[Bug middle-end/113731] [14 regression] ICE when building libbsd since r14-8768-g85094e2aa6dba7

["tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113731

Tamar Christina <tnfchris at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2024-02-03
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |tnfchris at gcc dot gnu.org

--- Comment #4 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
blah,

      gsi_move_before (&stmt_gsi, &dest_gsi);

when dest_gsi is empty does not move the pointer.  It's not mentioned in the
description but in the function it eventually calls gsi_insert_before there's a
comment

/* If CUR is NULL, we link at the end of the sequence (this case happens

so it adds it to the end instead of start like you asked.

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 30b90d99925..e2587315020 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -11801,7 +11801,8 @@ move_early_exit_stmts (loop_vec_info loop_vinfo)

       gimple_stmt_iterator stmt_gsi = gsi_for_stmt (stmt);
       gsi_move_before (&stmt_gsi, &dest_gsi);
-      gsi_prev (&dest_gsi);
+      if (!gsi_end_p (dest_gsi))
+       gsi_prev (&dest_gsi);
     }

fixes it.

the libarchive, is that also with -march=znver2? and is
https://github.com/libarchive/libarchive?