1/* Vector optimized 32/64 bit S/390 version of strchrnul.
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-strchrnul.h>
20
21#if HAVE_STRCHRNUL_Z13
22
23# include "sysdep.h"
24# include "asm-syntax.h"
25
26	.text
27
28/* char *strchrnul (const char *s, int c)
29   Returns pointer to first c or to \0 if c not found.
30
31   Register usage:
32   -r1=tmp
33   -r2=s and return pointer
34   -r3=c
35   -r4=tmp
36   -r5=current_len
37   -v16=part of s
38   -v18=vector with c replicated in every byte
39*/
40ENTRY(STRCHRNUL_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	lghi	%r5,0		/* current_len = 0.  */
48
49	vlvgb	%v18,%r3,0	/* Generate vector which elements are all c.
50				   If c > 255, c will be truncated.  */
51	vrepb	%v18,%v18,0
52
53	vfeezbs	%v16,%v16,%v18	/* Find element equal with zero search.  */
54	vlgvb	%r4,%v16,7	/* Load byte index of character or zero.  */
55	clrjl	%r4,%r1,.Lfound /* Return if c/zero is in loaded bytes.  */
56
57	/* Align s to 16 byte.  */
58	risbgn	%r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
59	lghi	%r5,16		/* current_len = 16.  */
60	slr	%r5,%r4		/* Compute bytes to 16bytes boundary.  */
61
62	/* Find c/zero in 16byte aligned loop */
63.Lloop:
64	vl	%v16,0(%r5,%r2) /* Load s */
65	vfeezbs	%v16,%v16,%v18	/* Find element equal with zero search.  */
66	jno	.Lfound		/* Found c/zero (cc=0|1|2).  */
67	vl	%v16,16(%r5,%r2)
68	vfeezbs	%v16,%v16,%v18
69	jno	.Lfound16
70	vl	%v16,32(%r5,%r2)
71	vfeezbs	%v16,%v16,%v18
72	jno	.Lfound32
73	vl	%v16,48(%r5,%r2)
74	vfeezbs	%v16,%v16,%v18
75	jno	.Lfound48
76
77	aghi	%r5,64
78	j	.Lloop		/* No character and no zero -> loop.  */
79
80	/* Found character or zero */
81.Lfound48:
82	aghi	%r5,16
83.Lfound32:
84	aghi	%r5,16
85.Lfound16:
86	aghi	%r5,16
87.Lfound:
88	vlgvb	%r1,%v16,7	/* Load byte index of character.  */
89	algr	%r5,%r1
90	la	%r2,0(%r5,%r2)	/* Return pointer to character.  */
91
92.Lend:
93	br	%r14
94END(STRCHRNUL_Z13)
95
96# if ! HAVE_STRCHRNUL_IFUNC
97strong_alias (STRCHRNUL_Z13, __strchrnul)
98weak_alias (__strchrnul, strchrnul)
99# endif
100
101#endif /* HAVE_STRCHRNUL_Z13  */
102