add benchmark

benchmark.c

@@ -0,0 +1,41 @@
+#include "lib.c"
+
+#ifndef BENCHMARK_ROUNDS
+#define BENCHMARK_ROUNDS 1
+#endif
+
+uint32_t crc32_update(char *p, uint16_t len)
+{
+	uint16_t i;
+	uint32_t crc = 0;
+	while (len--) {
+		crc ^= *p++;
+		for (i = 0; i < 8; i++)
+			crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
+	}
+    return crc;
+}
+
+uint32_t array[8];
+
+
+MAIN() {
+    MARKER(start_trace);
+    uint32_t crc = 0;
+    uint32_t a = 0, b = 1;
+    
+    for (uint16_t i = 0; i < BENCHMARK_ROUNDS; i++) {
+        // Calculate the nth. Fibonacci Number
+        for (uint8_t x = 0; x < sizeof(array)/sizeof(*array); x++) {
+            array[x] = a;
+            a = a + b;
+            b = array[x];
+        }
+
+        crc ^= crc32_update((char *)array, sizeof(array));
+    }
+    MARKER(stop_trace);
+
+    POSIX_PRINTF("SUM: %x\n", crc);
+}
+