[Bug tree-optimization/32705] [4.3 regression] ICE in set_ssa_val_to, at tree-ssa-sccvn.c:1022

["dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #6 from dberlin at gcc dot gnu dot org  2007-07-11 22:20 -------
Subject: Re:  [4.3 regression] ICE in set_ssa_val_to, at tree-ssa-sccvn.c:1022

The only way i can see this happening is if you have a truly
uninitialized variable, or there is something we have missed.

Does this function have cfun->static_chain_decl being used, and we
have a copy of that here?

It is theoretically safe to call set_ssa_to_val with to == vn_top, but
it's probably a bug somewhere, and i'd rather eliminate the bug cases
before turning it off.

On 11 Jul 2007 20:10:10 -0000, ebotcazou at gcc dot gnu dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #5 from ebotcazou at gcc dot gnu dot org  2007-07-11 20:10 -------
> > Can someone paste the output of debug_generic_stmt (to) and
> > debug_tree(to) at the point of failure?
>
> (gdb) p debug_tree(to)
>  <var_decl 0x557f7114 vn_top.181
>     type <void_type 0x55716804 void sizes-gimplified visited VOID
>         align 8 symtab 0 alias set 36 canonical type 0x55716804
>         pointer_to_this <pointer_type 0x55716870>>
>     used ignored VOID file ../c87b26b.adb line 4
>     align 8>
> $4 = void
> (gdb) p debug_generic_stmt(to)
> vn_top.181
>
>
> --
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32705
>
>


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32705