[Bug middle-end/104757] [12 Regression] ICE (segfault) GIMPLE pass: walloca - in gimple_range_global

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104757

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Tobias Burnus from comment #3)
> (In reply to Thomas Schwinge from comment #1)
> > Confirmed ever since commit 48c6cac9caea1dc7c5f50ad3a736f6693e74a11b
> which was committed on 'Nov 12 17:58:21 2021'. — However, that's a FE-only
> patch which only affects parsing.
> 
>  * * *
> 
> The ICE/segfault is in  ranger_cache::get_global_range (irange &r, tree
> name) const   for
> 923       r = gimple_range_global (name);
> 
> (gdb) p debug_tree(name)
>  <ssa_name 0x7ffff6fd1798
>     type <boolean_type 0x7ffff6fed150 logical(kind=4) public unsigned SI
>     ...
> 
> which is a 4-byte Boolean value.

you don't quote more but I guess this name is released and thus has a NULL
SSA_NAME_DEF_STMT so the is_a check crashes.

  if (SSA_NAME_IS_DEFAULT_DEF (name) || (cfun && cfun->after_inlining)
      || is_a<gphi *> (SSA_NAME_DEF_STMT (name)))