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

   1 #include "ntdb-source.h"
   2 #include "tap-interface.h"
   3
   4 static unsigned int dumb_fls(uint64_t num)
   5 {
   6         int i;
   7
   8         for (i = 63; i >= 0; i--) {
   9                 if (num & (1ULL << i))
  10                         break;
  11         }
  12         return i + 1;
  13 }
  14
  15 int main(int argc, char *argv[])
  16 {
  17         unsigned int i, j;
  18
  19         plan_tests(64 * 64 + 2);
  20
  21         ok1(fls64(0) == 0);
  22         ok1(dumb_fls(0) == 0);
  23
  24         for (i = 0; i < 64; i++) {
  25                 for (j = 0; j < 64; j++) {
  26                         uint64_t val = (1ULL << i) | (1ULL << j);
  27                         ok(fls64(val) == dumb_fls(val),
  28                            "%llu -> %u should be %u", (long long)val,
  29                            fls64(val), dumb_fls(val));
  30                 }
  31         }
  32         return exit_status();
  33 }