Flush instruction cache before starting the benchmark

src/main.c

@@ -103,6 +103,10 @@ static void command_bch(char *arg) {
 	__set_BASEPRI(1 << (8 - __NVIC_PRIO_BITS));
 
 	gene_init();
+
+	// flush instruction cache prior to executing the benchmark to
+	// ensure a "clean" system state
+	XMC_PREFETCH_InvalidateInstructionBuffer();
 	timer_start();
 
 	gene_main(val);