add stats comparison

src/rvprof_output.c

@@ -0,0 +1,15 @@
+#include "rvprof_internal.h"
+
+// comparison used to sort regions by exclusive time
+static int compare_functions(const void* fn_a, const void* fn_b){
+    const function_stats_t* stats_a = (const function_stats_t*)fn_a;
+    const function_stats_t* stats_b = (const function_stats_t*)fn_b;
+
+    if (stats_a->total_exclusive_time > stats_b->total_exclusive_time){
+        return -1;
+    } else if (stats_a->total_exclusive_time < stats_b->total_exclusive_time){
+        return 1;
+    } else{
+        return 0;
+    }
+}