1/* Vector optimized 32/64 bit S/390 version of wcschr.
2   Copyright (C) 2015-2021 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-wcschr.h>
20#if HAVE_WCSCHR_Z13
21
22# include "sysdep.h"
23# include "asm-syntax.h"
24
25	.text
26
27/* wchar_t *wcschr (const wchar_t *s, wchar_t c)
28   Locate character in string.
29
30   Register usage:
31   -r1=tmp
32   -r2=s
33   -r3=c
34   -r4=tmp
35   -r5=current_len
36   -v16=part of s
37   -v17=index of unequal
38   -v18=replicated c
39*/
40ENTRY(WCSCHR_Z13)
41	.machine "z13"
42	.machinemode "zarch_nohighgprs"
43
44	vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */
45	lcbb	%r1,0(%r2),6	/* Get bytes to 4k-byte boundary or 16.  */
46
47	tmll	%r2,3		/* Test if s is 4-byte aligned?   */
48	jne	.Lfallback	/* And use common-code variant if not.  */
49
50	lghi	%r5,0		/* current_len = 0.  */
51
52	vlvgf	%v18,%r3,0	/* Generate vector which elements are all c.  */
53	vrepf	%v18,%v18,0
54
55	vfeezfs	%v16,%v16,%v18	/* Find element equal with zero search.  */
56	vlgvb	%r4,%v16,7	/* Load byte index of character or zero.  */
57	clrjl	%r4,%r1,.Lfound /* Return if c/zero is in loaded bytes.  */
58
59	/* Align s to 16 byte.  */
60	risbgn	%r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
61	lghi	%r5,16		/* current_len = 16.  */
62	slr	%r5,%r4		/* Compute bytes to 16bytes boundary.  */
63
64	/* Find c/zero in 16byte aligned loop */
65.Lloop:
66	vl	%v16,0(%r5,%r2) /* Load s.  */
67	vfeezfs	%v16,%v16,%v18	/* Find element equal with zero search.  */
68	jno	.Lfound		/* Found c/zero (cc=0|1|2).  */
69	vl	%v16,16(%r5,%r2)
70	vfeezfs	%v16,%v16,%v18
71	jno	.Lfound16
72	vl	%v16,32(%r5,%r2)
73	vfeezfs	%v16,%v16,%v18
74	jno	.Lfound32
75	vl	%v16,48(%r5,%r2)
76	vfeezfs	%v16,%v16,%v18
77	jno	.Lfound48
78
79	aghi	%r5,64
80	j	.Lloop		/* No character and no zero -> loop.  */
81
82.Lfound48:
83	la	%r5,16(%r5)	/* Use la since aghi would clobber cc.  */
84.Lfound32:
85	la	%r5,16(%r5)
86.Lfound16:
87	la	%r5,16(%r5)
88.Lfound:
89	je	.Lzero		/* Found zero, but no c before that zero.  */
90
91.Lcharacter:
92	vlgvb	%r4,%v16,7	/* Load byte index of character.  */
93	algr	%r5,%r4
94	la	%r2,0(%r5,%r2)	/* Return pointer to character.  */
95	br	%r14
96
97.Lzero:
98	clije	%r3,0,.Lcharacter /* Found zero and c is zero.  */
99	lghi	%r2,0		/* Return null if character not found.  */
100	br	%r14
101.Lfallback:
102	jg	WCSCHR_C
103END(WCSCHR_Z13)
104
105# if ! HAVE_WCSCHR_IFUNC
106strong_alias (WCSCHR_Z13, __wcschr)
107weak_alias (__wcschr, wcschr)
108# endif
109
110# if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT \
111	&& defined SHARED && IS_IN (libc)
112strong_alias (WCSCHR_Z13, __GI___wcschr)
113weak_alias (WCSCHR_Z13, __GI_wcschr)
114# endif
115#endif
116