sys/external/bsd/compiler_rt/dist/test/Unit/paritydi2_test.c

   1 //===-- paritydi2_test.c - Test __paritydi2 -------------------------------===//
   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 __paritydi2 for the compiler_rt library.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "int_lib.h"
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17
  18 // Returns: 1 if number of bits is odd else returns 0
  19
  20 si_int __paritydi2(di_int a);
  21
  22 int naive_parity(di_int a)
  23 {
  24     int r = 0;
  25     for (; a; a = a & (a - 1))
  26         r = ~r;
  27     return r & 1;
  28 }
  29
  30 int test__paritydi2(di_int a)
  31 {
  32     si_int x = __paritydi2(a);
  33     si_int expected = naive_parity(a);
  34     if (x != expected)
  35         printf("error in __paritydi2(0x%llX) = %d, expected %d\n",
  36                a, x, expected);
  37     return x != expected;
  38 }
  39
  40 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
  41 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
  42
  43 int main()
  44 {
  45     int i;
  46     for (i = 0; i < 10000; ++i)
  47         if (test__paritydi2(((di_int)rand() << 32) + rand()))
  48             return 1;
  49
  50    return 0;
  51 }