Benchmark multiple cycles

5 files changed, 319 insertions, 193 deletions

diff --git a/source/kit_test/bench.c b/source/kit_test/bench.c
index b7de35f..1dc2736 100644
--- a/source/kit_test/bench.c
+++ b/source/kit_test/bench.c
@@ -10,35 +10,51 @@
 
 kit_benchs_list_t kit_benchs_list = { 0 };
 
+static void bench_set_repeats_limit(int i, int repeats_limit) {
+  if (kit_benchs_list.v[i].ready)
+    return;
+  if (kit_benchs_list.v[i].cycles_size >= KIT_BENCH_MAX_CYCLES)
+    return;
+  kit_benchs_list.v[i].cycles[kit_benchs_list.v[i].cycles_size] =
+      repeats_limit;
+  kit_benchs_list.v[i].cycles_size++;
+}
+
+static int bench_loop(int i) {
+  if (!kit_benchs_list.v[i].ready)
+    return 0;
+  return kit_benchs_list.v[i].repeats <
+         kit_benchs_list.v[i].cycles[kit_benchs_list.v[i].cycle];
+}
+
 static void bench_begin(int i) {
-  int const n = kit_benchs_list.benchs[i].repeats++;
+  int const n = kit_benchs_list.v[i].repeats++;
 
-  if (n >= KIT_BENCH_REPEATS)
+  if (n >= KIT_BENCH_MAX_REPEATS)
     return;
 
   struct timespec tv;
   timespec_get(&tv, TIME_UTC);
 
-  kit_benchs_list.benchs[i].sec[n]  = (int64_t) tv.tv_sec;
-  kit_benchs_list.benchs[i].nsec[n] = (int64_t) tv.tv_nsec;
+  kit_benchs_list.v[i].sec[n]  = (int64_t) tv.tv_sec;
+  kit_benchs_list.v[i].nsec[n] = (int64_t) tv.tv_nsec;
 }
 
 static void bench_end(int i) {
-  int const n = kit_benchs_list.benchs[i].repeats - 1;
+  int const n = kit_benchs_list.v[i].repeats - 1;
 
-  if (n < 0 || n >= KIT_BENCH_REPEATS)
+  if (n < 0 || n >= KIT_BENCH_MAX_REPEATS)
     return;
 
   struct timespec tv;
   timespec_get(&tv, TIME_UTC);
 
   int64_t const sec = ((int64_t) tv.tv_sec) -
-                      kit_benchs_list.benchs[i].sec[n];
+                      kit_benchs_list.v[i].sec[n];
   int64_t const nsec = ((int64_t) tv.tv_nsec) -
-                       kit_benchs_list.benchs[i].nsec[n];
+                       kit_benchs_list.v[i].nsec[n];
 
-  kit_benchs_list.benchs[i].duration_nsec[n] = sec * 1000000000 +
-                                               nsec;
+  kit_benchs_list.v[i].duration_nsec[n] = sec * 1000000000 + nsec;
 }
 
 enum { white, blue, light, yellow, red, green };
@@ -56,10 +72,13 @@ void kit_bench_register(char const *name, char const *file,
                         kit_bench_run_fn fn) {
   int n = kit_benchs_list.size++;
   if (n < KIT_BENCHS_SIZE_LIMIT) {
-    kit_benchs_list.benchs[n].bench_fn   = fn;
-    kit_benchs_list.benchs[n].bench_name = name;
-    kit_benchs_list.benchs[n].bench_file = file;
-    kit_benchs_list.benchs[n].repeats    = 0;
+    kit_benchmark_t *const bench = kit_benchs_list.v + n;
+
+    bench->bench_fn    = fn;
+    bench->bench_name  = name;
+    bench->bench_file  = file;
+    bench->cycles_size = 0;
+    bench->ready       = 0;
   }
 }
 
@@ -85,7 +104,8 @@ static void setup_signals() {
   int i;
 
   for (i = 0; i < sizeof signums / sizeof *signums; i++) {
-#if defined(_WIN32) && !(defined __CYGWIN__)
+#if (defined(_WIN32) && !defined(__CYGWIN__)) || \
+    !defined(_POSIX_C_SOURCE)
     signal(signums[i], handle_signal);
 #else
     struct sigaction action;
@@ -101,11 +121,12 @@ static int run_bench(volatile int i) {
   int signum = setjmp(kit_bench_restore_execution);
 
   if (signum != 0) {
-    kit_benchs_list.benchs[i].signal = signum;
+    kit_benchs_list.v[i].signal = signum;
     return 0;
   }
 
-  kit_benchs_list.benchs[i].bench_fn(i, bench_begin, bench_end);
+  kit_benchs_list.v[i].bench_fn(i, bench_set_repeats_limit,
+                                bench_loop, bench_begin, bench_end);
   return 1;
 }
 
