1 /* Vector optimized 32/64 bit S/390 version of strchrnul.
2 Copyright (C) 2015-2017 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 <http://www.gnu.org/licenses/>. */
19 #if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
22 # include "asm-syntax.h"
26 /* char *strchrnul (const char *s, int c)
27 Returns pointer to first c or to \0 if c not found.
31 -r2=s and return pointer
36 -v18=vector with c replicated in every byte
40 .machinemode "zarch_nohighgprs"
42 vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */
43 lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */
45 lghi %r5,0 /* current_len = 0. */
47 vlvgb %v18,%r3,0 /* Generate vector which elements are all c.
48 If c > 255, c will be truncated. */
51 vfeezbs %v16,%v16,%v18 /* Find element equal with zero search. */
52 vlgvb %r4,%v16,7 /* Load byte index of character or zero. */
53 clrjl %r4,%r1,.Lfound /* Return if c/zero is in loaded bytes. */
55 /* Align s to 16 byte. */
56 risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
57 lghi %r5,16 /* current_len = 16. */
58 slr %r5,%r4 /* Compute bytes to 16bytes boundary. */
60 /* Find c/zero in 16byte aligned loop */
62 vl %v16,0(%r5,%r2) /* Load s */
63 vfeezbs %v16,%v16,%v18 /* Find element equal with zero search. */
64 jno .Lfound /* Found c/zero (cc=0|1|2). */
66 vfeezbs %v16,%v16,%v18
69 vfeezbs %v16,%v16,%v18
72 vfeezbs %v16,%v16,%v18
76 j .Lloop /* No character and no zero -> loop. */
78 /* Found character or zero */
86 vlgvb %r1,%v16,7 /* Load byte index of character. */
88 la %r2,0(%r5,%r2) /* Return pointer to character. */
93 #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */