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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/104644] [12 Regression] ICE: SIGSEGV
 (infinite recursion in fold_binary_loc / fold_build2_loc /
 generic_simplify_NE_EXPR)
Date: Wed, 23 Feb 2022 08:14:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104644

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Created attachment 52494 [details]
> gcc12-pr104644.patch
>=20
> Untested fix.
>=20
> The match.pd optimization relies on (bswap @1) actually being simplified
> into something other than bswap when @1 is INTEGER_CST, but that isn't
> guaranteed at least in GENERIC - due to TREE_OVERFLOW in there.
> The patch uses ! to enforce simplification of that and because ! isn't
> supported in GENERIC, also requires GIMPLE for the optimization.

Huh, it's odd that GENERIC would care for TREE_OVERFLOW when constant foldi=
ng
bswap .. where does it do that?=