--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/range.cc	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,64 @@
+/* Misc range functions.
+   Copyright (C) 2017-2020 Free Software Foundation, Inc.
+   Contributed by Aldy Hernandez <aldyh@redhat.com>.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "backend.h"
+#include "tree.h"
+#include "gimple.h"
+#include "gimple-pretty-print.h"
+#include "fold-const.h"
+#include "ssa.h"
+#include "range.h"
+
+value_range
+range_zero (tree type)
+{
+  return value_range (build_zero_cst (type), build_zero_cst (type));
+}
+
+value_range
+range_nonzero (tree type)
+{
+  return value_range (build_zero_cst (type), build_zero_cst (type),
+		      VR_ANTI_RANGE);
+}
+
+value_range
+range_positives (tree type)
+{
+  unsigned prec = TYPE_PRECISION (type);
+  signop sign = TYPE_SIGN (type);
+  return value_range (type, wi::zero (prec), wi::max_value (prec, sign));
+}
+
+value_range
+range_negatives (tree type)
+{
+  unsigned prec = TYPE_PRECISION (type);
+  signop sign = TYPE_SIGN (type);
+  value_range r;
+  if (sign == UNSIGNED)
+    r.set_undefined ();
+  else
+    r = value_range (type, wi::min_value (prec, sign), wi::minus_one (prec));
+  return r;
+}