115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
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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