feat: Add benchmarking for libx52util-bmp-test

libx52util/meson.build

@@ -34,3 +34,7 @@ libx52util_bmp_test = executable(
 test('libx52util-bmp-test', libx52util_bmp_test,
   protocol: 'tap',
   args: [util_char_map[1]])
+
+benchmark('libx52util-bmp-bench', libx52util_bmp_test,
+  protocol: 'tap',
+  args: [util_char_map[1]])

libx52util/x52_char_map_test.c

@@ -13,6 +13,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
+#include <time.h>
 #include <unistd.h>
 
 #include "libx52util.h"
@@ -61,6 +62,11 @@ static void encode_utf8(uint32_t cp, uint8_t *out)
     }
 }
 
+static double get_time_diff(struct timespec start, struct timespec end)
+{
+    return (end.tv_sec - start.tv_sec) + (end.tv_nsec - start.tv_nsec) / 1e9;
+}
+
 int main(int argc, char *argv[])
 {
     uint8_t input[8] = {0};
@@ -72,6 +78,8 @@ int main(int argc, char *argv[])
     uint8_t *expected_blob;
     bool smp_pages_ok;
 
+    struct timespec start, end;
+
     // Argument check
     if (argc != 2) {
         puts("Bail out! Invalid number of arguments");
@@ -97,6 +105,8 @@ int main(int argc, char *argv[])
     // Check the 256 BMP Pages, plus the supplementary pages
     puts("1..257");
 
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
     for (uint32_t page = 0; page < 256; page++) {
         bool page_ok = true;
 
@@ -141,6 +151,16 @@ int main(int argc, char *argv[])
                 page + 1, page);
     }
 
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    {
+        double time_spent = get_time_diff(start, end);
+        printf("# -- Benchmark results --\n");
+        printf("# Total time for 64K lookups: %.4f seconds\n", time_spent);
+        printf("# Throughput: %.2f Mchars/sec\n", (65536.0 / time_spent) / 1e6);
+
+        printf("# -----------------------\n");
+    }
+
     // Handle the supplementary pages
     smp_pages_ok = true;
     for (uint32_t smp = 0x1; smp <= 0x10; smp++) {