[lno] "no flow-sensitive alias info" warning to vectorizer

[law@redhat.com]

In message <1077816117.16194.446.camel@localhost.localdomain>, Diego Novillo wr
ites:
 >On Wed, 2004-02-25 at 02:22, Zdenek Dvorak wrote:
 >
 >>   if (TREE_CODE (op) == SSA_NAME)
 >>     {
 >>       /* We need to add a memory tag for the variable.  But we do not want
 >>          to add it to the temporary used for the computations, since this l
 >eads
 >>          to problems in redundancy elimination when there are common parts
 >>          in two computations refering to the different arrays.  So we rewri
 >te
 >>          the base variable of the ssa name to a new temporary.  */
 >>       tmp_var = create_tmp_var (TREE_TYPE (op), "ruatmp");
 >>       add_referenced_tmp_var (tmp_var);
 >>       SSA_NAME_VAR (op) = tmp_var;
 >> 
 >>       var = get_base_decl (*use->op_p);
 >>       if (var_ann (var)->type_mem_tag)
 >>         var = var_ann (var)->type_mem_tag;
 >>       var_ann (tmp_var)->type_mem_tag = var;
 >> 
 >>       name = get_base_var (*use->op_p);
 >>       if (name && TREE_CODE (name) == SSA_NAME)
 >>         {
 >>           ssa_name_ann_t ann = ssa_name_ann (name), new_ann;
 >> 
 >>           if (ann && ann->name_mem_tag)
 >>             {
 >>               new_ann = get_ssa_name_ann (op);
 >>               new_ann->name_mem_tag = ann->name_mem_tag;
 >>             }
 >>         }
 >>     }
 >> 
 >So, you're replacing all the VAR_DECLs inside SSA_NAMEs with something
 >new?  Yeah, I guess you need to do all this.
It would be good if this code could be moved into tree-ssa-copy.c
since it deals with keeping this kind of stuff up-to-date.

jeff