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 /* { dg-xfail-if "" { powerpc-ibm-aix* } } */
   5
   6 struct fdt_header { unsigned magic; } *a;
   7
   8 int d;
   9
  10 int
  11 __fswab32 (int p1)
  12 {
  13   return __builtin_bswap32 (p1);
  14 }
  15
  16 void
  17 fdt_set_magic (int p1)
  18 {
  19   struct fdt_header *b = a;
  20   b->magic = __builtin_constant_p (p1) ? : __fswab32 (p1);
  21 }
  22
  23 int
  24 _fdt_sw_check_header ()
  25 {
  26   int c = ((struct fdt_header *) 1)->magic;
  27   if (c)
  28     return 1;
  29   return 0;
  30 }
  31
  32 int
  33 fdt_finish ()
  34 {
  35   if (_fdt_sw_check_header ())
  36     if (d)
  37       return 0;
  38   fdt_set_magic (0);
  39   return 0;
  40 }