gcc/testsuite/gcc.dg/fold-cstring.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O" } */
   3
   4 /* The following are testcases for native_interpret_int,
   5    native_interpret_complex and native_interpret_vector decoding
   6    pieces of a string constant encoded by native_encode_string.  */
   7
   8 extern void abort (void);
   9
  10 /* We should fold all reads from xconstant and eliminate it, removing
  11    the reference to blah which cannot be resolved at link time.  */
  12 extern int blah;
  13
  14 static const struct {
  15     int *y;
  16     const char x[32] __attribute__((aligned(32)));
  17 } xconstant = { &blah, "01234567899876543210123456789000" };
  18
  19 typedef int v4si __attribute__((vector_size(16)));
  20
  21 int main()
  22 {
  23   if (sizeof (int) != 4)
  24     return 0;
  25   if (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
  26     {
  27       if (*(int *)&xconstant.x[4] != 0x34353637)
  28         abort ();
  29       if ((*(v4si *)&xconstant.x[16])[1] != 0x31323334)
  30         abort ();
  31       if (__imag (*(_Complex int *)&xconstant.x[8]) != 0x37363534)
  32         abort ();
  33     }
  34   else if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
  35     {
  36       if (*(int *)&xconstant.x[4] != 0x37363534)
  37         abort ();
  38       if ((*(v4si *)&xconstant.x[16])[1] != 0x34333231)
  39         abort ();
  40       if (__imag (*(_Complex int *)&xconstant.x[8]) != 0x34353637)
  41         abort ();
  42     }
  43   return 0;
  44 }