@@ -115,6 +136,12 @@ int compare_64_(void const *x_, void const *y_) {
   return *x - *y;
 }
 
+int compare_32_(void const *x_, void const *y_) {
+  int const *x = (int const *) x_;
+  int const *y = (int const *) y_;
+  return *x - *y;
+}
+
 int kit_run_benchmarks(int argc, char **argv) {
   int success_count   = 0;
   int status          = 0;
@@ -122,13 +149,11 @@ int kit_run_benchmarks(int argc, char **argv) {
   int line_width      = 20;
   int carriage_return = 1;
 
-  int i, j;
-
   char const *specific_bench = NULL;
 
   setup_signals();
 
-  for (i = 0; i < argc; i++)
+  for (int i = 0; i < argc; i++)
     if (strcmp("--no-term-color", argv[i]) == 0)
       no_color = 1;
     else if (strcmp("--no-carriage-return", argv[i]) == 0)
@@ -149,41 +174,40 @@ int kit_run_benchmarks(int argc, char **argv) {
   ptrdiff_t   file_root    = -1;
   int         benchs_total = 0;
 
-  for (i = 0; i < kit_benchs_list.size && i < KIT_BENCHS_SIZE_LIMIT;
-       i++) {
+  for (int i = 0;
+       i < kit_benchs_list.size && i < KIT_BENCHS_SIZE_LIMIT; i++) {
     if (specific_bench != NULL &&
-        strstr(kit_benchs_list.benchs[i].bench_name,
-               specific_bench) == NULL)
+        strstr(kit_benchs_list.v[i].bench_name, specific_bench) ==
+            NULL)
       continue;
     benchs_total++;
-    int const l = 2 +
-                  (int) strlen(kit_benchs_list.benchs[i].bench_name);
+    int const l = 2 + (int) strlen(kit_benchs_list.v[i].bench_name);
     if (line_width < l)
       line_width = l;
   }
 
   if (benchs_total > 0) {
-    char const *const s = kit_benchs_list.benchs[0].bench_file;
+    char const *const s = kit_benchs_list.v[0].bench_file;
+
+    for (int j = 1;
+         j < kit_benchs_list.size && j < KIT_BENCHS_SIZE_LIMIT; j++) {
+      kit_benchmark_t *const bench = kit_benchs_list.v + j;
 
-    for (j = 1; j < kit_benchs_list.size && j < KIT_BENCHS_SIZE_LIMIT;
-         j++) {
       if (specific_bench != NULL &&
-          strstr(kit_benchs_list.benchs[j].bench_name,
-                 specific_bench) == NULL)
+          strstr(bench->bench_name, specific_bench) == NULL)
         continue;
-      if (strcmp(s, kit_benchs_list.benchs[j].bench_file) == 0)
+      if (strcmp(s, bench->bench_file) == 0)
         continue;
       int k = 0;
-      for (; s[k] != '\0' &&
-             kit_benchs_list.benchs[j].bench_file[k] != '\0' &&
-             s[k] == kit_benchs_list.benchs[j].bench_file[k];
+      for (; s[k] != '\0' && bench->bench_file[k] != '\0' &&
+             s[k] == bench->bench_file[k];
            k++) { }
       if (file_root == -1 || file_root > k)
         file_root = k;
     }
 
     if (file_root == -1) {
-      for (i = 0; s[i] != '\0'; i++)
+      for (int i = 0; s[i] != '\0'; i++)
         if (s[i] == '/' || s[i] == '\\')
           file_root = i + 1;
     }
@@ -207,91 +231,150 @@ int kit_run_benchmarks(int argc, char **argv) {
   no_color || print_color(light);
   printf(" in nanoseconds\n\n");
 
-  for (i = 0; i < kit_benchs_list.size && i < KIT_BENCHS_SIZE_LIMIT;
-       i++) {
+  /*  Prepare cycles.
+   */
+
+  for (int i = 0;
+       i < kit_benchs_list.size && i < KIT_BENCHS_SIZE_LIMIT; i++) {
+    kit_benchmark_t *const bench = kit_benchs_list.v + i;
+
     if (specific_bench != NULL &&
-        strstr(kit_benchs_list.benchs[i].bench_name,
-               specific_bench) == NULL)
+        strstr(bench->bench_name, specific_bench) == NULL)
       continue;
-    if (file == NULL ||
-        strcmp(file, kit_benchs_list.benchs[i].bench_file) != 0) {
-      if (file != NULL)
-        printf("\n");
-      file = kit_benchs_list.benchs[i].bench_file;
-      no_color || print_color(blue);
-      printf("* ");
-      no_color || print_color(white);
-      printf("%s\n", file + file_root);
+
+    run_bench(i);
+
+    if (bench->cycles_size == 0) {
+      bench->cycles_size = 2;
+      bench->cycles[0]   = KIT_BENCH_REPEATS_DEFAULT_1;
+      bench->cycles[1]   = KIT_BENCH_REPEATS_DEFAULT_2;
     }
 
