gcc/testsuite/gcc.dg/pr35258.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O1" } */
   3
   4 extern void *memcpy (void *, const void *, __SIZE_TYPE__);
   5 extern int memcmp (const void *, const void *, __SIZE_TYPE__);
   6 extern void abort(void);
   7
   8 char str[9] = "1234";
   9
  10 void
  11 bar (void)
  12 {
  13 #if __SIZEOF_INT__ >= 4
  14   unsigned int temp;
  15 #else
  16   __UINT32_TYPE__ temp;
  17 #endif
  18   char *p = &str[2];
  19
  20   memcpy (&temp, &str[1], 4);
  21   memcpy (p, &temp, 4);
  22   str[1] = '.';
  23 }
  24
  25 int main()
  26 {
  27   bar();
  28   if (memcmp (str, "1.234", 5) != 0)
  29     abort ();
  30
  31   return 0;
  32 }