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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/107976] ICE: SIGSEGV (stack overflow) in
 emit_case_dispatch_table (stmt.cc:783) with large
 --param=jump-table-max-growth-ratio-for-speed
Date: Tue, 06 Dec 2022 09:31:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107976

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
>   ncases =3D tree_to_shwi (range) + 1;
>   labelvec =3D XALLOCAVEC (rtx, ncases);
>   memset (labelvec, 0, ncases * sizeof (rtx));
>=20
>=20
> I think this is a won't fix.
> Doctor, it hurts when I bend my arm this way.
> Don't bend it that way then.

Changing the above to heap allocation would be easy - of course we'd genera=
te
a huge number of labels then which eventually will lead to different issues.

Using heap allocation or an auto_vec and capping the maximum of
jump-table-max-growth-ratio-for-{size,speed} to something sensible
(the defaults are 300 and 800) would be appropriate I think.=