-    !carriage_return || no_color || print_color(yellow);
-    carriage_return || no_color || print_color(light);
-    printf("` %s ", kit_benchs_list.benchs[i].bench_name);
-    !carriage_return || printf("\r");
-    fflush(stdout);
-
-    int bench_status = run_bench(i);
-
-    if (kit_benchs_list.benchs[i].repeats > KIT_BENCH_REPEATS)
-      bench_status = 0;
-
-    !carriage_return || no_color || print_color(light);
-    !carriage_return ||
-        printf("` %s ", kit_benchs_list.benchs[i].bench_name);
-
-    int const l = (int) strlen(kit_benchs_list.benchs[i].bench_name);
-    printf("%*c", line_width - l, ' ');
-
-    if (kit_benchs_list.benchs[i].repeats <= 0) {
-      no_color || print_color(yellow);
-      printf("                             0 runs\n");
-      success_count++;
-    } else if (bench_status == 0) {
-      no_color || print_color(red);
-      printf("                             FAIL\n");
-      status = 1;
-    } else {
-      int const repeats = kit_benchs_list.benchs[i].repeats;
-
-      qsort(kit_benchs_list.benchs[i].duration_nsec, repeats,
-            sizeof *kit_benchs_list.benchs[i].duration_nsec,
-            compare_64_);
-
-      int64_t const average =
-          kit_benchs_list.benchs[i].duration_nsec[repeats / 2];
-      int64_t const floor =
-          kit_benchs_list.benchs[i].duration_nsec[repeats / 20];
-      int64_t const roof =
-          kit_benchs_list.benchs[i]
-              .duration_nsec[repeats - repeats / 20 - 1];
-
-      no_color || print_color(white);
-      printf("%-8lld", (long long) floor);
-      no_color || print_color(light);
-      printf("| ");
-      no_color || print_color(white);
-      printf("%-8lld", (long long) average);
-      no_color || print_color(light);
-      printf("| ");
-      no_color || print_color(white);
-      printf("%-8lld", (long long) roof);
-      no_color || print_color(light);
-      printf(" %d runs\n", repeats);
-      success_count++;
+    qsort(bench->cycles, bench->cycles_size, sizeof *bench->cycles,
+          compare_32_);
+
+    kit_benchs_list.v[i].ready = 1;
+  }
+
+  /*  Run cycles.
+   */
+
+  for (int cycle = 0; cycle < KIT_BENCH_MAX_CYCLES; cycle++) {
+    /*  Prepare cycle.
+     */
+
+    int cycles_done = 1;
+
+    for (int i = 0;
+         i < kit_benchs_list.size && i < KIT_BENCHS_SIZE_LIMIT; i++) {
+      kit_benchmark_t *const bench = kit_benchs_list.v + i;
+
+      if (specific_bench != NULL &&
+          strstr(bench->bench_name, specific_bench) == NULL)
+        continue;
+      if (cycle >= bench->cycles_size)
+        continue;
+
+      bench->repeats = 0;
+      bench->cycle   = cycle;
+      cycles_done    = 0;
+    }
+
+    if (cycles_done)
+      break;
+
+    /*  Run benchmarks.
+     */
+
+    for (int i = 0;
+         i < kit_benchs_list.size && i < KIT_BENCHS_SIZE_LIMIT; i++) {
+      kit_benchmark_t *const bench = kit_benchs_list.v + i;
+
+      if (specific_bench != NULL &&
+          strstr(bench->bench_name, specific_bench) == NULL)
+        continue;
+      if (cycle >= bench->cycles_size)
+        continue;
+
+      if (file == NULL || strcmp(file, bench->bench_file) != 0) {
+        if (file != NULL)
+          printf("\n");
+        file = bench->bench_file;
+        no_color || print_color(blue);
+        printf("* ");
+        no_color || print_color(white);
+        printf("%s\n", file + file_root);
+      }
+
+      !carriage_return || no_color || print_color(yellow);
+      carriage_return || no_color || print_color(light);
+      printf("` %s ", bench->bench_name);
+      !carriage_return || printf("\r");
+      fflush(stdout);
+
+      int bench_status = run_bench(i);
+
+      if (bench->repeats > KIT_BENCH_MAX_REPEATS)
+        bench_status = 0;
+
+      !carriage_return || no_color || print_color(light);
+      !carriage_return || printf("` %s ", bench->bench_name);
+
+      int const l = (int) strlen(bench->bench_name);
+      printf("%*c", line_width - l, ' ');
+
+      if (bench->repeats <= 0) {
+        no_color || print_color(yellow);
+        printf("                             0 runs\n");
+        success_count++;
+      } else if (bench_status == 0) {
+        no_color || print_color(red);
+        printf("                             FAIL\n");
+        status = 1;
+      } else {
+        int const repeats = bench->repeats;
+
+        memcpy(bench->duration_sorted_nsec, bench->duration_nsec,
+               repeats * sizeof *bench->duration_sorted_nsec);
+        qsort(bench->duration_sorted_nsec, repeats,
+              sizeof *bench->duration_sorted_nsec, compare_64_);
+
+        int64_t const average =
+            bench->duration_sorted_nsec[repeats / 2];
+        int64_t const floor =
+            bench->duration_sorted_nsec[repeats / 20];
+        int64_t const roof =
+            bench->duration_sorted_nsec[repeats - repeats / 20 - 1];
+
+        no_color || print_color(white);
+        printf("%-8lld", (long long) floor);
+        no_color || print_color(light);
+        printf("| ");
+        no_color || print_color(white);
+        printf("%-8lld", (long long) average);
+        no_color || print_color(light);
+        printf("| ");
+        no_color || print_color(white);
+        printf("%-8lld", (long long) roof);
+        no_color || print_color(light);
+        printf(" %d runs\n", repeats);
+        success_count++;
+      }
     }
   }
 
