2 files changed, 16 insertions, 1 deletions
diff --git a/gcc/value-range.cc b/gcc/value-range.cc
index 93c44a68365..45b1e655967 100644
--- a/gcc/value-range.cc
+++ b/gcc/value-range.cc
@@ -203,7 +203,10 @@ vrange::operator= (const vrange &src)
   else if (is_a <frange> (src))
     as_a <frange> (*this) = as_a <frange> (src);
   else
-    gcc_unreachable ();
+    {
+      gcc_checking_assert (is_a <unsupported_range> (src));
+      m_kind = src.m_kind;
+    }
   return *this;
 }
 
diff --git a/gcc/value-range.h b/gcc/value-range.h
index 0da2a42764a..ab982d18402 100644
--- a/gcc/value-range.h
+++ b/gcc/value-range.h
@@ -460,6 +460,13 @@ is_a <frange> (vrange &v)
   return v.m_discriminator == VR_FRANGE;
 }
 
+template <>
+inline bool
+is_a <unsupported_range> (vrange &v)
+{
+  return v.m_discriminator == VR_UNKNOWN;
+}
+
 // For resizable ranges, resize the range up to HARD_MAX_RANGES if the
 // NEEDED pairs is greater than the current capacity of the range.
 
@@ -624,6 +631,11 @@ Value_Range::operator= (const vrange &r)
       m_frange = as_a <frange> (r);
       m_vrange = &m_frange;
     }
+  else if (is_a <unsupported_range> (r))
+    {
+      m_unsupported = as_a <unsupported_range> (r);
+      m_vrange = &m_unsupported;
+    }
   else
     gcc_unreachable ();