gcc/testsuite/gcc.c-torture/execute/pr84524.c

   1 /* PR target/84524 */
   2
   3 __attribute__((noipa)) void
   4 foo (unsigned short *x)
   5 {
   6   unsigned short i, v;
   7   unsigned char j;
   8   for (i = 0; i < 256; i++)
   9     {
  10       v = i << 8;
  11       for (j = 0; j < 8; j++)
  12         if (v & 0x8000)
  13           v = (v << 1) ^ 0x1021;
  14         else
  15           v = v << 1;
  16       x[i] = v;
  17     }
  18 }
  19
  20 int
  21 main ()
  22 {
  23   unsigned short a[256];
  24
  25   foo (a);
  26   for (int i = 0; i < 256; i++)
  27     {
  28       unsigned short v = i << 8;
  29       for (int j = 0; j < 8; j++)
  30         {
  31           asm volatile ("" : "+r" (v));
  32           if (v & 0x8000)
  33             v = (v << 1) ^ 0x1021;
  34           else
  35             v = v << 1;
  36         }
  37       if (a[i] != v)
  38         __builtin_abort ();
  39     }
  40   return 0;
  41 }