--- /dev/null
+#include "ntdb-source.h"
+#include "tap-interface.h"
+
+static unsigned int dumb_fls(uint64_t num)
+{
+ int i;
+
+ for (i = 63; i >= 0; i--) {
+ if (num & (1ULL << i))
+ break;
+ }
+ return i + 1;
+}
+
+int main(int argc, char *argv[])
+{
+ unsigned int i, j;
+
+ plan_tests(64 * 64 + 2);
+
+ ok1(fls64(0) == 0);
+ ok1(dumb_fls(0) == 0);
+
+ for (i = 0; i < 64; i++) {
+ for (j = 0; j < 64; j++) {
+ uint64_t val = (1ULL << i) | (1ULL << j);
+ ok(fls64(val) == dumb_fls(val),
+ "%llu -> %u should be %u", (long long)val,
+ fls64(val), dumb_fls(val));
+ }
+ }
+ return exit_status();
+}