sys/external/bsd/compiler_rt/dist/test/Unit/popcountsi2_test.c

   1 //===-- popcountsi2_test.c - Test __popcountsi2 ---------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file tests __popcountsi2 for the compiler_rt library.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "int_lib.h"
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17
  18 // Returns: count of 1 bits
  19
  20 si_int __popcountsi2(si_int a);
  21
  22 int naive_popcount(si_int a)
  23 {
  24     int r = 0;
  25     for (; a; a = (su_int)a >> 1)
  26         r += a & 1;
  27     return r;
  28 }
  29
  30 int test__popcountsi2(si_int a)
  31 {
  32     si_int x = __popcountsi2(a);
  33     si_int expected = naive_popcount(a);
  34     if (x != expected)
  35         printf("error in __popcountsi2(0x%X) = %d, expected %d\n",
  36                a, x, expected);
  37     return x != expected;
  38 }
  39
  40 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
  41
  42 int main()
  43 {
  44     if (test__popcountsi2(0))
  45         return 1;
  46     if (test__popcountsi2(1))
  47         return 1;
  48     if (test__popcountsi2(2))
  49         return 1;
  50     if (test__popcountsi2(0xFFFFFFFD))
  51         return 1;
  52     if (test__popcountsi2(0xFFFFFFFE))
  53         return 1;
  54     if (test__popcountsi2(0xFFFFFFFF))
  55         return 1;
  56     int i;
  57     for (i = 0; i < 10000; ++i)
  58         if (test__popcountsi2(rand()))
  59             return 1;
  60
  61    return 0;
  62 }