Re: [COMMITTED] Implement vrange::supports_type_p.

[Richard Biener <richard.guenther@gmail.com>]

On Mon, Jun 27, 2022 at 9:00 PM Aldy Hernandez <aldyh@redhat.com> wrote:
>
> The conversion for loop-ch is trivial, since the range of a
> GIMPLE_COND is always an integer.

Yes - but doesn't this hint at the fact that the irange::supports_p is
useless because it checks on the type of the comparison operand
rather than the type of the comparison (boolean_type_node)?

So .. instead of replacing it, remove it?

Richard.

> OK for trunk?
>
> p.s. The loop unswitch code requires a bit more thought, since there
> are numerous range temporaries in the code that are not necessarily
> integers.
>
> On Mon, Jun 13, 2022 at 11:44 AM Richard Biener
> <richard.guenther@gmail.com> wrote:
> >
> > On Fri, Jun 3, 2022 at 9:31 AM Aldy Hernandez <aldyh@redhat.com> wrote:
> > >
> > > [I have conservatively assumed that both the loop-ch and loop-unswitch
> > > passes, which also use the ranger, only support integers and pointers.
> > > If the goal is to handle other types as well, irange::supports_p()
> > > should be Value_Range::supports_type_p(), and any uses of
> > > int_range_max should be converted to Value_Range.  I can help in the
> > > conversion if you'd like.]
> >
> > Both should also support float ranges, so yes - if you can send simple
> > patches I'll review them.
> >
> > > As discussed, this patch disambiguates the use of supports_type_p
> > > throughout, as what ranger supports is a totally different question
> > > than what a given range variant (irange, frange, etc) supports.
> > >
> > > Unfortunately we need both a static method and a virtual method, and
> > > they can't be named the same.  The uses are documented in the vrange
> > > class:
> > >
> > > +// To query what types ranger and the entire ecosystem can support,
> > > +// use Value_Range::supports_type_p(tree type).  This is a static
> > > +// method available independently of any vrange object.
> > > +//
> > > +// To query what a given vrange variant can support, use:
> > > +//    irange::supports_p ()
> > > +//    frange::supports_p ()
> > > +//    etc
> > > +//
> > > +// To query what a range object can support, use:
> > > +//    void foo (vrange &v, irange &i, frange &f)
> > > +//    {
> > > +//     if (v.supports_type_p (type)) ...
> > > +//     if (i.supports_type_p (type)) ...
> > > +//     if (f.supports_type_p (type)) ...
> > > +//    }
> > >
> > > The value_range_equiv::supports_p() method can be use to determine
> > > what legacy VRP supports, as irange::supports_p() will no longer be
> > > applicable in the evrp analyzer code base once irange and prange are
> > > split.
> > >
> > > Tested on x86-64 Linux.
> > >
> > > gcc/ChangeLog:
> > >
> > >         * gimple-range-edge.cc (gimple_outgoing_range_stmt_p): Adjust for
> > >         an object level supports_type_p for irange and a static
> > >         Value_Range::supports_type_p.
> > >         * gimple-range-fold.cc (fold_using_range::range_of_range_op): Same.
> > >         (fold_using_range::range_of_address): Same.
> > >         (fold_using_range::range_of_builtin_call): Same.
> > >         * gimple-range-fold.h (gimple_range_type): Same.
> > >         (gimple_range_ssa_p): Same.
> > >         * gimple-range-path.cc (path_range_query::internal_range_of_expr):
> > >         Same.
> > >         (path_range_query::range_of_stmt): Same.
> > >         (path_range_query::add_to_imports): Same.
> > >         * gimple-range.cc (gimple_ranger::range_on_edge): Same.
> > >         (gimple_ranger::export_global_ranges): Same.
> > >         * gimple-ssa-evrp-analyze.cc
> > >         (evrp_range_analyzer::record_ranges_from_phis):  Same.
> > >         * range-op.cc (range_operator::wi_fold): Same.
> > >         (range_operator::fold_range): Same.
> > >         * tree-ssa-loop-ch.cc (entry_loop_condition_is_static): Same.
> > >         * tree-ssa-loop-unswitch.cc (struct unswitch_predicate): Same.
> > >         (evaluate_control_stmt_using_entry_checks): Same.
> > >         * tree-ssa-threadedge.cc
> > >         (hybrid_jt_simplifier::compute_ranges_from_state): Same.
