none/tests/s390x/popcnt.c

   1 #include <stdio.h>
   2 #include <stdint.h>
   3
   4
   5 static void check_popcnt(uint64_t in, uint64_t expected_result,
   6                          int expected_cc)
   7 {
   8    uint64_t out = ~expected_result;
   9    int cc = ~expected_cc;
  10
  11    asm volatile(".insn rre, 0xb9e10000, %[out], %[in]\n\t"
  12                 "ipm     %[cc]\n\t"
  13                 "srl     %[cc],28\n\t"
  14                 : [cc]"=d" (cc), [out]"=d" (out)
  15                 : [in]"d" (in)
  16                 : "cc");
  17    printf("popcnt %16lx -> %16lx %s  cc=%d %s\n",
  18           in, out, (out == expected_result ? "   " : "ERR"),
  19           cc, (cc == expected_cc ? "   " : "ERR"));
  20 }
  21
  22 int main()
  23 {
  24    check_popcnt(0, 0, 0);
  25    check_popcnt(1, 1, 1);
  26    check_popcnt(0x8000000000000000ULL, 0x0100000000000000ULL, 1);
  27    check_popcnt(0xffffffffffffffffULL, 0x0808080808080808ULL, 1);
  28    check_popcnt(0xff427e3800556bcdULL, 0x0802060300040505ULL, 1);
  29    return 0;
  30 }