Unify MINUS_EXPR range operator

Move the declaration of the class to the range-op-mixed header, add the
floating point prototypes as well, and use it in the new unified table.

	* range-op-float.cc (foperator_minus): Remove.  Move prototypes
	to range-op-mixed.h
	(operator_minus::fold_range): Rename from foperator_minus.
	(operator_minus::op1_range): Ditto.
	(operator_minus::op2_range): Ditto.
	(operator_minus::rv_fold): Ditto.
	(float_table::float_table): Remove MINUS_EXPR.
	* range-op-mixed.h (class operator_minus): Combined from integer
	and float files.
	* range-op.cc (op_minus): New object.
	(unified_table::unified_table): Add MINUS_EXPR.
	(class operator_minus): Move to range-op-mixed.h.
	(integral_table::integral_table): Remove MINUS_EXPR.
	(pointer_table::pointer_table): Remove MINUS_EXPR.

3 files changed, 93 insertions, 81 deletions

diff --git a/gcc/range-op-float.cc b/gcc/range-op-float.cc
index 2b177c3..db76dd5 100644
--- a/gcc/range-op-float.cc
+++ b/gcc/range-op-float.cc
@@ -2286,56 +2286,52 @@ operator_plus::rv_fold (REAL_VALUE_TYPE &lb, REAL_VALUE_TYPE &ub,
 }
 
 
-class foperator_minus : public range_operator
+bool
+operator_minus::op1_range (frange &r, tree type,
+			   const frange &lhs, const frange &op2,
+			   relation_trio) const
 {
-  using range_operator::op1_range;
-  using range_operator::op2_range;
-public:
-  virtual bool op1_range (frange &r, tree type,
-			  const frange &lhs,
-			  const frange &op2,
-			  relation_trio = TRIO_VARYING) const final override
-  {
-    if (lhs.undefined_p ())
-      return false;
-    frange wlhs = float_widen_lhs_range (type, lhs);
-    return float_binary_op_range_finish (
-		range_op_handler (PLUS_EXPR).fold_range (r, type, wlhs, op2),
-		r, type, wlhs);
-  }
-  virtual bool op2_range (frange &r, tree type,
-			  const frange &lhs,
-			  const frange &op1,
-			  relation_trio = TRIO_VARYING) const final override
-  {
-    if (lhs.undefined_p ())
-      return false;
-    frange wlhs = float_widen_lhs_range (type, lhs);
-    return float_binary_op_range_finish (fold_range (r, type, op1, wlhs),
-					 r, type, wlhs);
-  }
-private:
-  void rv_fold (REAL_VALUE_TYPE &lb, REAL_VALUE_TYPE &ub, bool &maybe_nan,
-		tree type,
-		const REAL_VALUE_TYPE &lh_lb,
-		const REAL_VALUE_TYPE &lh_ub,
-		const REAL_VALUE_TYPE &rh_lb,
-		const REAL_VALUE_TYPE &rh_ub,
-		relation_kind) const final override
-  {
-    frange_arithmetic (MINUS_EXPR, type, lb, lh_lb, rh_ub, dconstninf);
-    frange_arithmetic (MINUS_EXPR, type, ub, lh_ub, rh_lb, dconstinf);
+  if (lhs.undefined_p ())
+    return false;
+  frange wlhs = float_widen_lhs_range (type, lhs);
+  return float_binary_op_range_finish (
+	      range_op_handler (PLUS_EXPR).fold_range (r, type, wlhs, op2),
+	      r, type, wlhs);
+}
 
-    // [+INF] - [+INF] = NAN
-    if (real_isinf (&lh_ub, false) && real_isinf (&rh_ub, false))
-      maybe_nan = true;
-    // [-INF] - [-INF] = NAN
-    else if (real_isinf (&lh_lb, true) && real_isinf (&rh_lb, true))
-      maybe_nan = true;
-    else
-      maybe_nan = false;
-  }
-} fop_minus;
+bool
+operator_minus::op2_range (frange &r, tree type,
+			   const frange &lhs, const frange &op1,
+			   relation_trio) const
+{
+  if (lhs.undefined_p ())
+    return false;
+  frange wlhs = float_widen_lhs_range (type, lhs);
+  return float_binary_op_range_finish (fold_range (r, type, op1, wlhs),
+				       r, type, wlhs);
+}
+
+void
+operator_minus::rv_fold (REAL_VALUE_TYPE &lb, REAL_VALUE_TYPE &ub,
+			 bool &maybe_nan, tree type,
+			 const REAL_VALUE_TYPE &lh_lb,
+			 const REAL_VALUE_TYPE &lh_ub,
+			 const REAL_VALUE_TYPE &rh_lb,
+			 const REAL_VALUE_TYPE &rh_ub,
+			 relation_kind) const
+{
+  frange_arithmetic (MINUS_EXPR, type, lb, lh_lb, rh_ub, dconstninf);
+  frange_arithmetic (MINUS_EXPR, type, ub, lh_ub, rh_lb, dconstinf);
+
+  // [+INF] - [+INF] = NAN
+  if (real_isinf (&lh_ub, false) && real_isinf (&rh_ub, false))
+    maybe_nan = true;
+  // [-INF] - [-INF] = NAN
+  else if (real_isinf (&lh_lb, true) && real_isinf (&rh_lb, true))
+    maybe_nan = true;
+  else
+    maybe_nan = false;
+}
 
 
 class foperator_mult_div_base : public range_operator
@@ -2679,7 +2675,6 @@ private:
 float_table::float_table ()
 {
   set (NEGATE_EXPR, fop_negate);
-  set (MINUS_EXPR, fop_minus);
   set (MULT_EXPR, fop_mult);
 }
 
diff --git a/gcc/range-op-mixed.h b/gcc/range-op-mixed.h
index a942808..520ec19 100644
--- a/gcc/range-op-mixed.h
+++ b/gcc/range-op-mixed.h
@@ -388,4 +388,46 @@ private:
 		const wide_int &rh_ub) const final override;
 
