Optimize calculation of max_t and max_tau

Previously, 'max_t' and 'max_tau' were computed before verifying if the measurement was sufficient. This change moves their calculation to a later stage, reducing unnecessary computations when the measurement is insufficient. Change-Id: Ifa3afbe308e5a1c40c87ec1b4d9b3362c4c20f04

Author: BennyWang1007

dudect/fixture.c

@@ -139,9 +139,7 @@ static t_context_t *max_test()
 static bool report(void)
 {
  t_context_t *t = max_test();
- double max_t = fabs(t_compute(t));
  double number_traces_max_t = t->n[0] + t->n[1];
- double max_tau = max_t / sqrt(number_traces_max_t);
 
  printf("\033[A\033[2K");
  printf("measure: %7.2lf M, ", (number_traces_max_t / 1e6));
@@ -151,6 +149,9 @@ static bool report(void)
  return false;
  }
 
+ double max_t = fabs(t_compute(t));
+ double max_tau = max_t / sqrt(number_traces_max_t);
+
  /* max_t: the t statistic value
  * max_tau: a t value normalized by sqrt(number of measurements).
  * this way we can compare max_tau taken with different