Added profiling functions

haversine_02/include/profiler/timer.h

@@ -0,0 +1,25 @@
+#ifndef TIMER_H
+#define TIMER_H
+
+#include "aliases.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+u64 get_os_frequency();
+
+// Time in nanoseconds
+u64 get_os_time(void);
+
+// CPU timer using rdtsc
+u64 read_cpu_timer(void);
+
+// CPU frequency in hz/sec
+u64 get_cpu_freq(u64 milliseconds);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !TIMER_H

haversine_02/src/profiler/timer.c

@@ -0,0 +1,46 @@
+#include "profiler/timer.h"
+#include "aliases.h"
+#include <time.h>
+
+#include <x86intrin.h>
+
+typedef struct timespec timespec_t;
+
+u64 get_os_frequency() { return 1000000000; }
+
+u64 get_os_time(void) {
+  timespec_t ts = {0};
+
+  if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts) != 0) {
+    return 0;
+  }
+
+  return ts.tv_sec * get_os_frequency() + ts.tv_nsec;
+}
+
+u64 read_cpu_timer(void) { return __rdtsc(); }
+
+u64 get_cpu_freq(u64 milliseconds) {
+  u64 os_freq = get_os_frequency();
+  u64 os_start = get_os_time();
+  u64 cpu_start = read_cpu_timer();
+  u64 os_end = 0;
+  u64 os_elapsed = 0;
+  u64 os_wait_time = os_freq * milliseconds / 1000;
+
+  while (os_elapsed < os_wait_time) {
+    os_end = get_os_time();
+    os_elapsed = os_end - os_start;
+  }
+
+  u64 cpu_end = read_cpu_timer();
+  u64 cpu_elapsed = cpu_end - cpu_start;
+
+  u64 cpu_freq = 0;
+
+  if (os_elapsed) {
+    cpu_freq = cpu_elapsed * os_freq / os_elapsed;
+  }
+
+  return cpu_freq;
+}