> > >         * tree-vrp.cc (supported_types_p): Same.
> > >         * value-query.cc (range_query::value_of_expr): Same.
> > >         (range_query::value_on_edge): Same.
> > >         (range_query::value_of_stmt): Same.
> > >         (range_query::get_tree_range): Same.
> > >         (get_range_global): Same.
> > >         (global_range_query::range_of_expr): Same.
> > >         * value-range-equiv.h (class value_range_equiv): Same.
> > >         * value-range.cc (irange::supports_type_p): Same.
> > >         (unsupported_range::supports_type_p): Same.
> > >         * value-range.h (enum value_range_discriminator): Same.
> > >         (Value_Range::init): Same.
> > >         (Value_Range::supports_type_p): Same.
> > >         (irange::supports_type_p): Same.
> > >         (irange::supports_p): Same.
> > >         (vrange::supports_type_p): Same.
> > >         (vrange_allocator::alloc_vrange): Same.
> > > ---
> > >  gcc/gimple-range-edge.cc       |  3 +--
> > >  gcc/gimple-range-fold.cc       |  5 ++--
> > >  gcc/gimple-range-fold.h        |  4 +--
> > >  gcc/gimple-range-path.cc       |  6 ++---
> > >  gcc/gimple-range.cc            |  4 +--
> > >  gcc/gimple-ssa-evrp-analyze.cc |  2 +-
> > >  gcc/range-op.cc                |  4 +--
> > >  gcc/tree-ssa-loop-ch.cc        |  2 +-
> > >  gcc/tree-ssa-loop-unswitch.cc  |  6 ++---
> > >  gcc/tree-ssa-threadedge.cc     |  2 +-
> > >  gcc/tree-vrp.cc                |  4 +--
> > >  gcc/value-query.cc             | 16 ++++++------
> > >  gcc/value-range-equiv.h        |  4 +++
> > >  gcc/value-range.cc             | 12 +++++++++
> > >  gcc/value-range.h              | 45 +++++++++++++++++++++++++---------
> > >  15 files changed, 76 insertions(+), 43 deletions(-)
> > >
> > > diff --git a/gcc/gimple-range-edge.cc b/gcc/gimple-range-edge.cc
> > > index 6fe33408f7e..03a804ac2be 100644
> > > --- a/gcc/gimple-range-edge.cc
> > > +++ b/gcc/gimple-range-edge.cc
> > > @@ -44,8 +44,7 @@ gimple_outgoing_range_stmt_p (basic_block bb)
> > >        gimple *s = gsi_stmt (gsi);
> > >        if (is_a<gcond *> (s) && range_op_handler (s))
> > >         return gsi_stmt (gsi);
> > > -      gswitch *sw = dyn_cast<gswitch *> (s);
> > > -      if (sw && irange::supports_type_p (TREE_TYPE (gimple_switch_index (sw))))
> > > +      if (is_a <gswitch *> (s))
> > >         return gsi_stmt (gsi);
> > >      }
> > >    return NULL;
> > > diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc
> > > index c1a801668c4..2a8c66e0c05 100644
> > > --- a/gcc/gimple-range-fold.cc
> > > +++ b/gcc/gimple-range-fold.cc
> > > @@ -632,7 +632,7 @@ fold_using_range::range_of_range_op (vrange &r, gimple *s, fur_source &src)
> > >             }
> > >           // Fold range, and register any dependency if available.
