[Bug middle-end/86711] New: wrong folding of memchr

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86711

            Bug ID: 86711
           Summary: wrong folding of memchr
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bernd.edlinger at hotmail dot de
  Target Milestone: ---

This example generates wrong code:

$ cat part.c
static const char a[2][4] = { "1234", "5678" };

int main ()
{
  void *p = __builtin_memchr (a, 0, 5);

  if (p)
    __builtin_abort ();
}

$ gcc part.c
$ ./a.out
Aborted (core dumped)