1/* Vector optimized 32/64 bit S/390 version of rawmemchr.
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-rawmemchr.h>
20
21#if HAVE_RAWMEMCHR_Z13
22
23# include "sysdep.h"
24# include "asm-syntax.h"
25
26	.text
27
28/* void *rawmemchr (const void *s, int c)
29   Scans memory for character c
30   and returns pointer to first c.
31
32   Register usage:
33   -r1=tmp
34   -r2=s
35   -r3=c
36   -r4=tmp
37   -r5=current_len
38   -v16=part of s
39   -v17=index of unequal
40   -v18=c replicated
41*/
42ENTRY(RAWMEMCHR_Z13)
43	.machine "z13"
44	.machinemode "zarch_nohighgprs"
45
46	vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */
47	lcbb	%r1,0(%r2),6	/* Get bytes to 4k-byte boundary or 16.  */
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	vfeeb	%v17,%v16,%v18	/* Vector find element equal.  */
54	vlgvb	%r5,%v17,7	/* Load byte index of character or zero.  */
55	clrjl	%r5,%r1,.Lend_found /* If found c is in loaded bytes, end.  */
56
57	/* Align s to 16 byte.  */
58	risbgn	%r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
59	lghi	%r5,16
60	slr	%r5,%r1		/* Compute bytes to 16bytes boundary.  */
61
62	/* Find c in a 16byte aligned loop.  */
63.Lloop:
64	vl	%v16,0(%r5,%r2)	/* Load s.  */
65	vfeebs	%v17,%v16,%v18	/* Vector find element equal.  */
66	jno	.Lcharacter	/* Jump away if element found.  */
67	vl	%v16,16(%r5,%r2)
68	vfeebs	%v17,%v16,%v18
69	jno	.Lcharacter16
70	vl	%v16,32(%r5,%r2)
71	vfeebs	%v17,%v16,%v18
72	jno	.Lcharacter32
73	vl	%v16,48(%r5,%r2)
74	vfeebs	%v17,%v16,%v18
75	jno	.Lcharacter48
76
77	aghi	%r5,64
78	j	.Lloop		/* No character found -> loop.  */
79
80	/* Found character.  */
81.Lcharacter48:
82	aghi %r5,16
83.Lcharacter32:
84	aghi %r5,16
85.Lcharacter16:
86	aghi %r5,16
87.Lcharacter:
88	vlgvb	%r1,%v17,7	/* Load byte index of character.  */
89	algr	%r5,%r1
90.Lend_found:
91	la	%r2,0(%r5,%r2)	/* Return pointer to character.  */
92	br	%r14
93END(RAWMEMCHR_Z13)
94
95# if ! HAVE_RAWMEMCHR_IFUNC
96strong_alias (RAWMEMCHR_Z13, __rawmemchr)
97weak_alias (__rawmemchr, rawmemchr)
98# endif
99
100# if ! HAVE_RAWMEMCHR_C && defined SHARED && IS_IN (libc)
101strong_alias (RAWMEMCHR_Z13, __GI___rawmemchr)
102# endif
103
104#endif /* HAVE_RAWMEMCHR_Z13  */
105