Re: [PATCH] wide-int: Remove rwide_int, introduce dw_wide_int

[Jakub Jelinek <jakub@redhat.com>]

On Tue, Oct 10, 2023 at 09:30:31AM +0000, Richard Biener wrote:
> On Mon, 9 Oct 2023, Jakub Jelinek wrote:
> 
> > On Mon, Oct 09, 2023 at 12:55:02PM +0200, Jakub Jelinek wrote:
> > > This makes wide_int unusable in GC structures, so for dwarf2out
> > > which was the only place which needed it there is a new rwide_int type
> > > (restricted wide_int) which supports only up to RWIDE_INT_MAX_ELTS limbs
> > > inline and is trivially copyable (dwarf2out should never deal with large
> > > _BitInt constants, those should have been lowered earlier).
> > 
> > As discussed on IRC, the dwarf2out.{h,cc} needs are actually quite limited,
> > it just needs to allocate new GC structures val_wide points to (constructed
> > from some const wide_int_ref &) and needs to call operator==,
> > get_precision, elt, get_len and get_val methods on it.
> > Even trailing_wide_int would be overkill for that, the following just adds
> > a new struct with precision/len and trailing val array members and
> > implements the needed methods (only 2 of them using wide_int_ref constructed
> > from those).
> > 
> > Incremental patch, so far compile time tested only:
> 
> LGTM, wonder if we can push this separately as prerequesite?

The dwarf2out.{h,cc} changes sure, the wide-int.h changes obviously need to
be merged into the main patch.

	Jakub