1/* Vector optimized 32/64 bit S/390 version of wcschrnul.
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-wcschrnul.h>
20#if HAVE_WCSCHRNUL_Z13
21
22# include "sysdep.h"
23# include "asm-syntax.h"
24
25	.text
26
27/* wchar_t* wcschrnul (const wchar_t *s, wchar_t c)
28   Returns pointer to first c or to \0 if c not found.
29
30   Register usage:
31   -r1=tmp
32   -r2=s and return pointer
33   -r3=c
34   -r4=tmp
35   -r5=current_len
36   -v16=part of s
37   -v18=vector with c replicated in every byte
38*/
39ENTRY(WCSCHRNUL_Z13)
40	.machine "z13"
41	.machinemode "zarch_nohighgprs"
42
43	vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */
44	lcbb	%r1,0(%r2),6	/* Get bytes to 4k-byte boundary or 16.  */
45
46	tmll	%r2,3		/* Test if s is 4-byte aligned?   */
47	jne	.Lfallback	/* And use common-code variant if not.  */
48
49	lghi	%r5,0		/* current_len = 0.  */
50
51	vlvgf	%v18,%r3,0	/* Generate vector which elements are all c.  */
52	vrepf	%v18,%v18,0
53
54	vfeezfs	%v16,%v16,%v18	/* Find element equal with zero search.  */
55	vlgvb	%r4,%v16,7	/* Load byte index of character or zero.  */
56	clrjl	%r4,%r1,.Lfound /* Return if c/zero is in loaded bytes.  */
57
58	/* Align s to 16 byte.  */
59	risbgn	%r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
60	lghi	%r5,16		/* current_len = 16.  */
61	slr	%r5,%r4		/* Compute bytes to 16bytes boundary.  */
62
63	/* Find c/zero in 16byte aligned loop */
64.Lloop:
65	vl	%v16,0(%r5,%r2) /* Load s.  */
66	vfeezfs	%v16,%v16,%v18	/* Find element equal with zero search.  */
67	jno	.Lfound		/* Found c/zero (cc=0|1|2).  */
68	vl	%v16,16(%r5,%r2)
69	vfeezfs	%v16,%v16,%v18
70	jno	.Lfound16
71	vl	%v16,32(%r5,%r2)
72	vfeezfs	%v16,%v16,%v18
73	jno	.Lfound32
74	vl	%v16,48(%r5,%r2)
75	vfeezfs	%v16,%v16,%v18
76	jno	.Lfound48
77
78	aghi	%r5,64
79	j	.Lloop		/* No character and no zero -> loop.  */
80
81	/* Found character or zero */
82.Lfound48:
83	aghi	%r5,16
84.Lfound32:
85	aghi	%r5,16
86.Lfound16:
87	aghi	%r5,16
88.Lfound:
89	vlgvb	%r1,%v16,7	/* Load byte index of character.  */
90	algr	%r5,%r1
91	la	%r2,0(%r5,%r2)	/* Return pointer to character.  */
92
93.Lend:
94	br	%r14
95.Lfallback:
96	jg	WCSCHRNUL_C
97END(WCSCHRNUL_Z13)
98
99# if ! HAVE_WCSCHRNUL_IFUNC
100strong_alias (WCSCHRNUL_Z13, __wcschrnul)
101weak_alias (__wcschrnul, wcschrnul)
102# endif
103#endif
104