> > >           handler.fold_range (r, type, range1, range2, rel);
> > > -         if (irange::supports_type_p (type))
> > > +         if (irange::supports_p (type))
> > >             relation_fold_and_or (as_a <irange> (r), s, src);
> > >           if (lhs)
> > >             {
> > > @@ -709,7 +709,6 @@ fold_using_range::range_of_address (irange &r, gimple *stmt, fur_source &src)
> > >        tree lhs = gimple_get_lhs (stmt);
> > >        if (lhs && gimple_range_ssa_p (ssa) && src.gori ())
> > >         src.gori ()->register_dependency (lhs, ssa);
> > > -      gcc_checking_assert (irange::supports_type_p (TREE_TYPE (ssa)));
> > >        src.get_operand (r, ssa);
> > >        range_cast (r, TREE_TYPE (gimple_assign_rhs1 (stmt)));
> > >
> > > @@ -985,7 +984,7 @@ fold_using_range::range_of_builtin_call (vrange &r, gcall *call,
> > >    tree type = gimple_range_type (call);
> > >    gcc_checking_assert (type);
> > >
> > > -  if (irange::supports_type_p (type))
> > > +  if (irange::supports_p (type))
> > >      return range_of_builtin_int_call (as_a <irange> (r), call, src);
> > >
> > >    return false;
> > > diff --git a/gcc/gimple-range-fold.h b/gcc/gimple-range-fold.h
> > > index df24280ee40..fbf66275f74 100644
> > > --- a/gcc/gimple-range-fold.h
> > > +++ b/gcc/gimple-range-fold.h
> > > @@ -66,7 +66,7 @@ gimple_range_type (const gimple *s)
> > >             type = TREE_TYPE (type);
> > >         }
> > >      }
> > > -  if (type && vrange::supports_type_p (type))
> > > +  if (type && Value_Range::supports_type_p (type))
> > >      return type;
> > >    return NULL_TREE;
> > >  }
> > > @@ -79,7 +79,7 @@ gimple_range_ssa_p (tree exp)
> > >    if (exp && TREE_CODE (exp) == SSA_NAME &&
> > >        !SSA_NAME_IS_VIRTUAL_OPERAND (exp) &&
> > >        !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (exp) &&
> > > -      vrange::supports_type_p (TREE_TYPE (exp)))
> > > +      Value_Range::supports_type_p (TREE_TYPE (exp)))
> > >      return exp;
> > >    return NULL_TREE;
> > >  }
> > > diff --git a/gcc/gimple-range-path.cc b/gcc/gimple-range-path.cc
> > > index f8ae6fb9ffb..e1b9683c1e4 100644
> > > --- a/gcc/gimple-range-path.cc
> > > +++ b/gcc/gimple-range-path.cc
> > > @@ -192,7 +192,7 @@ path_range_query::range_on_path_entry (vrange &r, tree name)
> > >  bool
> > >  path_range_query::internal_range_of_expr (vrange &r, tree name, gimple *stmt)
> > >  {
> > > -  if (!vrange::supports_type_p (TREE_TYPE (name)))
> > > +  if (!r.supports_type_p (TREE_TYPE (name)))
> > >      return false;
> > >
> > >    if (get_cache (r, name))
> > > @@ -548,7 +548,7 @@ bool
> > >  path_range_query::add_to_imports (tree name, bitmap imports)
> > >  {
> > >    if (TREE_CODE (name) == SSA_NAME
> > > -      && vrange::supports_type_p (TREE_TYPE (name)))
> > > +      && Value_Range::supports_type_p (TREE_TYPE (name)))
> > >      return bitmap_set_bit (imports, SSA_NAME_VERSION (name));
> > >    return false;
> > >  }
> > > @@ -764,7 +764,7 @@ path_range_query::range_of_stmt (vrange &r, gimple *stmt, tree)
> > >  {
> > >    tree type = gimple_range_type (stmt);
> > >
> > > -  if (!type || !vrange::supports_type_p (type))
> > > +  if (!type || !r.supports_type_p (type))
> > >      return false;
> > >
> > >    // If resolving unknowns, fold the statement making use of any
> > > diff --git a/gcc/gimple-range.cc b/gcc/gimple-range.cc
> > > index 12da16841c2..67dafb2a2c0 100644
> > > --- a/gcc/gimple-range.cc
> > > +++ b/gcc/gimple-range.cc
> > > @@ -201,7 +201,7 @@ bool
> > >  gimple_ranger::range_on_edge (vrange &r, edge e, tree name)
> > >  {
> > >    Value_Range edge_range (TREE_TYPE (name));
> > > -  gcc_checking_assert (vrange::supports_type_p (TREE_TYPE (name)));
> > > +  gcc_checking_assert (r.supports_type_p (TREE_TYPE (name)));
> > >
> > >    // Do not process values along abnormal edges.
