Embed ryg_rans (from https://github.com/rygorous/ryg_rans).

[narabu] / ryg_rans / platform.h

diff --git a/ryg_rans/platform.h b/ryg_rans/platform.h
new file mode 100644 (file)
index 0000000..5860fc3
--- /dev/null
+++ b/ryg_rans/platform.h
@@ -0,0 +1,64 @@
+// Just some platform utilities.
+#ifndef PLATFORM_H_INCLUDED
+#define PLATFORM_H_INCLUDED
+
+// x86 intrinsics (__rdtsc etc.)
+
+#if defined(_MSC_VER)
+
+#define _CRT_SECURE_NO_DEPRECATE
+#include <intrin.h>
+#define ALIGNSPEC(type,name,alignment) __declspec(align(alignment)) type name
+
+#elif defined(__GNUC__)
+
+#include <x86intrin.h>
+#define ALIGNSPEC(type,name,alignment) type name __attribute__((aligned(alignment)))
+
+#else
+#error Unknown compiler!
+#endif
+
+// Timer
+
+#if defined(_WIN32)
+
+#define WIN32_LEAN_AND_MEAN
+#define NOMINMAX
+#include <Windows.h>
+
+#define PRIu64 "llu"
+
+double timer()
+{
+    LARGE_INTEGER ctr, freq;
+    QueryPerformanceCounter(&ctr);
+    QueryPerformanceFrequency(&freq);
+    return 1.0 * ctr.QuadPart / freq.QuadPart;
+}
+
+#elif defined(__linux__)
+
+#define __STDC_FORMAT_MACROS
+#include <time.h>
+#include <inttypes.h>
+#include <assert.h>
+
+static inline double timer()
+{
+    timespec ts;
+    ts.tv_sec = 0;
+    ts.tv_nsec = 0;
+    int status = clock_gettime(CLOCK_MONOTONIC, &ts);
+    assert(status == 0);
+    return double(ts.tv_sec) + 1.0e-9 * double(ts.tv_nsec);
+}
+
+#else
+
+#error Unknown platform!
+
+#endif
+
+#endif // PLATFORM_H_INCLUDED
+