1/* Vector optimized 32/64 bit S/390 version of strcpy.
2   Copyright (C) 2015-2022 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#include <ifunc-strcpy.h>
20#include "sysdep.h"
21#include "asm-syntax.h"
22
23	.text
24
25#if HAVE_STRCPY_Z13
26/* char * strcpy (const char *dest, const char *src)
27   Copy string src to dest.
28
29   Register usage:
30   -r1=tmp
31   -r2=dest and return_value
32   -r3=src
33   -r4=tmp
34   -r5=current_len
35   -v16=part of src
36   -v17=index of zero
37   -v18=part of src
38*/
39ENTRY(STRCPY_Z13)
40	.machine "z13"
41	.machinemode "zarch_nohighgprs"
42
43	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */
44	lcbb	%r1,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */
45
46	vfenezb	%v17,%v16,%v16	/* Find element not equal with zero search.  */
47	vlgvb	%r5,%v17,7	/* Load zero index or 16 if not found.  */
48	clrjl	%r5,%r1,.Lfound_align /* If found zero within loaded bytes,
49					 copy bytes before and return.  */
50
51	/* Align s to 16 byte.  */
52	risbgn	%r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
53	lghi	%r5,15		/* current_len = 15.  */
54	slr	%r5,%r4		/* Compute highest index to 16byte boundary.  */
55
56	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */
57	ahi	%r5,1		/* Start loop at next character.  */
58
59	/* Find zero in 16byte aligned loop.  */
60.Lloop:
61	vl	%v16,0(%r5,%r3)	/* Load s.  */
62	vfenezbs %v17,%v16,%v16	/* Find element not equal with zero search.  */
63	je	.Lfound_v16_0	/* Jump away if zero was found.  */
64	vl	%v18,16(%r5,%r3)/* Load next part of s.  */
65	vst	%v16,0(%r5,%r2)	/* Store previous part without zero to dst.  */
66	vfenezbs %v17,%v18,%v18
67	je	.Lfound_v18_16
68	vl	%v16,32(%r5,%r3)
69	vst	%v18,16(%r5,%r2)
70	vfenezbs %v17,%v16,%v16
71	je	.Lfound_v16_32
72	vl	%v18,48(%r5,%r3)
73	vst	%v16,32(%r5,%r2)
74	vfenezbs %v17,%v18,%v18
75	je	.Lfound_v18_48
76	vst	%v18,48(%r5,%r2)
77
78	aghi	%r5,64
79	j	.Lloop	/* No zero found -> loop.  */
80
81.Lfound_v16_32:
82	aghi	%r5,32
83.Lfound_v16_0:
84	la	%r3,0(%r5,%r2)
85	vlgvb	%r4,%v17,7	/* Load byte index of zero.  */
86	vstl	%v16,%r4,0(%r3)	/* Store characters including zero.  */
87	br	%r14
88
89.Lfound_v18_48:
90	aghi	%r5,32
91.Lfound_v18_16:
92	la	%r3,16(%r5,%r2)
93	vlgvb	%r4,%v17,7	/* Load byte index of zero.  */
94	vstl	%v18,%r4,0(%r3)	/* Store characters including zero.  */
95	br	%r14
96
97.Lfound_align:
98	vstl	%v16,%r5,0(%r2)	/* Copy characters including zero.  */
99	br	%r14
100END(STRCPY_Z13)
101
102# if ! HAVE_STRCPY_IFUNC
103strong_alias (STRCPY_Z13, strcpy)
104# endif
105
106# if ! HAVE_STRCPY_Z900_G5 && defined SHARED && IS_IN (libc)
107strong_alias (STRCPY_Z13, __GI_strcpy)
108# endif
109#endif
110