Comment 15 for bug 1862053

Here's the minimal test case using options -O3 -mcpu=power8 -fstack-protector-strong:

void bar();
char b;
void
foo (void)
{
  char a;
  int d = b;
  char *e = &a;
  while (d)
    *e++ = --d;
  bar ();
}