compiler-rt/test/builtins/Unit/popcountdi2_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_popcountdi2
   3
   4 #include "int_lib.h"
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7
   8 // Returns: count of 1 bits
   9
  10 COMPILER_RT_ABI int __popcountdi2(di_int a);
  11
  12 int naive_popcount(di_int a)
  13 {
  14     int r = 0;
  15     for (; a; a = (du_int)a >> 1)
  16         r += a & 1;
  17     return r;
  18 }
  19
  20 int test__popcountdi2(di_int a)
  21 {
  22     int x = __popcountdi2(a);
  23     int expected = naive_popcount(a);
  24     if (x != expected)
  25         printf("error in __popcountdi2(0x%llX) = %d, expected %d\n",
  26                a, x, expected);
  27     return x != expected;
  28 }
  29
  30 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
  31 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
  32
  33 int main()
  34 {
  35     if (test__popcountdi2(0))
  36         return 1;
  37     if (test__popcountdi2(1))
  38         return 1;
  39     if (test__popcountdi2(2))
  40         return 1;
  41     if (test__popcountdi2(0xFFFFFFFFFFFFFFFDLL))
  42         return 1;
  43     if (test__popcountdi2(0xFFFFFFFFFFFFFFFELL))
  44         return 1;
  45     if (test__popcountdi2(0xFFFFFFFFFFFFFFFFLL))
  46         return 1;
  47     int i;
  48     for (i = 0; i < 10000; ++i)
  49         if (test__popcountdi2(((di_int)rand() << 32) | rand()))
  50             return 1;
  51
  52    return 0;
  53 }