gcc/testsuite/gcc.dg/memcpy-2.c

   1 /* PR middle-end/38454 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fno-tree-dse" } */
   4
   5 typedef __SIZE_TYPE__ size_t;
   6
   7 extern inline __attribute__((gnu_inline, always_inline, artificial)) void *
   8 memcpy (void *__restrict dest, const void *__restrict src, size_t len)
   9 {
  10   return __builtin___memcpy_chk (dest, /* { dg-warning "writing" } */
  11                                  src, len, __builtin_object_size (dest, 0));
  12 }
  13
  14 struct S { char buf[10]; } s;
  15
  16 void
  17 foo (void)
  18 {
  19   char buf[12];
  20   char *p = buf + 4;
  21   struct S *q = (struct S *) p;
  22   memcpy (q, &s, sizeof (s));
  23 }
  24
  25 /* { dg-final { scan-assembler "__memcpy_chk" } } */