gcc/testsuite/gcc.dg/pr27363.c

/* PR27363.  CSE was breaking on the arm store multiple insn used for
   structure copies.  */
/* { dg-do run } */
/* { dg-options "-Os" } */
extern void abort (void);

struct snd_mask {
    unsigned int bits[6];
};

static int __attribute__((noinline))
snd_mask_refine(struct snd_mask *mask)
{
  struct snd_mask old;

  old = *mask;
  if (mask->bits[0]==0 && mask->bits[1]==0)
    return 1;

  return old.bits[0] != mask->bits[0];
}

int main(int argc, char *argv[])
{
  struct snd_mask mask;


  mask.bits[0] = 23;
  mask.bits[1] = 42;
  mask.bits[2] = 0;
  mask.bits[3] = 0;
  mask.bits[4] = 0; 
  mask.bits[5] = 0;


  if (snd_mask_refine(&mask))
    abort();
  return 0;
}