1 // Copyright 2015 The Gemmlowp Authors. All Rights Reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 // internal/platform.h: a place to put platform specific code
16
17 #ifndef GEMMLOWP_INTERNAL_PLATFORM_H_
18 #define GEMMLOWP_INTERNAL_PLATFORM_H_
19
20 #ifdef _WIN32
21 #include <windows.h>
22 #else
23 #include <stdlib.h>
24 #include <time.h>
25 #include <unistd.h>
26 #endif
27
28 #ifdef __APPLE__
29 #include <sys/time.h>
30 #endif
31
32 #if defined ANDROID || defined __ANDROID__
33 #include <malloc.h>
34 #include <android/api-level.h>
35 // The 18 here should be 16, but has to be 18 for now due
36 // to a Google-internal issue.
37 #if __ANDROID_API__ < 18
38 #define GEMMLOWP_USE_MEMALIGN
39 #endif
40 // posix_memalign is missing on some 4.1 x86 devices
41 #if __ANDROID_API__ == 18
42 #ifdef GEMMLOWP_X86_32
43 #define GEMMLOWP_USE_MEMALIGN
44 #endif
45 #endif
46 #endif
47
48 // Needed by chrome native builds
49 #ifndef _SC_NPROCESSORS_CONF
50 #define _SC_NPROCESSORS_CONF _SC_NPROCESSORS_ONLN
51 #endif
52
53 namespace gemmlowp {
54
55 #ifdef _WIN32
aligned_alloc(size_t alignment,size_t size)56 inline void *aligned_alloc(size_t alignment, size_t size) {
57 return _aligned_malloc(size, alignment);
58 }
59
aligned_free(void * memptr)60 inline void aligned_free(void *memptr) { _aligned_free(memptr); }
61
GetHardwareConcurrency(int max_threads)62 inline int GetHardwareConcurrency(int max_threads) {
63 if (max_threads == 0) {
64 SYSTEM_INFO sysinfo;
65 GetSystemInfo(&sysinfo);
66 return sysinfo.dwNumberOfProcessors;
67 }
68 return max_threads;
69 }
70
real_time_in_seconds()71 inline double real_time_in_seconds() {
72 __int64 wintime;
73 GetSystemTimeAsFileTime((FILETIME *)&wintime);
74 wintime -= 116444736000000000i64; // 1jan1601 to 1jan1970
75 return wintime / 10000000i64 + wintime % 10000000i64 * 100 * 1e-9;
76 }
77
78 #else
79 inline void *aligned_alloc(size_t alignment, size_t size) {
80 #ifdef GEMMLOWP_USE_MEMALIGN
81 return memalign(alignment, size);
82 #else
83 void *memptr;
84 if (posix_memalign(&memptr, alignment, size)) {
85 memptr = nullptr;
86 }
87 return memptr;
88 #endif
89 }
90
91 inline int GetHardwareConcurrency(int max_threads) {
92 if (max_threads == 0) {
93 static const int hardware_threads_count =
94 static_cast<int>(sysconf(_SC_NPROCESSORS_CONF));
95 return hardware_threads_count;
96 }
97 return max_threads;
98 }
99
100 inline void aligned_free(void *memptr) { free(memptr); }
101
102 inline double real_time_in_seconds() {
103 #ifdef __APPLE__
104 timeval t;
105 gettimeofday(&t, nullptr);
106 return t.tv_sec + 1e-6 * t.tv_usec;
107 #else
108 timespec t;
109 clock_gettime(CLOCK_REALTIME, &t);
110 return t.tv_sec + 1e-9 * t.tv_nsec;
111 #endif
112 }
113
114 #endif
115 } // namespace gemmlowp
116 #endif // GEMMLOWP_INTERNAL_PLATFORM_H_
117