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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113467] [14 regression] libgcrypt-1.10.3 is
 miscompiled
Date: Thu, 18 Jan 2024 08:51:26 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113467

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #7)
> Does the following fix the issue?
>=20
> diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
> index 330c4571c8d..b67ee783002 100644
> --- a/gcc/tree-vect-loop.cc
> +++ b/gcc/tree-vect-loop.cc
> @@ -998,6 +1000,9 @@ vec_init_loop_exit_info (class loop *loop)
>         }
>      }
>=20=20
> +  if (candidate->src !=3D single_pred (loop->latch))
> +    return NULL;
> +
>    return candidate;
>  }

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 330c4571c8d..5261c1d4fa0 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -998,6 +1000,9 @@ vec_init_loop_exit_info (class loop *loop)
        }
     }

+  if (candidate && candidate->src !=3D single_pred (loop->latch))
+    return NULL;
+
   return candidate;
 }

of course=