gcc/testsuite/gcc.dg/pr29215.c

   1 /* PR middle-end/29215 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fdump-tree-ccp1" } */
   4
   5 char buf[5 * sizeof (int) + 1] __attribute__((aligned (__alignof__ (int))));
   6
   7 static void
   8 foo (int arg1, int arg2, int arg3, int arg4, int arg5)
   9 {
  10   __builtin_memcpy (buf, &arg1, sizeof (int));
  11   __builtin_memcpy (buf + sizeof (int), &arg2, sizeof (int));
  12   __builtin_memcpy (buf + 2 * sizeof (int), &arg3, sizeof (int));
  13   __builtin_memcpy (buf + 3 * sizeof (int), &arg4, sizeof (int));
  14   __builtin_memcpy (buf + 4 * sizeof (int), &arg5, sizeof (int));
  15 }
  16
  17 int
  18 main (void)
  19 {
  20   union { char buf[4]; int i; } u;
  21   u.i = 0;
  22   u.buf[0] = 'a';
  23   u.buf[1] = 'b';
  24   u.buf[2] = 'c';
  25   u.buf[3] = 'd';
  26   foo (u.i, u.i, u.i, u.i, u.i);
  27   buf[5 * sizeof (int)] = '\0';
  28   __builtin_puts (buf);
  29   return 0;
  30 }
  31
  32 /* { dg-final { scan-tree-dump-not "memcpy" "ccp1" } } */