/* Copy SRC to DEST returning the address of the terminating '\0' in 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(__stpcpy)

	andcc		%o1, 3, %g0

	be		20f

	 sethi		%hi(0x80808080), %o4

	ldub		[%o1], %o5

	stb		%o5, [%o0]

	cmp		%o5, 0

	add		%o0, 1, %o0

	be		1f

	 add		%o1, 1, %o1

	andcc		%o1, 3, %g0

	be		4f

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

	ldub		[%o1], %o5

	stb		%o5, [%o0]

	cmp		%o5, 0

	add		%o0, 1, %o0

	be		1f

	 add		%o1, 1, %o1

	andcc		%o1, 3, %g0

	be		5f

	 sethi		%hi(0x01010101), %o4

	ldub		[%o1], %o5

	stb		%o5, [%o0]

	cmp		%o5, 0

	add		%o0, 1, %o0

	be		1f

	 add		%o1, 1, %o1

	b		6f

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

1:	retl

	 add		%o0, -1, %o0

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

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

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

6:	andcc		%o0, 3, %g0

	bne		16f

	 sub		%g0, 4, %g1

11:	add		%g1, 4, %g1

	ld		[%o1 + %g1], %o5

	sub		%o5, %o2, %o4

#ifdef EIGHTBIT_NOT_RARE

	andn		%o4, %o5, %o4

#endif

	andcc		%o4, %o3, %g0

	be,a		11b

	 st		%o5, [%o0 + %g1]

	/* Check every byte. */

	srl		%o5, 24, %g5

	andcc		%g5, 0xff, %g0

	be		14f

	 srl		%o5, 16, %g5

	andcc		%g5, 0xff, %g0

	be		13f

	 srl		%o5, 8, %g5

	andcc		%g5, 0xff, %g0

	be		12f

	 andcc		%o5, 0xff, %g0

	bne		11b

	 st		%o5, [%o0 + %g1]

	add		%o0, %g1, %o0

	retl

	 add		%o0, 3, %o0

12:	srl		%o5, 16, %o5

	sth		%o5, [%o0 + %g1]

	add		%g1, 2, %g1

	stb		%g0, [%o0 + %g1]

	retl

	 add		%o0, %g1, %o0

13:	srl		%o5, 16, %o5

	sth		%o5, [%o0 + %g1]

	add		%g1, 1, %g1

	retl

	 add		%o0, %g1, %o0

14:	stb		%g0, [%o0 + %g1]

	retl

	 add		%o0, %g1, %o0

15:	srl		%o5, 24, %o4

	srl		%o5, 16, %g1

	stb		%o4, [%o0]

	srl		%o5, 8, %g4

	stb		%g1, [%o0 + 1]

	stb		%g4, [%o0 + 2]

	stb		%o5, [%o0 + 3]

	add		%o0, 4, %o0

16:	ld		[%o1], %o5

	sub		%o5, %o2, %o4

	andcc		%o4, %o3, %g0

	be		15b

	 add		%o1, 4, %o1

	/* Check every byte. */

	srl		%o5, 24, %g5

	andcc		%g5, 0xff, %g4

	be		19f

	 stb		%g4, [%o0]

	srl		%o5, 16, %g5

	andcc		%g5, 0xff, %g4

	be		18f

	 stb		%g4, [%o0 + 1]

	srl		%o5, 8, %g5

	andcc		%g5, 0xff, %g4

	be		17f

 	 stb		%g4, [%o0 + 2]

	andcc		%o5, 0xff, %g4

	stb		%g4, [%o0 + 3]

	bne		16b

	 add		%o0, 4, %o0

	retl

	 sub		%o0, 1, %o0

17:	retl

	 add		%o0, 2, %o0

18:	retl

	 add		%o0, 1, %o0

19:	retl

	 nop

END(__stpcpy)

weak_alias (__stpcpy, stpcpy)

libc_hidden_def (__stpcpy)

libc_hidden_builtin_def (stpcpy)