[Bug tree-optimization/116556] __builtin_object_size does not handle `ptr + (PHI<4,8>)`, only `PHI`

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116556

--- Comment #2 from Siddhesh Poyarekar <siddhesh at gcc dot gnu.org> ---
The problem here is that the expression generated is:

  # t_1 = PHI <8(2), 4(3)>
  p_6 = buf2_4 + t_1;

where tree-object-size then bails out because it can only handle (PTR or
ADDR_EXPR) + INTEGER_CST, because of which it bails out.  I've posted a patch.