE __extern_inline | |
# endif | |
#endif | |
#define _HAVE_STRING_ARCH_strlen 1 | |
#ifndef _FORCE_INLINES | |
#define strlen(str) __strlen_g ((str)) | |
__STRING_INLINE size_t __strlen_g (const char *) __asm__ ("strlen"); | |
__STRING_INLINE size_t | |
__strlen_g (const char *__str) | |
{ | |
char *__ptr, *__tmp; | |
__ptr = (char *) 0; | |
__tmp = (char *) __str; | |
__asm__ __volatile__ (" la 0,0\n" | |
"0: srst %0,%1\n" | |
" jo 0b\n" | |
: "+&a" (__ptr), "+&a" (__tmp) : | |
: "cc", "memory", "0" ); | |
return (size_t) (__ptr - __str); | |
} | |
#endif | |
/* Copy SRC to DEST. */ | |
#define _HAVE_STRING_ARCH_strcpy 1 | |
#ifndef _FORCE_INLINES | |
#define strcpy(dest, src) __strcpy_g ((dest), (src)) | |
__STRING_INLINE char *__strcpy_g (char *, const char *) __asm__ ("strcpy"); | |
__STRING_INLINE char * | |
__strcpy_g (char *__dest, const char *__src) | |
{ | |
char *tmp = __dest; | |
__asm__ __volatile__ (" la 0,0\n" | |
"0: mvst %0,%1\n" | |
" jo 0b" | |
: "+&a" (__dest), "+&a" (__src) : | |
: "cc", "memory", "0" ); | |
return tmp; | |
} | |
#endif | |
#define _HAVE_STRING_ARCH_strncpy 1 | |
#ifndef _FORCE_INLINES | |
#define strncpy(dest, src, n) __strncpy_g ((dest), (src), (n)) | |
__STRING_INLINE char *__strncpy_g (char *, const char *, size_t) | |
__asm__ ("strncpy"); | |
__STRING_INLINE char * | |
__strncpy_g (char *__dest, const char *__src, size_t __n) | |
{ | |
char *__ret = __dest; | |
char *__ptr; | |
size_t __diff; | |
if (__n > 0) { | |
__diff = (size_t) (__dest - __src); | |
__ptr = (char *) __src; | |
__asm__ __volatile__ (" j 1f\n" | |
"0: la %0,1(%0)\n" | |
"1: icm 0,1,0(%0)\n" | |
" stc 0,0(%2,%0)\n" | |
" jz 3f\n" | |
#if defined(__s390x__) | |
" brctg %1,0b\n" | |
#else | |
" brct %1,0b\n" | |
#endif | |
" j 4f\n" | |
"2: la %0,1(%0)\n" | |
" stc 0,0(%2,%0)\n" | |
#if defined(__s390x__) | |
"3: brctg %1,2b\n" | |
#else | |
"3: brct %1,2b\n" | |
#endif | |
"4:" | |
: "+&a" (__ptr), "+&a" (__n) : "a" (__diff) | |
: "cc", "memory", "0" ); | |
} | |
return __ret; | |
} | |
#endif | |
/* Append SRC onto DEST. */ | |
#define _HAVE_STRING_ARCH_strcat 1 | |
#ifndef _FORCE_INLINES | |
#define strcat(dest, src) __strcat_g ((dest), (src)) | |
__STRING_INLINE char *__strcat_g (char *, const char *) __asm__ ("strcat"); | |
__STRING_INLINE char * | |
__strcat_g (char *__dest, const char *__src) | |
{ | |
char *__ret = __dest; | |
char *__ptr, *__tmp; | |
/* Move __ptr to the end of __dest. */ | |
__ptr = (char *) 0; | |
__tmp = __dest; | |
__asm__ __volatile__ (" la 0,0\n" | |
"0: srst %0,%1\n" | |
" jo 0b\n" | |
: "+&a" (__ptr), "+&a" (__tmp) : | |
: "cc", "0" ); | |
/* Now do the copy. */ | |
__asm__ __volatile__ (" la 0,0\n" | |
"0: mvst %0,%1\n" | |
" jo 0b" | |
: "+&a" (__ptr), "+&a" (__src) : | |
: "cc", "memory", "0" ); | |
return __ret; | |
} | |
#endif | |
/* Append no more than N characters from SRC onto DEST. */ | |
#define _HAVE_STRING_ARCH_strncat 1 | |
#ifndef _FORCE_INLINES | |
#define strncat(dest, src, n) __strncat_g ((dest), (src), (n)) | |
__STRING_INLINE char *__strncat_g (char *, const char *, size_t) | |
__asm__ ("strncat"); | |
__STRING_INLINE char * | |
__strncat_g (char *__dest, const char *__src, size_t __n) | |
{ | |
char *__ret = __dest; | |
char *__ptr, *__tmp; | |
size_t __diff; | |
if (__n > 0) { | |
/* Move __ptr to the end of __dest. */ | |
__ptr = (char *) 0; | |
__tmp = __dest; | |
__asm__ __volatile__ (" la 0,0\n" | |
"0: srst %0,%1\n" | |
" jo 0b\n" | |
: "+&a" (__ptr), "+&a" (__tmp) : | |
: "cc", "memory", "0" ); | |
__diff = (size_t) (__ptr - __src); | |
__tmp = (char *) __src; | |
__asm__ __volatile__ (" j 1f\n" | |
"0: la %0,1(%0)\n" | |
"1: icm 0,1,0(%0)\n" | |
" stc 0,0(%2,%0)\n" | |
" jz 2f\n" | |
#if defined(__s390x__) | |
" brctg %1,0b\n" | |
#else | |
" brct %1,0b\n" | |
#endif | |
" slr 0,0\n" | |
" stc 0,1(%2,%0)\n" | |
"2:" | |
: "+&a" (__tmp), "+&a" (__n) : "a" (__diff) | |
: "cc", "memory", "0" ); | |
} | |
return __ret; | |
} | |
#endif | |
/* Search N bytes of S for C. */ | |
#define _HAVE_STRING_ARCH_memchr 1 | |
#ifndef _FORCE_INLINES | |
__STRING_INLINE void * | |
memchr (const void *__str, int __c, size_t __n) | |
{ | |
char *__ptr, *__tmp; | |
__tmp = (char *) __str; | |
__ptr = (char *) __tmp + __n; | |
__asm__ __volatile__ (" lhi 0,0xff\n" | |
" nr 0,%2\n" | |
"0: srst %0,%1\n" | |
" jo 0b\n" | |
" brc 13,1f\n" | |
" la %0,0\n" | |
"1:" | |
: "+&a" (__ptr), "+&a" (__tmp) : "d" (__c) | |
: "cc", "memory", "0" ); | |
return __ptr; | |
} | |
#endif | |
/* Compare S1 and S2. */ | |
#define _HAVE_STRING_ARCH_strcmp 1 | |
#ifndef _FORCE_INLINES | |
__STRING_INLINE int | |
strcmp (const char *__s1, const char *__s2) | |
{ | |
char *__p1, *__p2; | |
int __ret; | |
__p1 = (char *) __s1; | |
__p2 = (char *) __s2; | |
__asm__ __volatile__ (" slr 0,0\n" | |
"0: clst %1,%2\n" | |
" jo 0b\n" | |
" ipm %0\n" | |
" srl %0,28" | |
: "=d" (__ret), "+&a" (__p1), "+&a" (__p2) : | |
: "cc", "memory", "0" ); | |
__ret = (__ret == 0) ? 0 : (__ret == 1) ? -1 : 1; | |
return __ret; | |
} | |
#endif | |
#endif /* Use string inlines && GNU CC. */ |