gcc/testsuite/gcc.dg/pr27363.c

   1 /* PR27363.  CSE was breaking on the arm store multiple insn used for
   2    structure copies.  */
   3 /* { dg-do run } */
   4 /* { dg-options "-Os" } */
   5 extern void abort (void);
   6
   7 struct snd_mask {
   8     unsigned int bits[6];
   9 };
  10
  11 static int __attribute__((noinline))
  12 snd_mask_refine(struct snd_mask *mask)
  13 {
  14   struct snd_mask old;
  15
  16   old = *mask;
  17   if (mask->bits[0]==0 && mask->bits[1]==0)
  18     return 1;
  19
  20   return old.bits[0] != mask->bits[0];
  21 }
  22
  23 int main(int argc, char *argv[])
  24 {
  25   struct snd_mask mask;
  26
  27
  28   mask.bits[0] = 23;
  29   mask.bits[1] = 42;
  30   mask.bits[2] = 0;
  31   mask.bits[3] = 0;
  32   mask.bits[4] = 0;
  33   mask.bits[5] = 0;
  34
  35
  36   if (snd_mask_refine(&mask))
  37     abort();
  38   return 0;
  39 }