predicate for getting declaration tree node for SUBREG

[Richard Guenther]

On Mon, Sep 24, 2012 at 3:01 PM, srinivas dama <srinivas.ind@gmail.com> wrote:
> Hi,
>
> I see there is predicate REG_EXPR for getting declaration node for a REG rtx.
> It would be helpful If I get an equivalent predicate for a  SUBREG rtx.
> I couldn't find such thing.
>
> My requirement is :
>
> I need find out if an operand is signed/unsigned from rtx.I am doing as below.
>  rtx op0;
>  tree decl0;
>  decl0 = REG_EXPR (op0);
>  unsignedp =TYPE_UNSIGNED (TREE_TYPE (decl0)):
>
>
> But if my rtx is SUBREG ,I couldn't find equivalent predicate similar
> to REG_EXPR.

There isn't one.  Similar to how REG_EXPR can be NULL.  In that case
you simply don't know.

Richard.

>
>
> Regards,
> srinivas