[gcc r13-1840] Handle non constant ranges in irange pretty printer.

[Aldy Hernandez <aldyh@gcc.gnu.org>]

https://gcc.gnu.org/g:2615502971ca11c15f1949c03d93ccfe1ce54f55

commit r13-1840-g2615502971ca11c15f1949c03d93ccfe1ce54f55
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Tue Jul 26 11:03:17 2022 +0200

    Handle non constant ranges in irange pretty printer.
    
    Technically iranges only exist in constant form, but we allow symbolic
    ones before arriving in the ranger, so legacy VRP can work.  This fixes the
    ICE when attempting to print symbolic iranges in the pretty printer.
    
    For consistency's sake, I have made sure irange::get_nonzero_bits does
    not similarly ICE on a symbolic range, even though no one should be
    querying nonzero bits on such a range.  This should all melt away
    when legacy disappears, because all these methods are slated for
    removal (min, max, kind, symbolic_p, constant_p, etc).
    
    Finally, Richi suggested using pp_wide_int in the pretty printer
    instead of going through trees.  I've adapted a test, since
    dump_generic_node seems to work slightly different.
    
            PR tree-optimization/106444
    
    gcc/ChangeLog:
    
            * value-range-pretty-print.cc (vrange_printer::visit): Handle
            legacy ranges.
            (vrange_printer::print_irange_bound): Work on wide_int's.
            * value-range-pretty-print.h (print_irange_bound): Same.
            * value-range.cc (irange::get_nonzero_bits): Handle legacy ranges.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/tree-ssa/evrp4.c: Adjust.

Diff:
---
 gcc/testsuite/gcc.dg/tree-ssa/evrp4.c |  2 +-
 gcc/value-range-pretty-print.cc       | 33 ++++++++++++++++++++-------------
 gcc/value-range-pretty-print.h        |  2 +-
 gcc/value-range.cc                    |  8 ++++++++
 4 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/evrp4.c b/gcc/testsuite/gcc.dg/tree-ssa/evrp4.c
index e3f4531b16c..895109fdadd 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/evrp4.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/evrp4.c
@@ -17,4 +17,4 @@ int bar (struct st *s)
   foo (&s->a);
 }
 
-/* { dg-final { scan-tree-dump "\\\[1B, \\+INF\\\]" "evrp" } } */
+/* { dg-final { scan-tree-dump "\\\[1, \\+INF\\\]" "evrp" } } */
diff --git a/gcc/value-range-pretty-print.cc b/gcc/value-range-pretty-print.cc
index 485612fe67c..cbf50d3d854 100644
--- a/gcc/value-range-pretty-print.cc
+++ b/gcc/value-range-pretty-print.cc
@@ -63,38 +63,45 @@ vrange_printer::visit (const irange &r) const
       pp_string (pp, "VARYING");
       return;
     }
- for (unsigned i = 0; i < r.num_pairs (); ++i)
+  // Handle legacy symbolics.
+  if (!r.constant_p ())
     {
-      tree lb = wide_int_to_tree (r.type (), r.lower_bound (i));
-      tree ub = wide_int_to_tree (r.type (), r.upper_bound (i));
+      if (r.kind () == VR_ANTI_RANGE)
+	pp_character (pp, '~');
       pp_character (pp, '[');
-      print_irange_bound (lb);
+      dump_generic_node (pp, r.min (), 0, TDF_NONE, false);
       pp_string (pp, ", ");
-      print_irange_bound (ub);
+      dump_generic_node (pp, r.max (), 0, TDF_NONE, false);
+      pp_character (pp, ']');
+      print_irange_bitmasks (r);
+      return;
+    }
+  for (unsigned i = 0; i < r.num_pairs (); ++i)
+    {
+      pp_character (pp, '[');
+      print_irange_bound (r.lower_bound (i), r.type ());
+      pp_string (pp, ", ");
+      print_irange_bound (r.upper_bound (i), r.type ());
       pp_character (pp, ']');
     }
  print_irange_bitmasks (r);
 }
 
 void
-vrange_printer::print_irange_bound (tree bound) const
+vrange_printer::print_irange_bound (const wide_int &bound, tree type) const
 {
-  tree type = TREE_TYPE (bound);
   wide_int type_min = wi::min_value (TYPE_PRECISION (type), TYPE_SIGN (type));
   wide_int type_max = wi::max_value (TYPE_PRECISION (type), TYPE_SIGN (type));
 
   if (INTEGRAL_TYPE_P (type)
       && !TYPE_UNSIGNED (type)
-      && TREE_CODE (bound) == INTEGER_CST
-      && wi::to_wide (bound) == type_min
+      && bound == type_min
       && TYPE_PRECISION (type) != 1)
     pp_string (pp, "-INF");
-  else if (TREE_CODE (bound) == INTEGER_CST
-	   && wi::to_wide (bound) == type_max
-	   && TYPE_PRECISION (type) != 1)
+  else if (bound == type_max && TYPE_PRECISION (type) != 1)
     pp_string (pp, "+INF");
   else
-    dump_generic_node (pp, bound, 0, TDF_NONE, false);
+    pp_wide_int (pp, bound, TYPE_SIGN (type));
 }
 
 void
diff --git a/gcc/value-range-pretty-print.h b/gcc/value-range-pretty-print.h
index c1c7c4244cc..ad06c93c044 100644
--- a/gcc/value-range-pretty-print.h
+++ b/gcc/value-range-pretty-print.h
@@ -29,7 +29,7 @@ public:
   void visit (const irange &) const override;
   void visit (const frange &) const override;
 private:
-  void print_irange_bound (tree bound) const;
+  void print_irange_bound (const wide_int &w, tree type) const;
   void print_irange_bitmasks (const irange &) const;
   void print_frange_prop (const char *str, const fp_prop &) const;
 
diff --git a/gcc/value-range.cc b/gcc/value-range.cc
index e49b06d1038..2923f4f5a0e 100644
--- a/gcc/value-range.cc
+++ b/gcc/value-range.cc
@@ -2593,6 +2593,14 @@ irange::get_nonzero_bits () const
 {
   gcc_checking_assert (!undefined_p ());
 
+  // In case anyone in the legacy world queries us.
+  if (!constant_p ())
+    {
+      if (m_nonzero_mask)
+	return wi::to_wide (m_nonzero_mask);
+      return wi::shwi (-1, TYPE_PRECISION (type ()));
+    }
+
   // Calculate the nonzero bits inherent in the range.
   wide_int min = lower_bound ();
   wide_int max = upper_bound ();