[PATCH] Remove TYPE_IS_SIZETYPE

[Eric Botcazou]

> For example
>
> Index: stor-layout.c
> ===================================================================
> --- stor-layout.c	(revision 187364)
> +++ stor-layout.c	(working copy)
> @@ -791,6 +791,10 @@ start_record_layout (tree t)
>  tree
>  bit_from_pos (tree offset, tree bitpos)
>  {
> +  if (TREE_CODE (offset) == PLUS_EXPR)
> +    offset = size_binop (PLUS_EXPR,
> +			 fold_convert (bitsizetype, TREE_OPERAND (offset, 0)),
> +			 fold_convert (bitsizetype, TREE_OPERAND (offset, 1)));
>    return size_binop (PLUS_EXPR, bitpos,
>  		     size_binop (MULT_EXPR,
>  				 fold_convert (bitsizetype, offset),
>
> fixes the specific testcase you provided.

I get a bootstrap failure on x86 (verify_flow_info failed) with it.  Let's drop 
it for now, we'll revisit this later.

> I suppose if stor-layout.c would 
> be more carefully handle advancing offset/bitpos, avoding repeated
> translations between them, those issues would not exist.  Of course the
> mere existence of DECL_OFFSET_ALIGN complicates matters for no good reasons
> (well, at least I did not find a good use of it until now ...).

Maybe it's also obsolete by now.

-- 
Eric Botcazou