lib/tdb2/test/run-001-fls.c

   1 #include <ccan/tdb2/tdb.c>
   2 #include <ccan/tdb2/open.c>
   3 #include <ccan/tdb2/free.c>
   4 #include <ccan/tdb2/lock.c>
   5 #include <ccan/tdb2/io.c>
   6 #include <ccan/tdb2/hash.c>
   7 #include <ccan/tdb2/transaction.c>
   8 #include <ccan/tdb2/check.c>
   9 #include <ccan/tap/tap.h>
  10
  11 static unsigned int dumb_fls(uint64_t num)
  12 {
  13         int i;
  14
  15         for (i = 63; i >= 0; i--) {
  16                 if (num & (1ULL << i))
  17                         break;
  18         }
  19         return i + 1;
  20 }
  21
  22 int main(int argc, char *argv[])
  23 {
  24         unsigned int i, j;
  25
  26         plan_tests(64 * 64 + 2);
  27
  28         ok1(fls64(0) == 0);
  29         ok1(dumb_fls(0) == 0);
  30
  31         for (i = 0; i < 64; i++) {
  32                 for (j = 0; j < 64; j++) {
  33                         uint64_t val = (1ULL << i) | (1ULL << j);
  34                         ok(fls64(val) == dumb_fls(val),
  35                            "%llu -> %u should be %u", (long long)val,
  36                            fls64(val), dumb_fls(val));
  37                 }
  38         }
  39         return exit_status();
  40 }