1 files changed, 112 insertions, 0 deletions
diff --git a/internal/platform.h b/internal/platform.h
new file mode 100755
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--- /dev/null
+++ b/internal/platform.h
@@ -0,0 +1,112 @@
+// Copyright 2015 The Gemmlowp Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// internal/platform.h: a place to put platform specific code
+
+#ifndef GEMMLOWP_INTERNAL_PLATFORM_H_
+#define GEMMLOWP_INTERNAL_PLATFORM_H_
+
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <unistd.h>
+#include <time.h>
+#include <stdlib.h>
+#endif
+#include <malloc.h>
+
+#if defined ANDROID || defined __ANDROID__
+#include <android/api-level.h>
+// The 18 here should be 16, but has to be 18 for now due
+// to a Google-internal issue.
+#if __ANDROID_API__ < 18
+#define GEMMLOWP_USE_MEMALIGN
+#endif
+// posix_memalign is missing on some 4.1 x86 devices
+#if __ANDROID_API__ == 18
+#ifdef GEMMLOWP_X86_32
+#define GEMMLOWP_USE_MEMALIGN
+#endif
+#endif
+#endif
+
+
+namespace gemmlowp {
+
+#ifdef _WIN32
+inline void *aligned_alloc(size_t alignment, size_t size) {
+  return _aligned_malloc(size, alignment);
+}
+
+inline void aligned_free(void *memptr) {
+  _aligned_free(memptr);
+}
+
+inline int GetHardwareConcurrency(int max_threads) {
+  if (max_threads == 0) {
+    SYSTEM_INFO sysinfo;
+    GetSystemInfo(&sysinfo);
+    return sysinfo.dwNumberOfProcessors;
+  }
+  return max_threads;
+}
+
+inline double real_time_in_seconds() {
+  __int64 wintime; GetSystemTimeAsFileTime((FILETIME*)&wintime);
+  wintime -= 116444736000000000i64;	            //1jan1601 to 1jan1970
+  return wintime / 10000000i64 + wintime % 10000000i64 * 100 * 1e-9;
+}
+
+#else
+inline void *aligned_alloc(size_t alignment, size_t size) {
+#ifdef GEMMLOWP_USE_MEMALIGN
+  return memalign(alignment, size);
+#else
+  void *memptr;
+  if (posix_memalign(&memptr, alignment, size)) {
+    memptr = nullptr;
+  }
+  return memptr;
+#endif
+}
+
+inline int GetHardwareConcurrency(int max_threads) {
+  if (max_threads == 0) {
+    static const int hardware_threads_count =
+        static_cast<int>(sysconf(_SC_NPROCESSORS_CONF));
+    return hardware_threads_count;
+  }
+  return max_threads;
+}
+
+inline void aligned_free(void *memptr) {
+  free(memptr);
+}
+
+inline double real_time_in_seconds() {
+#ifdef __APPLE__
+  timeval t;
+  gettimeofday(&t, nullptr);
+  return t.tv_sec + 1e-6 * t.tv_usec;
+#else
+  timespec t;
+  clock_gettime(CLOCK_REALTIME, &t);
+  return t.tv_sec + 1e-9 * t.tv_nsec;
+#endif
+}
+
+#endif
+} // namespace gemmlowp
+#endif  // GEMMLOWP_INTERNAL_PLATFORM_H_