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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [testsuite/] [gcc.c-torture/] [execute/] [arith-rand.c] - Blame information for rev 856

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Line No. Rev Author Line
1 149 jeremybenn 
long
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simple_rand ()
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{
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  static unsigned long seed = 47114711;
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  unsigned long this = seed * 1103515245 + 12345;
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  seed = this;
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  return this >> 8;
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}
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unsigned long int
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random_bitstring ()
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{
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  unsigned long int x;
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  int n_bits;
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  long ran;
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  int tot_bits = 0;
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  x = 0;
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  for (;;)
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    {
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      ran = simple_rand ();
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      n_bits = (ran >> 1) % 16;
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      tot_bits += n_bits;
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      if (n_bits == 0)
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        return x;
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      else
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        {
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          x <<= n_bits;
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          if (ran & 1)
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            x |= (1 << n_bits) - 1;
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          if (tot_bits > 8 * sizeof (long) + 6)
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            return x;
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        }
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    }
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}
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#define ABS(x) ((x) >= 0 ? (x) : -(x))
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main ()
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{
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  long int i;
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  for (i = 0; i < 1000; i++)
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    {
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      unsigned long x, y;
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      x = random_bitstring ();
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      y = random_bitstring ();
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      if (sizeof (int) == sizeof (long))
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        goto save_time;
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      { unsigned long xx = x, yy = y, r1, r2;
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        if (yy == 0) continue;
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        r1 = xx / yy;
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        r2 = xx % yy;
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        if (r2 >= yy || r1 * yy + r2 != xx)
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          abort ();
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      }
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      { signed long xx = x, yy = y, r1, r2;
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        if ((unsigned long) xx << 1 == 0 && yy == -1)
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          continue;
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        r1 = xx / yy;
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        r2 = xx % yy;
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        if (ABS (r2) >= (unsigned long) ABS (yy) || (signed long) (r1 * yy + r2) != xx)
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          abort ();
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      }
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    save_time:
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      { unsigned int xx = x, yy = y, r1, r2;
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        if (yy == 0) continue;
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        r1 = xx / yy;
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        r2 = xx % yy;
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        if (r2 >= yy || r1 * yy + r2 != xx)
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          abort ();
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      }
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      { signed int xx = x, yy = y, r1, r2;
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        if ((unsigned int) xx << 1 == 0 && yy == -1)
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          continue;
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        r1 = xx / yy;
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        r2 = xx % yy;
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        if (ABS (r2) >= (unsigned int) ABS (yy) || (signed int) (r1 * yy + r2) != xx)
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          abort ();
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      }
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      { unsigned short xx = x, yy = y, r1, r2;
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        if (yy == 0) continue;
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        r1 = xx / yy;
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        r2 = xx % yy;
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        if (r2 >= yy || r1 * yy + r2 != xx)
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          abort ();
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      }
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      { signed short xx = x, yy = y, r1, r2;
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        r1 = xx / yy;
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        r2 = xx % yy;
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        if (ABS (r2) >= (unsigned short) ABS (yy) || (signed short) (r1 * yy + r2) != xx)
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          abort ();
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      }
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      { unsigned char xx = x, yy = y, r1, r2;
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        if (yy == 0) continue;
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        r1 = xx / yy;
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        r2 = xx % yy;
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        if (r2 >= yy || r1 * yy + r2 != xx)
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          abort ();
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      }
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      { signed char xx = x, yy = y, r1, r2;
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        r1 = xx / yy;
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        r2 = xx % yy;
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        if (ABS (r2) >= (unsigned char) ABS (yy) || (signed char) (r1 * yy + r2) != xx)
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          abort ();
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      }
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    }
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  exit (0);
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}

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