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
|
/************************************************************************
************************************************************************
FAUST compiler
Copyright (C) 2003-2014 GRAME, Centre National de Creation Musicale
---------------------------------------------------------------------
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
************************************************************************
************************************************************************/
// Author: Nick Strupat
// Date: October 29, 2010
// Returns the cache line size (in bytes) of the processor, or 0 on failure
#if defined(__APPLE__)
#include <sys/sysctl.h>
size_t cache_line_size()
{
size_t line_size = 0;
size_t sizeof_line_size = sizeof(line_size);
sysctlbyname("hw.cachelinesize", &line_size, &sizeof_line_size, 0, 0);
return line_size;
}
#elif defined(__MINGW32__)
// MinGW doesn't have GetLogicalProcessorInformation() and friends in its
// libraries.
#include <stdlib.h>
size_t cache_line_size()
{
return 0;
}
#elif defined(WIN32)
#include <stdlib.h>
#include <windows.h>
size_t cache_line_size()
{
size_t line_size = 0;
DWORD buffer_size = 0;
DWORD i = 0;
SYSTEM_LOGICAL_PROCESSOR_INFORMATION* buffer = 0;
GetLogicalProcessorInformation(0, &buffer_size);
buffer = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION*)malloc(buffer_size);
GetLogicalProcessorInformation(&buffer[0], &buffer_size);
for (i = 0; i != buffer_size / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION); ++i) {
if (buffer[i].Relationship == RelationCache && buffer[i].Cache.Level == 1) {
line_size = buffer[i].Cache.LineSize;
break;
}
}
free(buffer);
return line_size;
}
#elif defined(linux)
#include <stdio.h>
size_t cache_line_size()
{
FILE* p = 0;
p = fopen("/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size", "r");
unsigned int i = 0;
if (p) {
fscanf(p, "%d", &i);
fclose(p);
}
return i;
}
#else
#warning Unrecognized platform
#include <cstddef>
size_t cache_line_size()
{
return 0;
}
#endif
|