> > >    if (e->flags & EDGE_ABNORMAL)
> > > @@ -514,7 +514,7 @@ gimple_ranger::export_global_ranges ()
> > >               print_header = false;
> > >             }
> > >
> > > -         if (!irange::supports_type_p (TREE_TYPE (name)))
> > > +         if (!irange::supports_p (TREE_TYPE (name)))
> > >             continue;
> > >
> > >           vrange &v = r;
> > > diff --git a/gcc/gimple-ssa-evrp-analyze.cc b/gcc/gimple-ssa-evrp-analyze.cc
> > > index 16e5a75b1db..82142db7976 100644
> > > --- a/gcc/gimple-ssa-evrp-analyze.cc
> > > +++ b/gcc/gimple-ssa-evrp-analyze.cc
> > > @@ -255,7 +255,7 @@ evrp_range_analyzer::record_ranges_from_phis (basic_block bb)
> > >
> > >        /* Skips floats and other things we can't represent in a
> > >          range.  */
> > > -      if (!value_range::supports_type_p (TREE_TYPE (lhs)))
> > > +      if (!value_range_equiv::supports_p (TREE_TYPE (lhs)))
> > >         continue;
> > >
> > >        value_range_equiv vr_result;
> > > diff --git a/gcc/range-op.cc b/gcc/range-op.cc
> > > index 028b4b7237c..5150c6021b8 100644
> > > --- a/gcc/range-op.cc
> > > +++ b/gcc/range-op.cc
> > > @@ -111,7 +111,7 @@ range_operator::wi_fold (irange &r, tree type,
> > >                          const wide_int &rh_lb ATTRIBUTE_UNUSED,
> > >                          const wide_int &rh_ub ATTRIBUTE_UNUSED) const
> > >  {
> > > -  gcc_checking_assert (irange::supports_type_p (type));
> > > +  gcc_checking_assert (r.supports_type_p (type));
> > >    r.set_varying (type);
> > >  }
> > >
> > > @@ -181,7 +181,7 @@ range_operator::fold_range (irange &r, tree type,
> > >                             const irange &rh,
> > >                             relation_kind rel) const
> > >  {
> > > -  gcc_checking_assert (irange::supports_type_p (type));
> > > +  gcc_checking_assert (r.supports_type_p (type));
> > >    if (empty_range_varying (r, type, lh, rh))
> > >      return true;
> > >
> > > diff --git a/gcc/tree-ssa-loop-ch.cc b/gcc/tree-ssa-loop-ch.cc
> > > index 2f5a390404c..26d96c0c21a 100644
> > > --- a/gcc/tree-ssa-loop-ch.cc
> > > +++ b/gcc/tree-ssa-loop-ch.cc
> > > @@ -55,7 +55,7 @@ entry_loop_condition_is_static (class loop *l, path_range_query *query)
> > >    gcond *last = safe_dyn_cast <gcond *> (last_stmt (e->dest));
> > >
> > >    if (!last
> > > -      || !irange::supports_type_p (TREE_TYPE (gimple_cond_lhs (last))))
> > > +      || !irange::supports_p (TREE_TYPE (gimple_cond_lhs (last))))
> > >      return false;
> > >
> > >    edge true_e, false_e;
> > > diff --git a/gcc/tree-ssa-loop-unswitch.cc b/gcc/tree-ssa-loop-unswitch.cc
> > > index ad1d05ccdff..95ccc0b7b47 100644
> > > --- a/gcc/tree-ssa-loop-unswitch.cc
> > > +++ b/gcc/tree-ssa-loop-unswitch.cc
> > > @@ -113,7 +113,7 @@ struct unswitch_predicate
> > >        true_range (edge_range), edge_index (edge_index_), switch_p (true)
> > >    {
> > >      gcc_assert (!(e->flags & (EDGE_TRUE_VALUE|EDGE_FALSE_VALUE))
> > > -               && irange::supports_type_p (TREE_TYPE (lhs)));
> > > +               && irange::supports_p (TREE_TYPE (lhs)));
> > >      false_range = true_range;
> > >      if (!false_range.varying_p ()
> > >         && !false_range.undefined_p ())
> > > @@ -134,7 +134,7 @@ struct unswitch_predicate
> > >      tree rhs = gimple_cond_rhs (stmt);
> > >      enum tree_code code = gimple_cond_code (stmt);
> > >      condition = build2 (code, boolean_type_node, lhs, rhs);
> > > -    if (irange::supports_type_p (TREE_TYPE (lhs)))
> > > +    if (irange::supports_p (TREE_TYPE (lhs)))
