1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* Vector optimized 32/64 bit S/390 version of strchr.
Copyright (C) 2015-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* char *strchr (const char *s, int c)
Locate character in string.
Register usage:
-r1=tmp
-r2=s
-r3=c
-r4=tmp
-r5=current_len
-v16=part of s
-v17=index of unequal
-v18=replicated c
*/
ENTRY(__strchr_vx)
.machine "z13"
.machinemode "zarch_nohighgprs"
vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */
lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */
lghi %r5,0 /* current_len = 0. */
vlvgb %v18,%r3,0 /* Generate vector which elements are all c.
If c > 255, c will be truncated. */
vrepb %v18,%v18,0
vfeezbs %v16,%v16,%v18 /* Find element equal with zero search. */
vlgvb %r4,%v16,7 /* Load byte index of character or zero. */
clrjl %r4,%r1,.Lfound /* Return if c/zero is in loaded bytes. */
/* Align s to 16 byte. */
risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
lghi %r5,16 /* current_len = 16. */
slr %r5,%r4 /* Compute bytes to 16bytes boundary. */
/* Find c/zero in 16 byte aligned loop */
.Lloop:
vl %v16,0(%r5,%r2) /* Load s. */
vfeezbs %v16,%v16,%v18 /* Find element equal with zero search. */
jno .Lfound /* Found c/zero (cc=0|1|2). */
vl %v16,16(%r5,%r2)
vfeezbs %v16,%v16,%v18
jno .Lfound16
vl %v16,32(%r5,%r2)
vfeezbs %v16,%v16,%v18
jno .Lfound32
vl %v16,48(%r5,%r2)
vfeezbs %v16,%v16,%v18
jno .Lfound48
aghi %r5,64
j .Lloop /* No character and no zero -> loop. */
.Lfound48:
la %r5,16(%r5) /* Use la since aghi would clobber cc. */
.Lfound32:
la %r5,16(%r5)
.Lfound16:
la %r5,16(%r5)
.Lfound:
je .Lzero /* Found zero, but no c before that zero. */
.Lcharacter:
vlgvb %r4,%v16,7 /* Load byte index of character. */
algr %r5,%r4
la %r2,0(%r5,%r2) /* Return pointer to character. */
br %r14
.Lzero:
llgcr %r3,%r3 /* char c_char = (char) c. */
clije %r3,0,.Lcharacter /* Found zero and c is zero. */
lghi %r2,0 /* Return null if character not found. */
br %r14
END(__strchr_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
|
