/* strcat (dest, src) -- Append SRC on the end of DEST.

   For SPARC v7.

   Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Jakub Jelinek <jj@ultra.linux.cz>.

   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/>.  */

#include <sysdep.h>

	/* Normally, this uses ((xword - 0x01010101) & 0x80808080) test

	   to find out if any byte in xword could be zero. This is fast, but

	   also gives false alarm for any byte in range 0x81-0xff. It does

	   not matter for correctness, as if this test tells us there could

	   be some zero byte, we check it byte by byte, but if bytes with

	   high bits set are common in the strings, then this will give poor

	   performance. You can #define EIGHTBIT_NOT_RARE and the algorithm

	   will use one tick slower, but more precise test

	   ((xword - 0x01010101) & (~xword) & 0x80808080),

	   which does not give any false alarms (but if some bits are set,

	   one cannot assume from it which bytes are zero and which are not).

	   It is yet to be measured, what is the correct default for glibc

	   in these days for an average user.

	 */

	.text

	.align		4

ENTRY(strcat)

	mov		%o0, %g2

	andcc		%o0, 3, %g0

	be		30f

	 sethi		%hi(0x80808080), %o4

	ldub		[%o0], %o5

	cmp		%o5, 0

	be		1f

	 add		%o0, 1, %o0

	andcc		%o0, 3, %g0

	be		7f

	 or		%o4, %lo(0x80808080), %o3

	ldub		[%o0], %o5

	cmp		%o5, 0

	be		2f

	 add		%o0, 1, %o0

	andcc		%o0, 3, %g0

	be		8f

	 sethi		%hi(0x01010101), %o4

	ldub		[%o0], %o5

	cmp		%o5, 0

	be		3f

	 add		%o0, 1, %o0

	b		9f

	 or		%o4, %lo(0x01010101), %o2

1:	or		%o4, %lo(0x80808080), %o3

2:	sethi		%hi(0x01010101), %o4

3:	or		%o4, %lo(0x01010101), %o2

	b		3f

	 sub		%o0, 1, %o0

30:	or		%o4, %lo(0x80808080), %o3

7:	sethi		%hi(0x01010101), %o4

8:	or		%o4, %lo(0x01010101), %o2

9:	ld		[%o0], %o5

7:	sub		%o5, %o2, %o4

#ifdef EIGHTBIT_NOT_RARE

	andn		%o4, %o5, %o4

#endif

	andcc		%o4, %o3, %g0

	be		9b

	 add		%o0, 4, %o0

	srl		%o5, 24, %g5

	andcc		%g5, 0xff, %g0

	be		3f

	 add		%o0, -4, %o0

	srl		%o5, 16, %g5

	andcc		%g5, 0xff, %g0

	be		3f

	 add		%o0, 1, %o0

	srl		%o5, 8, %g5

	andcc		%g5, 0xff, %g0

	be		3f

	 add		%o0, 1, %o0

	andcc		%o5, 0xff, %g0

	add		%o0, 2, %o0

	bne,a		7b

	 ld		[%o0], %o5

	sub		%o0, 1, %o0

3:	andcc		%o1, 3, %o4

	be		4f

	 nop

	cmp		%o4, 2

	be		11f

	 cmp		%o4, 3

	ldub		[%o1], %o5

	add		%o1, 1, %o1

	stb		%o5, [%o0]

	be		13f

	 cmp		%o5, 0

	be		0f

	 add		%o0, 1, %o0

11:	lduh		[%o1], %o5

	add		%o1, 2, %o1

	srl		%o5, 8, %o4

	cmp		%o4, 0

	stb		%o4, [%o0]

	bne,a		12f

	 stb		%o5, [%o0 + 1]

	retl

	 mov		%g2, %o0

12:	andcc		%o5, 0xff, %o5

	bne		4f

	 add		%o0, 2, %o0

	retl

	 mov 		%g2, %o0

13:	bne		4f

	 add		%o0, 1, %o0

	retl

	 mov		%g2, %o0

4:	andcc		%o0, 3, %g3

	bne		12f

1:	ld		[%o1], %o5

	add		%o1, 4, %o1

	sub		%o5, %o2, %o4

#ifdef EIGHTBIT_NOT_RARE

	andn		%o4, %o5, %o4

#endif

	add		%o0, 4, %o0

	andcc		%o4, %o3, %g0

	be,a		1b

	 st		%o5, [%o0 - 4]

	srl		%o5, 24, %g5

	andcc		%g5, 0xff, %g0

	be		1f

	 srl		%o5, 16, %g5

	andcc		%g5, 0xff, %g0

	be		2f

	 srl		%o5, 8, %g5

	andcc		%g5, 0xff, %g0

	be		3f

	 andcc		%o5, 0xff, %g0

	bne		1b

	 st		%o5, [%o0 - 4]

	retl

	 mov		%g2, %o0

3:	srl		%o5, 16, %o5

	sth		%o5, [%o0 - 4]

	stb		%g0, [%o0 - 2]

	retl

	 mov		%g2, %o0

2:	srl		%o5, 16, %o5

	sth		%o5, [%o0 - 4]

	retl

	 mov		%g2, %o0

1:	stb		%g0, [%o0 - 4]

	retl

	 mov		%g2, %o0

12:	add		%o1, 4, %o1

	sub		%o5, %o2, %o4

	cmp		%g3, 2

	be		2f

	 cmp		%g3, 3

	be		3f

	 andcc		%o4, %o3, %g0

	bne		5f

	 srl		%o5, 24, %g5

	stb		%g5, [%o0]

	sub		%o0, 1, %o0

	srl		%o5, 8, %g5

	sth		%g5, [%o0 + 2]

