[thirdparty/glibc.git] / sysdeps / s390 / bits / string.h

/* Optimized, inlined string functions.  S/390 version.
   Copyright (C) 2000, 2001 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, 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

#ifndef __STRING_INLINE
# ifdef __cplusplus
#  define __STRING_INLINE inline
# else
#  define __STRING_INLINE extern __inline
# endif
#endif

#define _HAVE_STRING_ARCH_strlen 1
#ifndef _FORCE_INLINES
__STRING_INLINE size_t
strlen (__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
__STRING_INLINE char *
strcpy (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
__STRING_INLINE char *
strncpy (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
__STRING_INLINE char *
strcat(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
__STRING_INLINE char *
strncat (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

/* Search N bytes of S for C.  */
#define _HAVE_STRING_ARCH_memchr 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.  */
Commit	Line	Data
0a51f0ac UD	1	/* Optimized, inlined string functions. S/390 version.
	2	Copyright (C) 2000, 2001 Free Software Foundation, Inc.
	3	Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
	4	This file is part of the GNU C Library.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
0a51f0ac UD	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
41bdb6e2 AJ	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2 AJ	14	Lesser General Public License for more details.
0a51f0ac	15
41bdb6e2 AJ	16	You should have received a copy of the GNU Lesser General Public
	17	License along with the GNU C Library; if not, write to the Free
	18	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	19	02111-1307 USA. */
0a51f0ac UD	20
	21	#ifndef _STRING_H
	22	# error "Never use <bits/string.h> directly; include <string.h> instead."
	23	#endif
	24
	25	/* The s390 processors can access unaligned multi-byte variables. */
	26	#define _STRING_ARCH_unaligned 1
	27
	28	/* We only provide optimizations if the user selects them and if
	29	GNU CC is used. */
	30	#if !defined __NO_STRING_INLINES && defined __USE_STRING_INLINES \
	31	&& defined __GNUC__ && __GNUC__ >= 2
	32
	33	#ifndef __STRING_INLINE
	34	# ifdef __cplusplus
	35	# define __STRING_INLINE inline
	36	# else
	37	# define __STRING_INLINE extern __inline
	38	# endif
	39	#endif
	40
	41	#define _HAVE_STRING_ARCH_strlen 1
	42	#ifndef _FORCE_INLINES
	43	__STRING_INLINE size_t
	44	strlen (__const char *__str)
	45	{
	46	char __ptr, __tmp;
	47
	48	__ptr = (char *) 0;
	49	__tmp = (char *) __str;
	50	__asm__ __volatile__ (" la 0,0\n"
	51	"0: srst %0,%1\n"
	52	" jo 0b\n"
	53	: "+&a" (__ptr), "+&a" (__tmp) :
0ecb606c	54	: "cc", "memory", "0" );
0a51f0ac UD	55	return (size_t) (__ptr - __str);
	56	}
	57	#endif
	58
	59	/* Copy SRC to DEST. */
	60	#define _HAVE_STRING_ARCH_strcpy 1
	61	#ifndef _FORCE_INLINES
	62	__STRING_INLINE char *
	63	strcpy (char __dest, __const char __src)
	64	{
	65	char *tmp = __dest;
	66
	67	__asm__ __volatile__ (" la 0,0\n"
	68	"0: mvst %0,%1\n"
	69	" jo 0b"
	70	: "+&a" (__dest), "+&a" (__src) :
	71	: "cc", "memory", "0" );
	72	return tmp;
	73	}
	74	#endif
	75
	76	#define _HAVE_STRING_ARCH_strncpy 1
	77	#ifndef _FORCE_INLINES
	78	__STRING_INLINE char *
	79	strncpy (char __dest, __const char __src, size_t __n)
	80	{
	81	char *__ret = __dest;
	82	char *__ptr;
	83	size_t __diff;
	84
	85	if (__n > 0) {
	86	__diff = (size_t) (__dest - __src);
	87	__ptr = (char *) __src;
	88	__asm__ __volatile__ (" j 1f\n"
	89	"0: la %0,1(%0)\n"
	90	"1: icm 0,1,0(%0)\n"
	91	" stc 0,0(%2,%0)\n"
	92	" jz 3f\n"
	93	#if defined(__s390x__)
	94	" brctg %1,0b\n"
	95	#else
	96	" brct %1,0b\n"
	97	#endif
	98	" j 4f\n"
	99	"2: la %0,1(%0)\n"
	100	" stc 0,0(%2,%0)\n"
	101	#if defined(__s390x__)
	102	"3: brctg %1,2b\n"
	103	#else
	104	"3: brct %1,2b\n"
	105	#endif
	106	"4:"
	107	: "+&a" (__ptr), "+&a" (__n) : "a" (__diff)
0ecb606c	108	: "cc", "memory", "0" );
0a51f0ac UD	109	}
	110	return __ret;
	111	}
	112	#endif
	113
	114	/* Append SRC onto DEST. */
	115	#define _HAVE_STRING_ARCH_strcat 1
	116	#ifndef _FORCE_INLINES
	117	__STRING_INLINE char *
	118	strcat(char __dest, const char __src)
	119	{
	120	char *__ret = __dest;
	121	char __ptr, __tmp;
	122
	123	/* Move __ptr to the end of __dest. */
	124	__ptr = (char *) 0;
	125	__tmp = __dest;
	126	__asm__ __volatile__ (" la 0,0\n"
	127	"0: srst %0,%1\n"
	128	" jo 0b\n"
	129	: "+&a" (__ptr), "+&a" (__tmp) :
	130	: "cc", "0" );
	131
	132	/* Now do the copy. */
	133	__asm__ __volatile__ (" la 0,0\n"
	134	"0: mvst %0,%1\n"
	135	" jo 0b"
	136	: "+&a" (__ptr), "+&a" (__src) :
0ecb606c	137	: "cc", "memory", "0" );
0a51f0ac UD	138	return __ret;
	139	}
	140	#endif
	141
	142	/* Append no more than N characters from SRC onto DEST. */
	143	#define _HAVE_STRING_ARCH_strncat 1
	144	#ifndef _FORCE_INLINES
	145	__STRING_INLINE char *
	146	strncat (char __dest, __const char __src, size_t __n)
	147	{
	148	char *__ret = __dest;
	149	char __ptr, __tmp;
	150	size_t __diff;
	151
	152	if (__n > 0) {
	153	/* Move __ptr to the end of __dest. */
	154	__ptr = (char *) 0;
	155	__tmp = __dest;
	156	__asm__ __volatile__ (" la 0,0\n"
	157	"0: srst %0,%1\n"
	158	" jo 0b\n"
	159	: "+&a" (__ptr), "+&a" (__tmp) :
0ecb606c	160	: "cc", "memory", "0" );
0a51f0ac UD	161
	162	__diff = (size_t) (__ptr - __src);
	163	__tmp = (char *) __src;
	164	__asm__ __volatile__ (" j 1f\n"
	165	"0: la %0,1(%0)\n"
	166	"1: icm 0,1,0(%0)\n"
	167	" stc 0,0(%2,%0)\n"
	168	" jz 2f\n"
	169	#if defined(__s390x__)
	170	" brctg %1,0b\n"
	171	#else
	172	" brct %1,0b\n"
	173	#endif
	174	" slr 0,0\n"
	175	" stc 0,1(%2,%0)\n"
	176	"2:"
	177	: "+&a" (__tmp), "+&a" (__n) : "a" (__diff)
0ecb606c	178	: "cc", "memory", "0" );
0a51f0ac UD	179
	180	}
	181	return __ret;
	182	}
	183	#endif
	184
	185	/* Search N bytes of S for C. */
	186	#define _HAVE_STRING_ARCH_memchr 1
	187	#ifndef _FORCE_INLINES
	188	__STRING_INLINE void *
	189	memchr (__const void *__str, int __c, size_t __n)
	190	{
	191	char __ptr, __tmp;
	192
	193	__tmp = (char *) __str;
	194	__ptr = (char *) __tmp + __n;
	195	__asm__ __volatile__ (" lhi 0,0xff\n"
	196	" nr 0,%2\n"
	197	"0: srst %0,%1\n"
	198	" jo 0b\n"
	199	" brc 13,1f\n"
	200	" la %0,0\n"
	201	"1:"
	202	: "+&a" (__ptr), "+&a" (__tmp) : "d" (__c)
0ecb606c	203	: "cc", "memory", "0" );
0a51f0ac UD	204	return __ptr;
	205	}
	206	#endif
	207
	208	/* Search N bytes of S for C. */
	209	#define _HAVE_STRING_ARCH_memchr 1
	210	#ifndef _FORCE_INLINES
	211	__STRING_INLINE int
	212	strcmp (__const char __s1, __const char __s2)
	213	{
	214	char __p1, __p2;
	215	int __ret;
	216
	217	__p1 = (char *) __s1;
	218	__p2 = (char *) __s2;
	219	__asm__ __volatile__ (" slr 0,0\n"
	220	"0: clst %1,%2\n"
	221	" jo 0b\n"
	222	" ipm %0\n"
	223	" srl %0,28"
	224	: "=d" (__ret), "+&a" (__p1), "+&a" (__p2) :
0ecb606c	225	: "cc", "memory", "0" );
0a51f0ac UD	226	__ret = (__ret == 0) ? 0 : (__ret == 1) ? -1 : 1;
	227	return __ret;
	228	}
	229	#endif
	230
	231	#endif /* Use string inlines && GNU CC. */