   printf("\n");
 
   if (status != 0) {
-    for (i = 0; i < kit_benchs_list.size && i < KIT_BENCHS_SIZE_LIMIT;
-         i++) {
+    for (int i = 0;
+         i < kit_benchs_list.size && i < KIT_BENCHS_SIZE_LIMIT; i++) {
+      kit_benchmark_t *const bench = kit_benchs_list.v + i;
+
       if (specific_bench != NULL &&
-          strstr(kit_benchs_list.benchs[i].bench_name,
-                 specific_bench) == NULL)
+          strstr(bench->bench_name, specific_bench) == NULL)
         continue;
-      if (kit_benchs_list.benchs[i].signal != 0) {
-        int signum = kit_benchs_list.benchs[i].signal;
+      if (bench->signal != 0) {
+        int signum = bench->signal;
         if (signum >= 0 &&
             signum < sizeof signames / sizeof *signames &&
             signames[signum] != NULL) {
@@ -299,24 +382,22 @@ int kit_run_benchmarks(int argc, char **argv) {
           printf("Signal \"%s\" (%d) for \"", signames[signum],
                  signum);
           no_color || print_color(white);
-          printf("%s", kit_benchs_list.benchs[i].bench_name);
+          printf("%s", bench->bench_name);
           no_color || print_color(light);
           printf("\" in \"");
           no_color || print_color(white);
-          printf("%s",
-                 kit_benchs_list.benchs[i].bench_file + file_root);
+          printf("%s", bench->bench_file + file_root);
           no_color || print_color(light);
           printf("\"!.\n");
         } else {
           no_color || print_color(light);
           printf("Unknown signal (%d) for \"", signum);
           no_color || print_color(white);
-          printf("%s", kit_benchs_list.benchs[i].bench_name);
+          printf("%s", bench->bench_name);
           no_color || print_color(light);
           printf("\" in \"");
           no_color || print_color(white);
-          printf("%s",
-                 kit_benchs_list.benchs[i].bench_file + file_root);
+          printf("%s", bench->bench_file + file_root);
           no_color || print_color(light);
           printf("\"!.\n");
         }
diff --git a/source/kit_test/bench.h b/source/kit_test/bench.h
index 6c701bb..ba3e0f5 100644
--- a/source/kit_test/bench.h
+++ b/source/kit_test/bench.h
@@ -8,38 +8,62 @@ extern "C" {
 #include "test.h"
 #include <stdint.h>
 
-#ifndef KIT_BENCH_FILE
-#  define KIT_BENCH_FILE kit_bench
+#ifndef KIT_TEST_FILE
+#  define KIT_TEST_FILE kit_bench
 #endif
 
 #ifndef KIT_BENCHS_SIZE_LIMIT
 #  define KIT_BENCHS_SIZE_LIMIT 0x1000
 #endif
 
-#ifndef KIT_BENCH_REPEATS
-#  define KIT_BENCH_REPEATS 400
+#ifndef KIT_BENCH_MAX_REPEATS
+#  define KIT_BENCH_MAX_REPEATS 4000
 #endif
 
