On Tue, Apr 13, 2010 at 13:14, Sebastian Pop <seb...@gmail.com> wrote:
> Hi,
>
> While working on the tree-if-conv.c, I realized that the copy
> of the contents of a non scalar variable are not correctly done.
> The copy assignment triggers this error:
>
> error: virtual SSA name for non-VOP decl
> while verifying SSA_NAME _ifc_.2005_46 in statement
> # .MEM_394 = VDEF <.MEM_475>
> _ifc_.2005_46 = ops[j_457];
>
> The array reference looks like this:
>
> <array_ref 0x7ffff4bd65a0
> type <record_type 0x7ffff4ee2c78 simplify_plus_minus_op_data
> sizes-gimplified asm_written type_0 BLK
>
> For scalar types, the code that creates the copy is working correctly:
>
> /* Create a new temp variable of type TYPE. Add GIMPLE_ASSIGN to assign EXP
> to the new variable. */
>
> static gimple
> ifc_temp_var (tree type, tree exp)
> {
> const char *name = "_ifc_";
> tree var, new_name;
> gimple stmt;
>
> /* Create new temporary variable. */
> var = create_tmp_var (type, name);
> add_referenced_var (var);
>
> /* Build new statement to assign EXP to new variable. */
> stmt = gimple_build_assign (var, exp);
>
> /* Get SSA name for the new variable and set make new statement
> its definition statement. */
> new_name = make_ssa_name (var, stmt);
> gimple_assign_set_lhs (stmt, new_name);
> SSA_NAME_DEF_STMT (new_name) = stmt;
> update_stmt (stmt);
>
> return stmt;
> }
>
> What is missing in this function to make it handle non scalar types?
>
At least this is missing (but it is not enough, so I am still looking for
a solution):
if (gimple_referenced_vars (cfun))
{
add_referenced_var (t);
mark_sym_for_renaming (t);
}
from tree-dfa.c:
/* Build a temporary. Make sure and register it to be renamed. */
tree
make_rename_temp (tree type, const char *prefix)
{
tree t = create_tmp_var (type, prefix);
if (TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE
|| TREE_CODE (TREE_TYPE (t)) == VECTOR_TYPE)
DECL_GIMPLE_REG_P (t) = 1;
if (gimple_referenced_vars (cfun))
{
add_referenced_var (t);
mark_sym_for_renaming (t);
}
return t;
}
I will replace the call to create_tmp_var with make_rename_temp.
Sebastian
