gcc/testsuite/gcc.c-torture/execute/pr65215-5.c

   1 /* PR tree-optimization/65215 */
   2
   3 __attribute__((noinline, noclone)) unsigned int
   4 foo (unsigned char *p)
   5 {
   6   return ((unsigned int) p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
   7 }
   8
   9 __attribute__((noinline, noclone)) unsigned int
  10 bar (unsigned char *p)
  11 {
  12   return ((unsigned int) p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0];
  13 }
  14
  15 struct S { unsigned int a; unsigned char b[5]; };
  16
  17 int
  18 main ()
  19 {
  20   struct S s = { 1, { 2, 3, 4, 5, 6 } };
  21   if (__CHAR_BIT__ != 8 || sizeof (unsigned int) != 4)
  22     return 0;
  23   if (foo (&s.b[1]) != 0x03040506U
  24       || bar (&s.b[1]) != 0x06050403U)
  25     __builtin_abort ();
  26   return 0;
  27 }