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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/106246] [13 Regression] powerpc-darwin9
 bootstrap fails after r13-1575-gcf3a120084e946 ICE vect_transform_loops, at
 tree-vectorizer.cc:1032
Date: Mon, 11 Jul 2022 09:47:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106246

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, indeed this is caused by my most recent change.  The following should f=
ix
this, I'm going to test this on x86_64-linux (no convenient ppc testing mac=
hine
available for me right now)

diff --git a/gcc/tree-vect-data-refs.cc b/gcc/tree-vect-data-refs.cc
index 53e52cb58cb..609cacc4971 100644
--- a/gcc/tree-vect-data-refs.cc
+++ b/gcc/tree-vect-data-refs.cc
@@ -5777,14 +5777,14 @@ vect_setup_realignment (vec_info *vinfo, stmt_vec_i=
nfo
stmt_info,
   if (at_loop)
     *at_loop =3D loop_for_initial_load;

+  tree vuse =3D NULL_TREE;
   if (loop_for_initial_load)
-    pe =3D loop_preheader_edge (loop_for_initial_load);
-
-  tree vuse;
-  gphi *vphi =3D get_virtual_phi (loop_for_initial_load->header);
-  if (vphi)
-    vuse =3D PHI_ARG_DEF_FROM_EDGE (vphi, pe);
-  else
+    {
+      pe =3D loop_preheader_edge (loop_for_initial_load);
+      if (gphi *vphi =3D get_virtual_phi (loop_for_initial_load->header))
+       vuse =3D PHI_ARG_DEF_FROM_EDGE (vphi, pe);
+    }
+  if (!vuse)
     vuse =3D gimple_vuse (gsi_stmt (*gsi));

   /* 3. For the case of the optimized realignment, create the first vector=