+#ifndef KIT_BENCH_MAX_CYCLES
+#  define KIT_BENCH_MAX_CYCLES 40
+#endif
+
+#ifndef KIT_BENCH_REPEATS_DEFAULT_1
+#  define KIT_BENCH_REPEATS_DEFAULT_1 40
+#endif
+
+#ifndef KIT_BENCH_REPEATS_DEFAULT_2
+#  define KIT_BENCH_REPEATS_DEFAULT_2 400
+#endif
+
+typedef void (*kit_bench_set_repeats_limit_fn)(int bench_index,
+                                               int repeats_limit);
+typedef int (*kit_bench_loop_fn)(int bench_index);
 typedef void (*kit_bench_begin_fn)(int bench_index);
 typedef void (*kit_bench_end_fn)(int bench_index);
+
 typedef void (*kit_bench_run_fn)(
-    int kit_bench_index_, kit_bench_begin_fn kit_bench_begin_fn_,
-    kit_bench_end_fn kit_bench_end_fn_);
+    int                            kit_bench_index_,
+    kit_bench_set_repeats_limit_fn kit_bench_set_repeats_limit_,
+    kit_bench_loop_fn              kit_bench_loop_,
+    kit_bench_begin_fn             kit_bench_begin_,
+    kit_bench_end_fn               kit_bench_end_);
 
 typedef struct {
   char const      *bench_name;
   char const      *bench_file;
   kit_bench_run_fn bench_fn;
-  int64_t          sec[KIT_BENCH_REPEATS];
-  int32_t          nsec[KIT_BENCH_REPEATS];
-  int64_t          duration_nsec[KIT_BENCH_REPEATS];
+  int64_t          sec[KIT_BENCH_MAX_REPEATS];
+  int32_t          nsec[KIT_BENCH_MAX_REPEATS];
+  int64_t          duration_nsec[KIT_BENCH_MAX_REPEATS];
+  int64_t          duration_sorted_nsec[KIT_BENCH_MAX_REPEATS];
   int              repeats;
+  int              cycles_size;
+  int              cycles[KIT_BENCH_MAX_CYCLES];
+  int              cycle;
   int              signal;
+  int              ready;
 } kit_benchmark_t;
 
 typedef struct {
   int             size;
-  kit_benchmark_t benchs[KIT_BENCHS_SIZE_LIMIT];
+  kit_benchmark_t v[KIT_BENCHS_SIZE_LIMIT];
 } kit_benchs_list_t;
 
 extern kit_benchs_list_t kit_benchs_list;
@@ -49,28 +73,34 @@ void kit_bench_register(char const *name, char const *file,
 
 #define KIT_BENCHMARK(name)                                          \
   static void KIT_TEST_CONCAT3_(kit_bench_run_, __LINE__,            \
-                                KIT_BENCH_FILE)(                     \
-      int, kit_bench_begin_fn, kit_bench_end_fn);                    \
+                                KIT_TEST_FILE)(                      \
+      int, kit_bench_set_repeats_limit_fn, kit_bench_loop_fn,        \
+      kit_bench_begin_fn, kit_bench_end_fn);                         \
   KIT_TEST_ON_START_(                                                \
-      KIT_TEST_CONCAT3_(kit_benchmark_, __LINE__, KIT_BENCH_FILE)) { \
-    kit_bench_register(name, __FILE__,                               \
-                       KIT_TEST_CONCAT3_(kit_bench_run_, __LINE__,   \
-                                         KIT_BENCH_FILE));           \
+      KIT_TEST_CONCAT3_(kit_benchmark_, __LINE__, KIT_TEST_FILE)) {  \
+    kit_bench_register(                                              \
+        name, __FILE__,                                              \
+        KIT_TEST_CONCAT3_(kit_bench_run_, __LINE__, KIT_TEST_FILE)); \
   }                                                                  \
   static void KIT_TEST_CONCAT3_(kit_bench_run_, __LINE__,            \
-                                KIT_BENCH_FILE)(                     \
-      int kit_bench_index_, kit_bench_begin_fn kit_bench_begin_fn_,  \
-      kit_bench_end_fn kit_bench_end_fn_)
-
-#define KIT_BENCHMARK_BEGIN                                          \
-  for (int kit_bench_repeat_ = 0;                                    \
-       kit_bench_repeat_ < KIT_BENCH_REPEATS; kit_bench_repeat_++) { \
-    kit_bench_begin_fn_(kit_bench_index_);                           \
+                                KIT_TEST_FILE)(                      \
+      int                            kit_bench_index_,               \
+      kit_bench_set_repeats_limit_fn kit_bench_set_repeats_limit_,   \
+      kit_bench_loop_fn              kit_bench_loop_,                \
+      kit_bench_begin_fn             kit_bench_begin_,               \
+      kit_bench_end_fn               kit_bench_end_)
+
+#define KIT_BENCHMARK_REPEAT(repeats_limit_) \
+  kit_bench_set_repeats_limit_(kit_bench_index_, repeats_limit_)
+
+#define KIT_BENCHMARK_BEGIN                   \
+  while (kit_bench_loop_(kit_bench_index_)) { \
+    kit_bench_begin_(kit_bench_index_);       \
     {
 
