File: pr84524.c

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gcc-arm-none-eabi 15%3A12.2.rel1-1
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/* PR target/84524 */

__attribute__((noipa)) void
foo (unsigned short *x)
{
  unsigned short i, v;
  unsigned char j;
  for (i = 0; i < 256; i++)
    {
      v = i << 8;
      for (j = 0; j < 8; j++)
	if (v & 0x8000)
	  v = (v << 1) ^ 0x1021;
	else
	  v = v << 1;
      x[i] = v;
    }
}

int
main ()
{
  unsigned short a[256];

  foo (a);
  for (int i = 0; i < 256; i++)
    {
      unsigned short v = i << 8;
      for (int j = 0; j < 8; j++)
	{
	  asm volatile ("" : "+r" (v));
	  if (v & 0x8000)
	    v = (v << 1) ^ 0x1021;
	  else
	    v = v << 1;
	}
      if (a[i] != v)
	__builtin_abort ();
    }
  return 0;
}