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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111699] [14 Regression] ICE: SIGSEGV: infinite
 recursion in fold_build3_loc/fold_ternary_loc/generic_simplify_VEC_COND_EXPR
Date: Thu, 05 Oct 2023 17:40:40 +0000
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X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: ice-on-valid-code, needs-bisection
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111699

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(simplify
 (vec_cond (vec_cond:s @0 @3 integer_zerop) @1 @2)
 (if (optimize_vectors_before_lowering_p () && types_match (@0, @3))
  (vec_cond (bit_and @0 @3) @1 @2)))

goes into an infinite loop with fold_build3 as the fold_build2:BIT_AND of:
(gdb) p debug_generic_expr(captures[1])
v =3D=3D { 0, 0, 0, 0, 0, 0, 0, 0 }
$9 =3D void
(gdb) p debug_generic_expr(captures[2])
{ 0, -1, -1, -1, -1, -1, -1, -1 }

Creates a vec_cond ...=