compiler-rt/test/builtins/Unit/popcountsi2_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_popcountsi2
   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 __popcountsi2(si_int a);
  11
  12 int naive_popcount(si_int a)
  13 {
  14     int r = 0;
  15     for (; a; a = (su_int)a >> 1)
  16         r += a & 1;
  17     return r;
  18 }
  19
  20 int test__popcountsi2(si_int a)
  21 {
  22     si_int x = __popcountsi2(a);
  23     si_int expected = naive_popcount(a);
  24     if (x != expected)
  25         printf("error in __popcountsi2(0x%X) = %d, expected %d\n",
  26                a, x, expected);
  27     return x != expected;
  28 }
  29
  30 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
  31
  32 int main()
  33 {
  34     if (test__popcountsi2(0))
  35         return 1;
  36     if (test__popcountsi2(1))
  37         return 1;
  38     if (test__popcountsi2(2))
  39         return 1;
  40     if (test__popcountsi2(0xFFFFFFFD))
  41         return 1;
  42     if (test__popcountsi2(0xFFFFFFFE))
  43         return 1;
  44     if (test__popcountsi2(0xFFFFFFFF))
  45         return 1;
  46     int i;
  47     for (i = 0; i < 10000; ++i)
  48         if (test__popcountsi2(rand()))
  49             return 1;
  50
  51    return 0;
  52 }