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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* Vector optimized 32/64 bit S/390 version of wcscmp.
Copyright (C) 2015-2022 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
<https://www.gnu.org/licenses/>. */
#include <ifunc-wcscmp.h>
#if HAVE_WCSCMP_Z13
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* int wcscmp (const wchar_t *s1, const wchar_t *s2)
Compare two strings
Register usage:
-r1=loaded byte count s1
-r2=s1
-r3=s2
-r4=loaded byte coutn s2, tmp
-r5=current_len
-v16=part of s1
-v17=part of s2
-v18=index of unequal
*/
ENTRY(WCSCMP_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
lghi %r5,0 /* current_len = 0. */
.Lloop:
vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */
vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */
lcbb %r1,0(%r5,%r2),6 /* Get loaded byte count of s1. */
jo .Llt16_1 /* Jump away if vr is not fully loaded. */
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2 /* Jump away if vr is not fully loaded. */
/* Both vrs are fully loaded. */
aghi %r5,16
vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
j .Lloop
.Lcmp_one_char:
/* At least one of both strings is not 4-byte aligned
and there is no full character before next block-boundary.
Compare one character to get over the boundary and
proceed with normal loop! */
vlef %v16,0(%r5,%r2),0 /* Load one character. */
vlef %v17,0(%r5,%r3),0
lghi %r1,4 /* Loaded byte count is 4. */
j .Llt_cmp /* Proceed with comparision. */
.Llt16_1:
lcbb %r4,0(%r5,%r3),6 /* Get loaded byte count of s2. */
.Llt16_2:
clr %r1,%r4
locrh %r1,%r4 /* Get minimum of bytes loaded in s1/2. */
nill %r1,65532 /* Align bytes loaded to full characters. */
jz .Lcmp_one_char /* Jump away if no full char is available. */
.Llt_cmp:
algfr %r5,%r1 /* Add smallest loaded bytes to current_len. */
vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */
vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */
clrjl %r4,%r1,.Lfound /* Jump away if miscompare is within loaded
bytes. */
j .Lloop
.Lfound:
/* vfenezf found an unequal element or zero.
This instruction compares unsigned words, but wchar_t is signed.
Thus we have to compare the found element again. */
vlgvb %r4,%v18,7 /* Extract not equal byte-index, */
srl %r4,2 /* Convert it to character-index. */
vlgvf %r3,%v16,0(%r4) /* Load character-values. */
vlgvf %r4,%v17,0(%r4)
cr %r3,%r4
je .Lend_equal
lghi %r2,1
lghi %r1,-1
locgrl %r2,%r1
br %r14
.Lend_equal:
lghi %r2,0
br %r14
END(WCSCMP_Z13)
# if ! HAVE_WCSCMP_IFUNC
strong_alias (WCSCMP_Z13, __wcscmp)
weak_alias (__wcscmp, wcscmp)
# endif
# if ! HAVE_WCSCMP_C && defined SHARED && IS_IN (libc)
strong_alias (WCSCMP_Z13, __GI___wcscmp)
# endif
#endif
|
