checkasm: Explicitly test whether the readtime() function works

This gives a clearer indication about what is wrong, instead of
running into illegal instruction errors in the individual tests.

On ARM and AArch64, access to the cycle counter register is forbidden
in user mode code by default on Linux and Darwin.

1 files changed, 19 insertions, 2 deletions

diff --git a/tests/checkasm/checkasm.c b/tests/checkasm/checkasm.c
index ee52c89..2bf15d8 100644
--- a/tests/checkasm/checkasm.c
+++ b/tests/checkasm/checkasm.c
@@ -520,7 +520,6 @@ static void print_cpu_name(void) {
 int main(int argc, char *argv[]) {
     (void)func_new, (void)func_ref;
     state.seed = get_seed();
-    int ret = 0;
 
     while (argc > 1) {
         if (!strncmp(argv[1], "--help", 6)) {
@@ -568,6 +567,22 @@ int main(int argc, char *argv[]) {
 
     dav1d_init_cpu();
 
+    if (state.bench_pattern) {
+        static int testing = 0;
+        checkasm_save_context();
+        if (!testing) {
+            checkasm_set_signal_handler_state(1);
+            testing = 1;
+            readtime();
+            checkasm_set_signal_handler_state(0);
+        } else {
+            fprintf(stderr, "checkasm: unable to access cycle counter\n");
+            return 1;
+        }
+    }
+
+    int ret = 0;
+
     if (!state.function_listing) {
         fprintf(stderr, "checkasm: using random seed %u\n", state.seed);
 #if ARCH_X86_64
@@ -672,7 +687,9 @@ int checkasm_bench_func(void) {
 /* Indicate that the current test has failed, return whether verbose printing
  * is requested. */
 int checkasm_fail_func(const char *const msg, ...) {
-    if (state.current_func_ver->cpu && state.current_func_ver->ok) {
+    if (state.current_func_ver && state.current_func_ver->cpu &&
+        state.current_func_ver->ok)
+    {
         va_list arg;
 
         print_cpu_name();