gcc/testsuite/gcc.dg/pr66688.c

   1 /* PR tree-optimization/66688 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fno-reorder-blocks -fcompare-debug" } */
   4
   5 struct fdt_header { unsigned magic; } *a;
   6
   7 int d;
   8
   9 int
  10 __fswab32 (int p1)
  11 {
  12   return __builtin_bswap32 (p1);
  13 }
  14
  15 void
  16 fdt_set_magic (int p1)
  17 {
  18   struct fdt_header *b = a;
  19   b->magic = __builtin_constant_p (p1) ? : __fswab32 (p1);
  20 }
  21
  22 int
  23 _fdt_sw_check_header ()
  24 {
  25   int c = ((struct fdt_header *) 1)->magic;
  26   if (c)
  27     return 1;
  28   return 0;
  29 }
  30
  31 int
  32 fdt_finish ()
  33 {
  34   if (_fdt_sw_check_header ())
  35     if (d)
  36       return 0;
  37   fdt_set_magic (0);
  38   return 0;
  39 }