 };
+
+class operator_minus : public range_operator
+{
+public:
+  using range_operator::fold_range;
+  using range_operator::op1_range;
+  using range_operator::op2_range;
+  using range_operator::lhs_op1_relation;
+  bool op1_range (irange &r, tree type,
+		  const irange &lhs, const irange &op2,
+		  relation_trio) const final override;
+  bool op1_range (frange &r, tree type,
+		  const frange &lhs, const frange &op2,
+		  relation_trio = TRIO_VARYING) const final override;
+
+  bool op2_range (irange &r, tree type,
+		  const irange &lhs, const irange &op1,
+		  relation_trio) const final override;
+  bool op2_range (frange &r, tree type,
+		  const frange &lhs,
+		  const frange &op1,
+		  relation_trio = TRIO_VARYING) const final override;
+
+  relation_kind lhs_op1_relation (const irange &lhs,
+				  const irange &op1, const irange &op2,
+				  relation_kind rel) const final override;
+  bool op1_op2_relation_effect (irange &lhs_range, tree type,
+				const irange &op1_range,
+				const irange &op2_range,
+				relation_kind rel) const final override;
+  void update_bitmask (irange &r, const irange &lh,
+		       const irange &rh) const final override;
+private:
+  void wi_fold (irange &r, tree type, const wide_int &lh_lb,
+		const wide_int &lh_ub, const wide_int &rh_lb,
+		const wide_int &rh_ub) const final override;
+  void rv_fold (REAL_VALUE_TYPE &lb, REAL_VALUE_TYPE &ub,
+		bool &maybe_nan, tree type,
+		const REAL_VALUE_TYPE &lh_lb, const REAL_VALUE_TYPE &lh_ub,
+		const REAL_VALUE_TYPE &rh_lb, const REAL_VALUE_TYPE &rh_ub,
+		relation_kind) const final override;
+};
 #endif // GCC_RANGE_OP_MIXED_H
diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index b4cdaf5..2094479 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -73,6 +73,7 @@ operator_cst op_cst;
 operator_cast op_cast;
 operator_plus op_plus;
 operator_abs op_abs;
+operator_minus op_minus;
 
 // Invoke the initialization routines for each class of range.
 
@@ -97,6 +98,7 @@ unified_table::unified_table ()
   set (CONVERT_EXPR, op_cast);
   set (PLUS_EXPR, op_plus);
   set (ABS_EXPR, op_abs);
+  set (MINUS_EXPR, op_minus);
 }
 
 // The tables are hidden and accessed via a simple extern function.
@@ -1787,38 +1789,12 @@ operator_widen_plus_unsigned::wi_fold (irange &r, tree type,
    r = int_range<2> (type, new_lb, new_ub);
 }
 
-class operator_minus : public range_operator
+void
+operator_minus::update_bitmask (irange &r, const irange &lh,
+				const irange &rh) const
 {
-  using range_operator::fold_range;
-  using range_operator::op1_range;
-  using range_operator::op2_range;
-  using range_operator::lhs_op1_relation;
-public:
-  virtual bool op1_range (irange &r, tree type,
-			  const irange &lhs,
-			  const irange &op2,
-			  relation_trio) const;
-  virtual bool op2_range (irange &r, tree type,
-			  const irange &lhs,
-			  const irange &op1,
-			  relation_trio) const;
-  virtual void wi_fold (irange &r, tree type,
-		        const wide_int &lh_lb,
-		        const wide_int &lh_ub,
-		        const wide_int &rh_lb,
-		        const wide_int &rh_ub) const;
-  virtual relation_kind lhs_op1_relation (const irange &lhs,
-					   const irange &op1,
-					   const irange &op2,
-					   relation_kind rel) const;
-  virtual bool op1_op2_relation_effect (irange &lhs_range,
-					tree type,
-					const irange &op1_range,
-					const irange &op2_range,
-					relation_kind rel) const;
-  void update_bitmask (irange &r, const irange &lh, const irange &rh) const
-    { update_known_bitmask (r, MINUS_EXPR, lh, rh); }
-} op_minus;
+  update_known_bitmask (r, MINUS_EXPR, lh, rh);
+}
 
 void 
 operator_minus::wi_fold (irange &r, tree type,
@@ -4682,7 +4658,6 @@ pointer_or_operator::wi_fold (irange &r, tree type,
 
 integral_table::integral_table ()
 {
-  set (MINUS_EXPR, op_minus);
   set (MIN_EXPR, op_min);
   set (MAX_EXPR, op_max);
   set (MULT_EXPR, op_mult);