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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/* Vector optimized 32/64 bit S/390 version of memccpy.
Copyright (C) 2015-2019 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/>. */
#include <ifunc-memccpy.h>
#if HAVE_MEMCCPY_Z13
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* void *memccpy (void * dest, const void *src, int c, size_t n)
Copies no more than n bytes from src to dest,
stopping when the character c is found
and returns pointer next to c in dest or null if c not found.
Register usage:
-r0=tmp
-r1=tmp
-r2=dest
-r3=src
-r4=c
-r5=n
-r6=current_len
-v16=part of s
-v17=index of found c
-v18=c replicated
-v19=part #2 of s
-v31=save area for r6
*/
ENTRY(MEMCCPY_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r5,%r5
# endif /* !defined __s390x__ */
vlvgp %v31,%r6,%r7 /* Save registers. */
clgije %r5,0,.Lnf_end /* If len == 0 then exit. */
vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */
lcbb %r0,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */
llgfr %r0,%r0 /* Convert 32bit to 64bit. */
vlvgb %v18,%r4,0 /* Generate vector which elements are all c.
if c > 255, c will be truncated. */
vrepb %v18,%v18,0
lghi %r6,0 /* current_len = 0. */
clgrjle %r5,%r0,.Lremaining_v16 /* If maxlen <= loaded-bytes
-> Process remaining. */
vfeebs %v17,%v16,%v18 /* Find c. */
vlgvb %r1,%v17,7 /* Load byte index of c. */
clgrjl %r1,%r0,.Lfound_v16 /* Found c is within loaded bytes. */
/* Align s to 16 byte. */
risbgn %r1,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
lghi %r6,15 /* current_len = 15. */
slr %r6,%r1 /* Compute highest index to 16byte boundary. */
vstl %v16,%r6,0(%r2) /* Store prcessed bytes */
ahi %r6,1
.Lpreloop1:
/* Now we are 16byte aligned, so we can load
a full vreg without page fault. */
vl %v16,0(%r6,%r3) /* Load s. */
clgijl %r5,17,.Lremaining_v16 /* If n <= 16,
process remaining bytes. */
lgr %r7,%r5
slgfi %r7,16 /* border_len = n - 16. */
j .Lloop1
.Lloop2:
vl %v16,16(%r6,%r3)
vst %v19,0(%r6,%r2)
aghi %r6,16
.Lloop1:
clgrjhe %r6,%r7,.Lremaining_v16 /* If current_len >= border
then process remaining bytes. */
vfeebs %v17,%v16,%v18 /* Find c. */
jl .Lfound_v16 /* Jump away if c was found. */
vl %v19,16(%r6,%r3) /* Load next s part. */
vst %v16,0(%r6,%r2) /* Store previous part without c. */
aghi %r6,16
clgrjhe %r6,%r7,.Lremaining_v19
vfeebs %v17,%v19,%v18
jl .Lfound_v19
vl %v16,16(%r6,%r3)
vst %v19,0(%r6,%r2)
aghi %r6,16
clgrjhe %r6,%r7,.Lremaining_v16
vfeebs %v17,%v16,%v18
jl .Lfound_v16
vl %v19,16(%r6,%r3)
vst %v16,0(%r6,%r2)
aghi %r6,16
clgrjhe %r6,%r7,.Lremaining_v19
vfeebs %v17,%v19,%v18
jo .Lloop2
.Lfound_v19:
vlr %v16,%v19
.Lfound_v16:
/* v16 contains c. Store remaining bytes to c. currlen hasn´t
reached border, thus checking for maxlen is not needed! */
vlgvb %r1,%v17,7 /* Load byte index of c. */
la %r2,0(%r6,%r2) /* vstl has no support for index-register. */
.Lfound_v16_store:
vstl %v16,%r1,0(%r2) /* Copy bytes including c. */
la %r2,1(%r1,%r2) /* Return pointer next to c in dest. */
vlgvg %r6,%v31,0
vlgvg %r7,%v31,1
br %r14
.Lremaining_v19:
vlr %v16,%v19
.Lremaining_v16:
/* v16 contains the remaining bytes [1...16].
Check and store remaining bytes. */
vfeebs %v17,%v16,%v18
slgrk %r7,%r5,%r6 /* Remaining bytes = maxlen - current_len. */
aghi %r7,-1 /* vstl needs highest index. */
la %r2,0(%r6,%r2) /* vstl has no index register. */
vlgvb %r1,%v17,7 /* Load index of c or 16 if not found. */
/* c in remaining bytes? -> Jump away (c-index <= max-index) */
clrjle %r1,%r7,.Lfound_v16_store
vstl %v16,%r7,0(%r2) /* Store remaining bytes. */
.Lnf_end:
vlgvg %r6,%v31,0
vlgvg %r7,%v31,1
lghi %r2,0 /* Return null. */
br %r14
END(MEMCCPY_Z13)
# if ! HAVE_MEMCCPY_IFUNC
strong_alias (MEMCCPY_Z13, __memccpy)
weak_alias (__memccpy, memccpy)
# endif
#endif /* HAVE_MEMCCPY_Z13 */
|
GitWeb