https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105554
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, I have tried
--- gcc/cgraphclones.cc.jj 2023-02-24 11:05:19.704595633 +0100
+++ gcc/cgraphclones.cc 2023-03-16 19:12:30.452503051 +0100
@@ -1094,6 +1094,15 @@ cgraph_node::create_version_clone_with_b
|| in_lto_p)
new_version_node->unique_name = true;
+ if (target_attributes)
+ {
+ push_cfun (DECL_STRUCT_FUNCTION (new_decl));
+ for (tree arg = DECL_ARGUMENTS (new_decl); arg; arg = DECL_CHAIN (arg))
+ if (VECTOR_TYPE_P (TREE_TYPE (arg)))
+ SET_DECL_MODE (arg, TYPE_MODE (TREE_TYPE (arg)));
+ pop_cfun ();
+ }
+
/* Update the call_expr on the edges to call the new version node. */
update_call_expr (new_version_node);
but that really didn't help, the problem seems to be actually different.
>From what I can see, tree_function_versioning does:
6240 DECL_RESULT (new_decl) = DECL_RESULT (old_decl);
6241 DECL_ARGUMENTS (new_decl) = DECL_ARGUMENTS (old_decl);
6242 initialize_cfun (new_decl, old_decl,
6243 new_entry ? new_entry->count :
old_entry_block->count);
and initialize_cfun will call allocate_function, which does:
4845 /* Now that we have activated any function-specific
attributes
4846 that might affect layout, particularly vector modes,
relayout
4847 each of the parameters and the result. */
4848 relayout_decl (result);
4849 for (tree parm = DECL_ARGUMENTS (fndecl); parm;
4850 parm = DECL_CHAIN (parm))
4851 relayout_decl (parm);
So, we temporarily set DECL_ARGUMENTS and DECL_RESULT of new_decl to
arguments/result of old_decl and allocate_function called relayout_decl on
those, later on we create new arguments (which supposedly have correct
DECL_MODE). But we've changed the old DECL_RESULT/DECL_ARGUMENTS.