-#define KIT_BENCHMARK_END              \
-  }                                    \
-  kit_bench_end_fn_(kit_bench_index_); \
+#define KIT_BENCHMARK_END           \
+  }                                 \
+  kit_bench_end_(kit_bench_index_); \
   }
 
 /*  FIXME
@@ -85,6 +115,7 @@ int kit_run_benchmarks(int argc, char **argv);
 
 #ifndef KIT_DISABLE_SHORT_NAMES
 #  define BENCHMARK KIT_BENCHMARK
+#  define BENCHMARK_REPEAT KIT_BENCHMARK_REPEAT
 #  define BENCHMARK_BEGIN KIT_BENCHMARK_BEGIN
 #  define BENCHMARK_END KIT_BENCHMARK_END
 #  define DO_NOT_OPTIMIZE KIT_DO_NOT_OPTIMIZE
diff --git a/source/kit_test/test.c b/source/kit_test/test.c
index 3d3e180..6603d65 100644
--- a/source/kit_test/test.c
+++ b/source/kit_test/test.c
@@ -10,13 +10,13 @@
 kit_tests_list_t kit_tests_list = { 0 };
 
 static void report(int i, int line, int ok) {
-  int const n = kit_tests_list.tests[i].assertions++;
+  int const n = kit_tests_list.v[i].assertions++;
 
   if (n >= KIT_TEST_ASSERTIONS_LIMIT)
     return;
 
-  kit_tests_list.tests[i].line[n]   = line;
-  kit_tests_list.tests[i].status[n] = ok;
+  kit_tests_list.v[i].line[n]   = line;
+  kit_tests_list.v[i].status[n] = ok;
 }
 
 static long long ns_to_ms(long long ns) {
@@ -42,10 +42,10 @@ void kit_test_register(char const *name, char const *file,
                        kit_test_run_fn fn) {
   int n = kit_tests_list.size++;
   if (n < KIT_TESTS_SIZE_LIMIT) {
-    kit_tests_list.tests[n].test_fn    = fn;
-    kit_tests_list.tests[n].test_name  = name;
-    kit_tests_list.tests[n].test_file  = file;
-    kit_tests_list.tests[n].assertions = 0;
+    kit_tests_list.v[n].test_fn    = fn;
+    kit_tests_list.v[n].test_name  = name;
+    kit_tests_list.v[n].test_file  = file;
+    kit_tests_list.v[n].assertions = 0;
   }
 }
 
@@ -71,7 +71,8 @@ static void setup_signals() {
   int i;
 
   for (i = 0; i < sizeof signums / sizeof *signums; i++) {
-#if defined(_WIN32) && !(defined __CYGWIN__)
+#if (defined(_WIN32) && !defined(__CYGWIN__)) || \
+    !defined(_POSIX_C_SOURCE)
     signal(signums[i], handle_signal);
 #else
     struct sigaction action;
@@ -87,11 +88,11 @@ static int run_test(volatile int i) {
   int signum = setjmp(kit_test_restore_execution);
 
   if (signum != 0) {
-    kit_tests_list.tests[i].signal = signum;
+    kit_tests_list.v[i].signal = signum;
     return 0;
   }
 
-  kit_tests_list.tests[i].test_fn(i, report);
+  kit_tests_list.v[i].test_fn(i, report);
   return 1;
 }
 
@@ -139,30 +140,29 @@ int kit_run_tests(int argc, char **argv) {
   for (i = 0; i < kit_tests_list.size && i < KIT_TESTS_SIZE_LIMIT;
        i++) {
     if (specific_test != NULL &&
-        strstr(kit_tests_list.tests[i].test_name, specific_test) ==
-            NULL)
+        strstr(kit_tests_list.v[i].test_name, specific_test) == NULL)
       continue;
     tests_total++;
-    int const l = 2 + (int) strlen(kit_tests_list.tests[i].test_name);
+    int const l = 2 + (int) strlen(kit_tests_list.v[i].test_name);
     if (line_width < l)
       line_width = l;
   }
 
   if (tests_total > 0) {
-    char const *const s = kit_tests_list.tests[0].test_file;
+    char const *const s = kit_tests_list.v[0].test_file;
 
