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
142
|
/* Vector Optimized 32/64 bit S/390 version of wmemset.
Copyright (C) 2015-2016 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
/* wchar_t *wmemset(wchar_t *dest, wchar_t wc, size_t n)
Fill an array of wide-characters with a constant wide character
and returns dest.
Register usage:
-r0=tmp
-r1=tmp
-r2=dest or current-pointer
-r3=wc
-r4=n
-r5=tmp
-v16=replicated wc
-v17,v18,v19=copy of v16 for vstm
-v31=saved dest for return
*/
ENTRY(__wmemset_vx)
.machine "z13"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r4,%r4
# endif /* !defined __s390x__ */
vlvgg %v31,%r2,0 /* Save destination pointer for return. */
clgije %r4,0,.Lend
vlvgf %v16,%r3,0 /* Generate vector with wchar_t wc. */
vrepf %v16,%v16,0
/* Check range of maxlen and convert to byte-count. */
# ifdef __s390x__
tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */
lghi %r5,-4 /* Max byte-count is 18446744073709551612. */
# else
tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */
llilf %r5,4294967292 /* Max byte-count is 4294967292. */
# endif /* !__s390x__ */
sllg %r4,%r4,2 /* Convert character-count to byte-count. */
locgrne %r4,%r5 /* Use max byte-count, if bit 0/1 was one. */
/* Align dest to 16 byte. */
risbg %r0,%r2,60,128+63,0 /* Test if s is aligned and
%r3 = bits 60-63 'and' 15. */
je .Lpreloop /* If s is aligned, loop aligned. */
tmll %r2,3 /* Test if s is 4-byte aligned? */
jne .Lfallback /* And use common-code variant if not. */
lghi %r1,16
slr %r1,%r0 /* Compute byte count to load (16-x). */
clgr %r1,%r4
locgrh %r1,%r4 /* min (byte count, n) */
aghik %r5,%r1,-1 /* vstl needs highest index. */
vstl %v16,%r5,0(%r2) /* Store remaining bytes. */
clgrje %r1,%r4,.Lend /* Return if n bytes where set. */
slgr %r4,%r1 /* Compute remaining byte count. */
la %r2,0(%r1,%r2)
.Lpreloop:
/* Now we are 16-byte aligned. */
clgijl %r4,17,.Lremaining
srlg %r1,%r4,8 /* Split into 256byte blocks */
clgije %r1,0,.Lpreloop64
vlr %v17,%v16
vlr %v18,%v16
vlr %v19,%v16
.Lloop256:
vstm %v16,%v19,0(%r2)
vstm %v16,%v19,64(%r2)
vstm %v16,%v19,128(%r2)
vstm %v16,%v19,192(%r2)
la %r2,256(%r2)
brctg %r1,.Lloop256 /* Loop until all blocks are processed. */
llgfr %r4,%r4
nilf %r4,255 /* Get remaining bytes */
je .Lend /* Skip store remaining bytes if zero. */
.Lpreloop64:
clgijl %r4,17,.Lremaining
clgijl %r4,33,.Lpreloop16
srlg %r1,%r4,5 /* Split into 32byte blocks */
.Lloop32:
vst %v16,0(%r2)
vst %v16,16(%r2)
la %r2,32(%r2)
brctg %r1,.Lloop32 /* Loop until all blocks are processed. */
llgfr %r4,%r4
nilf %r4,31 /* Get remaining bytes */
je .Lend /* Skip store remaining bytes if zero. */
.Lpreloop16:
clgijl %r4,17,.Lremaining
srlg %r1,%r4,4 /* Split into 16byte blocks */
.Lloop16:
vst %v16,0(%r2)
la %r2,16(%r2)
brctg %r1,.Lloop16 /* Loop until all blocks are processed. */
llgfr %r4,%r4
nilf %r4,15 /* Get remaining bytes */
je .Lend /* Skip store remaining bytes if zero. */
.Lremaining:
aghi %r4,-1 /* vstl needs highest index. */
vstl %v16,%r4,0(%r2)
.Lend:
vlgvg %r2,%v31,0 /* Load saved dest for return value. */
br %r14
.Lfallback:
srlg %r4,%r4,2 /* Convert byte-count to character-count. */
jg __wmemset_c
END(__wmemset_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
|
