[Bug tree-optimization/118852] [15 regression] Train run of 502.gcc_r compiled with -Ofast -fprofile-generate -march=x86_64-v3 fails

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118852

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
A testcase would be the following - we don't perform loop-header copying
for an isolated testcase, thus manually here.

void *
foo (void **p, void **limit)
{
  if (++p < limit)
    do
      {
        void *x = *p;
        if (x != (void *)0 && x != (void *)1)
          return x;
      }
    while (++p < limit);
  return (void *)0;
}

I can't spot what is wrong here with the vectorization off-head.