1 /* Vector optimized 32/64 bit S/390 version of wcschr.
2 Copyright (C) 2015-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #include <ifunc-wcschr.h>
23 # include "asm-syntax.h"
27 /* wchar_t *wcschr (const wchar_t *s, wchar_t c)
28 Locate character in string.
42 .machinemode "zarch_nohighgprs"
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. */
47 tmll %r2,3 /* Test if s is 4-byte aligned? */
48 jne .Lfallback /* And use common-code variant if not. */
50 lghi %r5,0 /* current_len = 0. */
52 vlvgf %v18,%r3,0 /* Generate vector which elements are all c. */
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. */
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. */
64 /* Find c/zero in 16byte aligned loop */
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). */
70 vfeezfs %v16,%v16,%v18
73 vfeezfs %v16,%v16,%v18
76 vfeezfs %v16,%v16,%v18
80 j .Lloop /* No character and no zero -> loop. */
83 la %r5,16(%r5) /* Use la since aghi would clobber cc. */
89 je .Lzero /* Found zero, but no c before that zero. */
92 vlgvb %r4,%v16,7 /* Load byte index of character. */
94 la %r2,0(%r5,%r2) /* Return pointer to character. */
98 clije %r3,0,.Lcharacter /* Found zero and c is zero. */
99 lghi %r2,0 /* Return null if character not found. */
105 # if ! HAVE_WCSCHR_IFUNC
106 strong_alias (WCSCHR_Z13, __wcschr)
107 weak_alias (__wcschr, wcschr)
110 # if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT \
111 && defined SHARED && IS_IN (libc)
112 strong_alias (WCSCHR_Z13, __GI___wcschr)
113 weak_alias (WCSCHR_Z13, __GI_wcschr)