[gcc r13-1815] Minor fixes to vr_values to not die on non integral types.

[gcc r13-1815] Minor fixes to vr_values to not die on non integral types.

[Aldy Hernandez]

https://gcc.gnu.org/g:8b8103dcd2624936bd1f56ac2ee63d1fb779a7e4

commit r13-1815-g8b8103dcd2624936bd1f56ac2ee63d1fb779a7e4
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Sun Jul 24 07:55:02 2022 +0200

    Minor fixes to vr_values to not die on non integral types.
    
    The legacy code in vr_values mostly works on integral types (with few
    exceptions such as some conversions from float).  This patch makes
    vr_values::range_of_expr not die when asked for a range of an
    unsupported type.  It also keeps the min/max simplification code from
    being called on non integrals, similarly to what many of the other
    assignment code is doing.
    
    This is all a nop on the current code, but will keep us from
    misbehaving when VRP starts working on non-integrals.
    
    Tested on x86-64 Linux.
    
    gcc/ChangeLog:
    
            * value-query.cc (range_query::get_value_range): Add assert.
            * vr-values.cc (vr_values::range_of_expr): Make sure we don't ICE
            on unsupported types in vr_values.
            (simplify_using_ranges::simplify): Same.

Diff:
---
 gcc/value-query.cc |  1 +
 gcc/vr-values.cc   | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/gcc/value-query.cc b/gcc/value-query.cc
index 3560d19f1ae..decf5aae1fe 100644
--- a/gcc/value-query.cc
+++ b/gcc/value-query.cc
@@ -167,6 +167,7 @@ range_query::free_value_range_equiv (value_range_equiv *v)
 const class value_range_equiv *
 range_query::get_value_range (const_tree expr, gimple *stmt)
 {
+  gcc_checking_assert (value_range_equiv::supports_p (TREE_TYPE (expr)));
   int_range_max r;
   if (range_of_expr (r, const_cast<tree> (expr), stmt))
     return new (equiv_alloc->allocate ()) value_range_equiv (r);
diff --git a/gcc/vr-values.cc b/gcc/vr-values.cc
index 6b9c630fed3..626a9189472 100644
--- a/gcc/vr-values.cc
+++ b/gcc/vr-values.cc
@@ -188,6 +188,17 @@ vr_values::range_of_expr (vrange &r, tree expr, gimple *stmt)
 	r = *vr;
       else
 	{
+	  if (!vr->supports_type_p (TREE_TYPE (expr)))
+	    {
+	      // vr_values::extract_range_basic() use of ranger's
+	      // fold_range() can create a situation where we are
+	      // asked for the range of an unsupported legacy type.
+	      // Since get_value_range() above will return varying for
+	      // such types, avoid copying incompatible range types.
+	      gcc_checking_assert (vr->varying_p ());
+	      r.set_varying (TREE_TYPE (expr));
+	      return true;
+	    }
 	  value_range tmp = *vr;
 	  tmp.normalize_symbolics ();
 	  r = tmp;
@@ -4375,7 +4386,9 @@ simplify_using_ranges::simplify (gimple_stmt_iterator *gsi)
 
 	case MIN_EXPR:
 	case MAX_EXPR:
-	  return simplify_min_or_max_using_ranges (gsi, stmt);
+	  if (INTEGRAL_TYPE_P (TREE_TYPE (rhs1)))
+	    return simplify_min_or_max_using_ranges (gsi, stmt);
+	  break;
 
 	case RSHIFT_EXPR:
 	  {