> > >        {
> > >         auto range_op = range_op_handler (code, TREE_TYPE (lhs));
> > >         int_range<2> rhs_range (TREE_TYPE (rhs));
> > > @@ -646,7 +646,7 @@ evaluate_control_stmt_using_entry_checks (gimple *stmt,
> > >                               TREE_OPERAND (last_predicate->condition, 1)))
> > >         return true_edge ? boolean_true_node : boolean_false_node;
> > >        /* Else try ranger if it supports LHS.  */
> > > -      else if (irange::supports_type_p (TREE_TYPE (lhs)))
> > > +      else if (irange::supports_p (TREE_TYPE (lhs)))
> > >         {
> > >           int_range<2> r;
> > >           int_range_max path_range;
> > > diff --git a/gcc/tree-ssa-threadedge.cc b/gcc/tree-ssa-threadedge.cc
> > > index 931aa7479bb..a70aebd10a7 100644
> > > --- a/gcc/tree-ssa-threadedge.cc
> > > +++ b/gcc/tree-ssa-threadedge.cc
> > > @@ -1452,7 +1452,7 @@ hybrid_jt_simplifier::compute_ranges_from_state (gimple *stmt, jt_state *state)
> > >           tree op = gimple_op (stmt, i);
> > >           if (op
> > >               && TREE_CODE (op) == SSA_NAME
> > > -             && irange::supports_type_p (TREE_TYPE (op)))
> > > +             && Value_Range::supports_type_p (TREE_TYPE (op)))
> > >             bitmap_set_bit (imports, SSA_NAME_VERSION (op));
> > >         }
> > >      }
> > > diff --git a/gcc/tree-vrp.cc b/gcc/tree-vrp.cc
> > > index 74277617b66..30022dac108 100644
> > > --- a/gcc/tree-vrp.cc
> > > +++ b/gcc/tree-vrp.cc
> > > @@ -932,8 +932,8 @@ supported_types_p (value_range *vr,
> > >                    tree type0,
> > >                    tree type1 = NULL)
> > >  {
> > > -  if (!value_range::supports_type_p (type0)
> > > -      || (type1 && !value_range::supports_type_p (type1)))
> > > +  if (!value_range_equiv::supports_p (type0)
> > > +      || (type1 && !value_range_equiv::supports_p (type1)))
> > >      {
> > >        vr->set_varying (type0);
> > >        return false;
> > > diff --git a/gcc/value-query.cc b/gcc/value-query.cc
> > > index e40e358ebd4..1d7541ce34f 100644
> > > --- a/gcc/value-query.cc
> > > +++ b/gcc/value-query.cc
> > > @@ -80,7 +80,7 @@ range_query::value_of_expr (tree expr, gimple *stmt)
> > >  {
> > >    tree t;
> > >
> > > -  if (!vrange::supports_type_p (TREE_TYPE (expr)))
> > > +  if (!Value_Range::supports_type_p (TREE_TYPE (expr)))
> > >      return NULL_TREE;
> > >
> > >    Value_Range r (TREE_TYPE (expr));
> > > @@ -102,7 +102,7 @@ range_query::value_on_edge (edge e, tree expr)
> > >  {
> > >    tree t;
> > >
> > > -  if (!vrange::supports_type_p (TREE_TYPE (expr)))
> > > +  if (!Value_Range::supports_type_p (TREE_TYPE (expr)))
> > >      return NULL_TREE;
> > >    Value_Range r (TREE_TYPE (expr));
> > >    if (range_on_edge (r, e, expr))
> > > @@ -128,7 +128,7 @@ range_query::value_of_stmt (gimple *stmt, tree name)
> > >
> > >    gcc_checking_assert (!name || name == gimple_get_lhs (stmt));
> > >
> > > -  if (!name || !vrange::supports_type_p (TREE_TYPE (name)))
> > > +  if (!name || !Value_Range::supports_type_p (TREE_TYPE (name)))
> > >      return NULL_TREE;
> > >    Value_Range r (TREE_TYPE (name));
> > >    if (range_of_stmt (r, stmt, name) && r.singleton_p (&t))
> > > @@ -196,7 +196,7 @@ range_query::get_tree_range (vrange &r, tree expr, gimple *stmt)
> > >    else
> > >      type = TREE_TYPE (expr);
> > >
> > > -  if (!vrange::supports_type_p (type))
> > > +  if (!Value_Range::supports_type_p (type))
> > >      {
> > >        r.set_undefined ();
> > >        return false;