     for (j = 1; j < kit_tests_list.size && j < KIT_TESTS_SIZE_LIMIT;
          j++) {
       if (specific_test != NULL &&
-          strstr(kit_tests_list.tests[j].test_name, specific_test) ==
+          strstr(kit_tests_list.v[j].test_name, specific_test) ==
               NULL)
         continue;
-      if (strcmp(s, kit_tests_list.tests[j].test_file) == 0)
+      if (strcmp(s, kit_tests_list.v[j].test_file) == 0)
         continue;
       int k = 0;
-      for (; s[k] != '\0' &&
-             kit_tests_list.tests[j].test_file[k] != '\0' &&
-             s[k] == kit_tests_list.tests[j].test_file[k];
+      for (;
+           s[k] != '\0' && kit_tests_list.v[j].test_file[k] != '\0' &&
+           s[k] == kit_tests_list.v[j].test_file[k];
            k++) { }
       if (file_root == -1 || file_root > k)
         file_root = k;
@@ -178,14 +178,13 @@ int kit_run_tests(int argc, char **argv) {
   for (i = 0; i < kit_tests_list.size && i < KIT_TESTS_SIZE_LIMIT;
        i++) {
     if (specific_test != NULL &&
-        strstr(kit_tests_list.tests[i].test_name, specific_test) ==
-            NULL)
+        strstr(kit_tests_list.v[i].test_name, specific_test) == NULL)
       continue;
     if (file == NULL ||
-        strcmp(file, kit_tests_list.tests[i].test_file) != 0) {
+        strcmp(file, kit_tests_list.v[i].test_file) != 0) {
       if (file != NULL)
         quiet || printf("\n");
-      file = kit_tests_list.tests[i].test_file;
+      file = kit_tests_list.v[i].test_file;
       no_color || print_color(blue);
       quiet || printf("* ");
       no_color || print_color(white);
@@ -194,7 +193,7 @@ int kit_run_tests(int argc, char **argv) {
 
     !carriage_return || no_color || print_color(yellow);
     carriage_return || no_color || print_color(light);
-    quiet || printf("` %s ", kit_tests_list.tests[i].test_name);
+    quiet || printf("` %s ", kit_tests_list.v[i].test_name);
     !carriage_return || quiet || printf("\r");
     quiet || fflush(stdout);
 
@@ -207,23 +206,22 @@ int kit_run_tests(int argc, char **argv) {
     int duration = (int) (ns_to_ms(end.tv_nsec - begin.tv_nsec) +
                           sec_to_ms(end.tv_sec - begin.tv_sec));
 
-    for (j = 0; j < kit_tests_list.tests[i].assertions; j++)
-      if (kit_tests_list.tests[i].status[j] == 0) {
+    for (j = 0; j < kit_tests_list.v[i].assertions; j++)
+      if (kit_tests_list.v[i].status[j] == 0) {
         fail_assertion_count++;
         test_status = 0;
       }
 
-    if (kit_tests_list.tests[i].assertions >
-        KIT_TEST_ASSERTIONS_LIMIT)
+    if (kit_tests_list.v[i].assertions > KIT_TEST_ASSERTIONS_LIMIT)
       test_status = 0;
 
-    total_assertion_count += kit_tests_list.tests[i].assertions;
+    total_assertion_count += kit_tests_list.v[i].assertions;
 
     !carriage_return || no_color || print_color(light);
     !carriage_return || quiet ||
-        printf("` %s ", kit_tests_list.tests[i].test_name);
+        printf("` %s ", kit_tests_list.v[i].test_name);
 
-    int const l = (int) strlen(kit_tests_list.tests[i].test_name);
+    int const l = (int) strlen(kit_tests_list.v[i].test_name);
     quiet || printf("%*c", line_width - l, ' ');
 