1:	add		%o0, 4, %o0

4:	sll		%o5, 24, %g6

	ld		[%o1], %o5

	add		%o1, 4, %o1

	srl		%o5, 8, %g5

	sub		%o5, %o2, %o4

#ifdef EIGHTBIT_NOT_RARE

	andn		%o4, %o5, %o4

#endif

	or		%g5, %g6, %g5

	andcc		%o4, %o3, %g0

	be,a		1b

	 st		%g5, [%o0]

	srl		%o5, 24, %o4

	andcc		%o4, 0xff, %g0

	be		6f

	 srl		%o5, 16, %o4

	andcc		%o4, 0xff, %g0

	be		7f

	 srl		%o5, 8, %o4

	st		%g5, [%o0]

	andcc		%o4, 0xff, %g0

	be		0f

	 andcc		%o5, 0xff, %g0

1:	bne		4b

	 add		%o0, 4, %o0

9:	stb		%g0, [%o0]

0:	retl

	 mov		%g2, %o0

6:	srl		%g5, 16, %g5

	sth		%g5, [%o0]

	retl

	 mov		%g2, %o0

7:	srl		%g5, 16, %g5

	sth		%g5, [%o0]

	stb		%g0, [%o0 + 2]

	retl

	 mov		%g2, %o0

5:	andcc		%g5, 0xff, %g4

	be		9b

	 srl		%o5, 16, %g5

	andcc		%g5, 0xff, %g0

	be		7f

	 srl		%o5, 8, %g5

	andcc		%g5, 0xff, %g0

	stb		%g4, [%o0]

	sth		%g5, [%o0 + 1]

	sub		%o0, 1, %o0

	bne		1b

	 andcc		%o5, 0xff, %g0

	retl

	 mov		%g2, %o0

7:	stb		%g4, [%o0]

	stb		%g0, [%o0 + 1]

	retl

	 mov		%g2, %o0

2:	andcc		%o4, %o3, %g0

	bne		5f

	 srl		%o5, 16, %g5

	sth		%g5, [%o0]

	sub		%o0, 2, %o0

1:	add		%o0, 4, %o0

4:	sll		%o5, 16, %g6

	ld		[%o1], %o5

	add		%o1, 4, %o1

	srl		%o5, 16, %g5

	sub		%o5, %o2, %o4

#ifdef EIGHTBIT_NOT_RARE

	andn		%o4, %o5, %o4

#endif

	or		%g5, %g6, %g5

	andcc		%o4, %o3, %g0

	be,a		1b

	 st		%g5, [%o0]

	srl		%o5, 24, %o4

	andcc		%o4, 0xff, %g0

	be		7f

	 srl		%o5, 16, %o4

	st		%g5, [%o0]

	andcc		%o4, 0xff, %g0

	be		0b

	 srl		%o5, 8, %o4

1:	andcc		%o4, 0xff, %g0

	be		8f

	 andcc		%o5, 0xff, %g0

	bne		4b

	 add		%o0, 4, %o0

	sth		%o5, [%o0]

	retl

	 mov		%g2, %o0

7:	srl		%g5, 16, %g5

	sth		%g5, [%o0]

	stb		%g0, [%o0 + 2]

	retl

	 mov		%g2, %o0

8:	stb		%g0, [%o0 + 4]

	retl

	 mov		%g2, %o0

5:	srl		%o5, 24, %g5

	andcc		%g5, 0xff, %g0

	be		9b

	 srl		%o5, 16, %g5

	andcc		%g5, 0xff, %g0

	sth		%g5, [%o0]

	sub		%o0, 2, %o0

	bne		1b

	 srl		%o5, 8, %o4

	retl

	 mov		%g2, %o0

3:	bne		5f

	 srl		%o5, 24, %g5

	stb		%g5, [%o0]

	sub		%o0, 3, %o0

1:	add		%o0, 4, %o0

4:	sll		%o5, 8, %g6

	ld		[%o1], %o5

	add		%o1, 4, %o1

	srl		%o5, 24, %g5

	sub		%o5, %o2, %o4

#ifdef EIGHTBIT_NOT_RARE

	andn		%o4, %o5, %o4

#endif

	or		%g5, %g6, %g5

	andcc		%o4, %o3, %g0

	be		1b

	 st		%g5, [%o0]

	srl		%o5, 24, %o4

	andcc		%o4, 0xff, %g0

	be		0b

	 srl		%o5, 16, %o4

1:	andcc		%o4, 0xff, %g0

	be		8b

	 srl		%o5, 8, %o4

	andcc		%o4, 0xff, %g0

	be		9f

	 andcc		%o5, 0xff, %g0

	bne		4b

	 add		%o0, 4, %o0

	srl		%o5, 8, %o5

	sth		%o5, [%o0]

	stb		%g0, [%o0 + 2]

	retl

	 mov		%g2, %o0

9:	srl		%o5, 8, %o5

	sth		%o5, [%o0 + 4]

	retl

	 mov		%g2, %o0

5:	andcc		%g5, 0xff, %g0

	stb		%g5, [%o0]

	sub		%o0, 3, %o0

	bne		1b

	 srl		%o5, 16, %o4

	retl

	 mov		%g2, %o0

END(strcat)

libc_hidden_builtin_def (strcat)