> > > @@ -252,7 +252,7 @@ range_query::get_tree_range (vrange &r, tree expr, gimple *stmt)
> > >      {
> > >        range_op_handler op (TREE_CODE (expr), type);
> > >        tree op0_type = TREE_TYPE (TREE_OPERAND (expr, 0));
> > > -      if (op && vrange::supports_type_p (op0_type))
> > > +      if (op && Value_Range::supports_type_p (op0_type))
> > >         {
> > >           Value_Range r0 (TREE_TYPE (TREE_OPERAND (expr, 0)));
> > >           Value_Range r1 (type);
> > > @@ -387,7 +387,7 @@ get_range_global (vrange &r, tree name)
> > >     }
> > >    else if (!POINTER_TYPE_P (type) && SSA_NAME_RANGE_INFO (name))
> > >      {
> > > -      gcc_checking_assert (irange::supports_type_p (TREE_TYPE (name)));
> > > +      gcc_checking_assert (irange::supports_p (TREE_TYPE (name)));
> > >        get_ssa_name_range_info (as_a <irange> (r), name);
> > >        if (r.undefined_p ())
> > >         r.set_varying (type);
> > > @@ -441,9 +441,7 @@ global_range_query global_ranges;
> > >  bool
> > >  global_range_query::range_of_expr (vrange &r, tree expr, gimple *stmt)
> > >  {
> > > -  tree type = TREE_TYPE (expr);
> > > -
> > > -  if (!irange::supports_type_p (type) || !gimple_range_ssa_p (expr))
> > > +  if (!gimple_range_ssa_p (expr))
> > >      return get_tree_range (r, expr, stmt);
> > >
> > >    get_range_global (r, expr);
> > > diff --git a/gcc/value-range-equiv.h b/gcc/value-range-equiv.h
> > > index 743ceb2b227..0a52d1372a1 100644
> > > --- a/gcc/value-range-equiv.h
> > > +++ b/gcc/value-range-equiv.h
> > > @@ -67,6 +67,10 @@ class GTY((user)) value_range_equiv : public value_range
> > >    void deep_copy (const value_range_equiv *);
> > >    void dump (FILE *) const;
> > >    void dump () const;
> > > +  static bool supports_p (tree type)
> > > +  {
> > > +    return INTEGRAL_TYPE_P (type) || POINTER_TYPE_P (type);
> > > +  }
> > >
> > >   private:
> > >    /* Deep-copies bitmap argument.  */
> > > diff --git a/gcc/value-range.cc b/gcc/value-range.cc
> > > index 429672737a8..c4bcb970094 100644
> > > --- a/gcc/value-range.cc
> > > +++ b/gcc/value-range.cc
> > > @@ -107,6 +107,12 @@ vrange::operator== (const vrange &src) const
> > >    gcc_unreachable ();
> > >  }
> > >
> > > +bool
> > > +irange::supports_type_p (tree type) const
> > > +{
> > > +  return supports_p (type);
> > > +}
> > > +
> > >  // Return TRUE if R fits in THIS.
> > >
> > >  bool
> > > @@ -140,6 +146,12 @@ unsupported_range::type () const
> > >    return nullptr;
> > >  }
> > >
> > > +bool
> > > +unsupported_range::supports_type_p (tree) const
> > > +{
> > > +  return false;
> > > +}
> > > +
> > >  void
> > >  unsupported_range::set_undefined ()
> > >  {
> > > diff --git a/gcc/value-range.h b/gcc/value-range.h
> > > index 5cd0e0ef76a..69cf6c304d6 100644
> > > --- a/gcc/value-range.h
> > > +++ b/gcc/value-range.h
> > > @@ -50,6 +50,23 @@ enum value_range_discriminator
> > >  };
> > >
> > >  // Abstract class for ranges of any of the supported types.
> > > +//
> > > +// To query what types ranger and the entire ecosystem can support,
> > > +// use Value_Range::supports_type_p(tree type).  This is a static
> > > +// method available independently of any vrange object.
> > > +//
> > > +// To query what a given vrange variant can support, use:
> > > +//    irange::supports_p ()
> > > +//    frange::supports_p ()
> > > +//    etc
> > > +//
> > > +// To query what a range object can support, use:
> > > +//    void foo (vrange &v, irange &i, frange &f)
> > > +//    {
> > > +//     if (v.supports_type_p (type)) ...