     if (test_status == 0) {
@@ -256,11 +254,11 @@ int kit_run_tests(int argc, char **argv) {
     for (i = 0; i < kit_tests_list.size && i < KIT_TESTS_SIZE_LIMIT;
          i++) {
       if (specific_test != NULL &&
-          strstr(kit_tests_list.tests[i].test_name, specific_test) ==
+          strstr(kit_tests_list.v[i].test_name, specific_test) ==
               NULL)
         continue;
-      if (kit_tests_list.tests[i].signal != 0) {
-        int signum = kit_tests_list.tests[i].signal;
+      if (kit_tests_list.v[i].signal != 0) {
+        int signum = kit_tests_list.v[i].signal;
         if (signum >= 0 &&
             signum < sizeof signames / sizeof *signames &&
             signames[signum] != NULL) {
@@ -268,52 +266,52 @@ int kit_run_tests(int argc, char **argv) {
           quiet || printf("Signal \"%s\" (%d) for \"",
                           signames[signum], signum);
           no_color || print_color(white);
-          quiet || printf("%s", kit_tests_list.tests[i].test_name);
+          quiet || printf("%s", kit_tests_list.v[i].test_name);
           no_color || print_color(light);
           quiet || printf("\" in \"");
           no_color || print_color(white);
-          quiet || printf("%s", kit_tests_list.tests[i].test_file +
-                                    file_root);
+          quiet ||
+              printf("%s", kit_tests_list.v[i].test_file + file_root);
           no_color || print_color(light);
           quiet || printf("\"!.\n");
         } else {
           no_color || print_color(light);
           quiet || printf("Unknown signal (%d) for \"", signum);
           no_color || print_color(white);
-          quiet || printf("%s", kit_tests_list.tests[i].test_name);
+          quiet || printf("%s", kit_tests_list.v[i].test_name);
           no_color || print_color(light);
           quiet || printf("\" in \"");
           no_color || print_color(white);
-          quiet || printf("%s", kit_tests_list.tests[i].test_file +
-                                    file_root);
+          quiet ||
+              printf("%s", kit_tests_list.v[i].test_file + file_root);
           no_color || print_color(light);
           quiet || printf("\"!.\n");
         }
       }
-      if (kit_tests_list.tests[i].assertions >
+      if (kit_tests_list.v[i].assertions >
           KIT_TEST_ASSERTIONS_LIMIT) {
         no_color || print_color(light);
         quiet || printf("Too many assertions for \"");
         no_color || print_color(white);
-        quiet || printf("%s", kit_tests_list.tests[i].test_name);
+        quiet || printf("%s", kit_tests_list.v[i].test_name);
         no_color || print_color(light);
         quiet || printf("\" in \"");
         no_color || print_color(white);
-        quiet || printf("%s", kit_tests_list.tests[i].test_file +
-                                  file_root);
+        quiet ||
+            printf("%s", kit_tests_list.v[i].test_file + file_root);
         no_color || print_color(light);
         quiet || printf("\"!.\n");
       } else
-        for (j = 0; j < kit_tests_list.tests[i].assertions; j++)
-          if (!kit_tests_list.tests[i].status[j]) {
+        for (j = 0; j < kit_tests_list.v[i].assertions; j++)
+          if (!kit_tests_list.v[i].status[j]) {
             no_color || print_color(light);
             quiet || printf("Assertion on line ");
             no_color || print_color(white);
-            quiet || printf("%d", kit_tests_list.tests[i].line[j]);
+            quiet || printf("%d", kit_tests_list.v[i].line[j]);
             no_color || print_color(light);
             quiet || printf(" in \"");
             no_color || print_color(white);
-            quiet || printf("%s", kit_tests_list.tests[i].test_file +
+            quiet || printf("%s", kit_tests_list.v[i].test_file +
                                       file_root);
             no_color || print_color(light);
             quiet || printf("\" failed.\n");
diff --git a/source/kit_test/test.h b/source/kit_test/test.h
index 39c28e7..44aae09 100644
--- a/source/kit_test/test.h
+++ b/source/kit_test/test.h
@@ -35,7 +35,7 @@ typedef struct {
 
 typedef struct {
   int             size;
-  kit_test_case_t tests[KIT_TESTS_SIZE_LIMIT];
+  kit_test_case_t v[KIT_TESTS_SIZE_LIMIT];
 } kit_tests_list_t;
 
 extern kit_tests_list_t kit_tests_list;
diff --git a/source/test/unittests/foo.bench.c b/source/test/unittests/foo.bench.c
index a3d5c18..ac1e0b5 100644
--- a/source/test/unittests/foo.bench.c
+++ b/source/test/unittests/foo.bench.c
@@ -1,4 +1,4 @@
-#define KIT_BENCH_FILE foo
+#define KIT_TEST_FILE foo
 #include "../../kit_test/bench.h"
 
 struct test_foo_ {
@@ -6,8 +6,15 @@ struct test_foo_ {
 };
 
 BENCHMARK("foo") {
+
+  /*  Benchmark setup.
+   */
+
   BENCHMARK_BEGIN;
   {
+    /*  Measured code snippet.
+     */
+
     int              x = 0;
     struct test_foo_ f = { 0. };
 
@@ -16,10 +23,19 @@ BENCHMARK("foo") {
       x ^= i;
       f.f += 0.1;
     }
+
     DO_NOT_OPTIMIZE(x);
     DO_NOT_OPTIMIZE(f);
   }
   BENCHMARK_END;
 }
 
-BENCHMARK("bar") { }
+BENCHMARK("bar") {
+  BENCHMARK_REPEAT(10);
+  BENCHMARK_REPEAT(100);
+
+  BENCHMARK_BEGIN;
+  BENCHMARK_END;
+}
+
+BENCHMARK("empty") { }