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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/110744] [14 regression] gcc.dg/tree-ssa/pr84512.c fails
 after r14-2267-gb8806f6ffbe72
Date: Thu, 20 Jul 2023 04:22:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110744

--- Comment #6 from Kewen Lin <linkw at gcc dot gnu.org> ---
The root cause is that the length and bias handling about LEN_STORE in sccvn
was missed to be updated, the below diff can fix the failure.

diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 11061a374a2..c0b3ec420c5 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -3299,11 +3299,14 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void
*data_,
            return (void *)-1;
          break;
        case IFN_LEN_STORE:
-         len =3D gimple_call_arg (call, 2);
-         bias =3D gimple_call_arg (call, 4);
-         if (!tree_fits_uhwi_p (len) || !tree_fits_shwi_p (bias))
-           return (void *)-1;
-         break;
+         {
+           int len_index =3D internal_fn_len_index (fn);
+           len =3D gimple_call_arg (call, len_index);
+           bias =3D gimple_call_arg (call, len_index + 1);
+           if (!tree_fits_uhwi_p (len) || !tree_fits_shwi_p (bias))
+             return (void *) -1;
+           break;
+         }
        default:
          return (void *)-1;
        }

Fully testing it.=