Use sample_start and sample_end pairs instead of the PROFILER_SAMPLE

macro

haversine_02/src/profiler/timer.c

@@ -8,11 +8,6 @@
 
 #define MAX_PROFILE_SAMPLES 1024
 
-typedef struct {
-  const char *title;
-  u64 duration;
-} profiler_sample_t;
-
 typedef struct {
   profiler_sample_t samples[MAX_PROFILE_SAMPLES];
   u64 cpu_freq;
@@ -101,26 +96,35 @@ void profile_end() {
   for (u64 i = 0; i < profiler.size; ++i) {
     sample = &(profiler.samples[i]);
 
+    u64 duration = sample->end - sample->start;
+
     printf("%*s: %*lld (%*.*f %%)\n", (i32)profiler.max_title_length,
-           sample->title, duration_char_count,
-           (unsigned long long)sample->duration, percentage_char_count,
-           percentage_precision, (f64)sample->duration / total * 100.0);
+           sample->title, duration_char_count, (unsigned long long)duration,
+           percentage_char_count, percentage_precision,
+           (f64)duration / total * 100.0);
   }
 }
 
-void add_sample(const char *title, u64 duration) {
+profiler_sample_t sample_start(const char *title) {
+  return (profiler_sample_t){
+      .title = title,
+      .start = read_cpu_timer(),
+      .end = 0,
+  };
+}
+
+void sample_end(profiler_sample_t *sample) {
   if (profiler.size == MAX_PROFILE_SAMPLES) {
     return;
   }
 
-  u64 length = strlen(title);
+  u64 length = strlen(sample->title);
 
   if (length > profiler.max_title_length) {
     profiler.max_title_length = length;
   }
 
-  profiler.samples[(profiler.size)++] = (profiler_sample_t){
-      .title = title,
-      .duration = duration,
-  };
+  sample->end = read_cpu_timer();
+
+  profiler.samples[(profiler.size)++] = *sample;
 }