> > > +//     if (i.supports_type_p (type)) ...
> > > +//     if (f.supports_type_p (type)) ...
> > > +//    }
> > >
> > >  class vrange
> > >  {
> > > @@ -58,6 +75,7 @@ class vrange
> > >  public:
> > >    virtual void set (tree, tree, value_range_kind = VR_RANGE) = 0;
> > >    virtual tree type () const = 0;
> > > +  virtual bool supports_type_p (tree type) const = 0;
> > >    virtual void set_varying (tree type) = 0;
> > >    virtual void set_undefined () = 0;
> > >    virtual void dump (FILE * = stderr) const = 0;
> > > @@ -72,8 +90,6 @@ public:
> > >    virtual void set_nonnegative (tree type) = 0;
> > >    virtual bool fits_p (const vrange &r) const = 0;
> > >
> > > -  static bool supports_type_p (tree);
> > > -
> > >    bool varying_p () const;
> > >    bool undefined_p () const;
> > >    vrange& operator= (const vrange &);
> > > @@ -103,7 +119,8 @@ public:
> > >    virtual void set_undefined () override;
> > >
> > >    // Range types.
> > > -  static bool supports_type_p (tree);
> > > +  static bool supports_p (tree type);
> > > +  virtual bool supports_type_p (tree type) const override;
> > >    virtual tree type () const override;
> > >
> > >    // Iteration over sub-ranges.
> > > @@ -228,6 +245,7 @@ public:
> > >    unsupported_range ();
> > >    virtual void set (tree, tree, value_range_kind) override;
> > >    virtual tree type () const override;
> > > +  virtual bool supports_type_p (tree type) const override;
> > >    virtual void set_varying (tree type) override;
> > >    virtual void set_undefined () override;
> > >    virtual void dump (FILE *) const override;
> > > @@ -331,6 +349,7 @@ public:
> > >    operator vrange &();
> > >    operator const vrange &() const;
> > >    void dump (FILE *out = stderr) const;
> > > +  static bool supports_type_p (tree type);
> > >
> > >    // Convenience methods for vrange compatability.
> > >    void set (tree min, tree max, value_range_kind kind = VR_RANGE)
> > > @@ -387,7 +406,7 @@ Value_Range::init (tree type)
> > >  {
> > >    gcc_checking_assert (TYPE_P (type));
> > >
> > > -  if (irange::supports_type_p (type))
> > > +  if (irange::supports_p (type))
> > >      m_vrange = &m_irange;
> > >    else
> > >      m_vrange = &m_unsupported;
> > > @@ -444,6 +463,14 @@ Value_Range::operator const vrange &() const
> > >    return *m_vrange;
> > >  }
> > >
> > > +// Return TRUE if TYPE is supported by the vrange infrastructure.
> > > +
> > > +inline bool
> > > +Value_Range::supports_type_p (tree type)
> > > +{
> > > +  return irange::supports_p (type);
> > > +}
> > > +
> > >  // Returns true for an old-school value_range as described above.
> > >  inline bool
> > >  irange::legacy_mode_p () const
> > > @@ -580,7 +607,7 @@ irange::nonzero_p () const
> > >  }
> > >
> > >  inline bool
> > > -irange::supports_type_p (tree type)
> > > +irange::supports_p (tree type)
> > >  {
> > >    return INTEGRAL_TYPE_P (type) || POINTER_TYPE_P (type);
> > >  }
> > > @@ -864,12 +891,6 @@ irange::normalize_kind ()
> > >      }
> > >  }
> > >
> > > -inline bool
> > > -vrange::supports_type_p (tree type)
> > > -{
> > > -  return irange::supports_type_p (type);
> > > -}
> > > -
> > >  // Return the maximum value for TYPE.
> > >
> > >  inline tree
> > > @@ -944,7 +965,7 @@ vrange_allocator::alloc (unsigned bytes)
> > >  inline vrange *
> > >  vrange_allocator::alloc_vrange (tree type)
> > >  {
> > > -  if (irange::supports_type_p (type))
> > > +  if (irange::supports_p (type))
> > >      return alloc_irange (2);
> > >
> > >    gcc_unreachable ();
> > > --
> > > 2.36.1
> > >
> >