1/* Vector optimized 32/64 bit S/390 version of wcschrnul.
2 Copyright (C) 2015-2024 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

source code of glibc/sysdeps/s390/wcschrnul-vx.S