[COMMITTED 12/17] - Add a hybrid MAX_EXPR operator for integer and pointer.

[COMMITTED 12/17] - Add a hybrid MAX_EXPR operator for integer and pointer.

[Andrew MacLeod]

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Add a hybrid operator to choose between integer and pointer versions at 
runtime.

This is the last use of the pointer table, so it is also removed.

Bootstraps on x86_64-pc-linux-gnu with no regressions.  Pushed.

Andrew

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From cd194f582c5be3cc91e025e304e2769f61ceb6b6 Mon Sep 17 00:00:00 2001
From: Andrew MacLeod <amacleod@redhat.com>
Date: Sat, 10 Jun 2023 16:35:18 -0400
Subject: [PATCH 12/17] Add a hybrid MAX_EXPR operator for integer and pointer.

This adds an operator to the unified table for MAX_EXPR which will
select either the pointer or integer version based on the type passed
to the method.   This is for use until we have a seperate PRANGE class.

THIs also removes the pointer table which is no longer needed.

	* range-op-mixed.h (operator_max): Remove final.
	* range-op-ptr.cc (pointer_table::pointer_table): Remove MAX_EXPR.
	(pointer_table::pointer_table): Remove.
	(class hybrid_max_operator): New.
	(range_op_table::initialize_pointer_ops): Add hybrid_max_operator.
	* range-op.cc (pointer_tree_table): Remove.
	(unified_table::unified_table): Comment out MAX_EXPR.
	(get_op_handler): Remove check of pointer table.
	* range-op.h (class pointer_table): Remove.
---
 gcc/range-op-mixed.h |  6 +++---
 gcc/range-op-ptr.cc  | 30 ++++++++++++++++++++----------
 gcc/range-op.cc      | 10 ++--------
 gcc/range-op.h       |  9 ---------
 4 files changed, 25 insertions(+), 30 deletions(-)

diff --git a/gcc/range-op-mixed.h b/gcc/range-op-mixed.h
index a65935435c2..bdc488b8754 100644
--- a/gcc/range-op-mixed.h
+++ b/gcc/range-op-mixed.h
@@ -636,10 +636,10 @@ class operator_max : public range_operator
 {
 public:
   void update_bitmask (irange &r, const irange &lh,
-      const irange &rh) const final override;
-private:
+      const irange &rh) const override;
+protected:
   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;
+		const wide_int &rh_ub) const override;
 };
 #endif // GCC_RANGE_OP_MIXED_H
diff --git a/gcc/range-op-ptr.cc b/gcc/range-op-ptr.cc
index 483e43ca994..ea66fe9056b 100644
--- a/gcc/range-op-ptr.cc
+++ b/gcc/range-op-ptr.cc
@@ -157,7 +157,6 @@ pointer_min_max_operator::wi_fold (irange &r, tree type,
     r.set_varying (type);
 }
 
-
 class pointer_and_operator : public range_operator
 {
 public:
@@ -265,14 +264,6 @@ operator_pointer_diff::op1_op2_relation_effect (irange &lhs_range, tree type,
 					rel);
 }
 
-// When PRANGE is implemented, these are all the opcodes which are currently
-// expecting routines with PRANGE signatures.
-
-pointer_table::pointer_table ()
-{
-  set (MAX_EXPR, op_ptr_min_max);
-}
-
 // ----------------------------------------------------------------------
 // Hybrid operators for the 4 operations which integer and pointers share,
 // but which have different implementations.  Simply check the type in
@@ -404,8 +395,26 @@ public:
     }
 } op_hybrid_min;
 
+class hybrid_max_operator : public operator_max
+{
+public:
+  void update_bitmask (irange &r, const irange &lh,
+		       const irange &rh) const final override
+    {
+      if (!r.undefined_p () && INTEGRAL_TYPE_P (r.type ()))
+	operator_max::update_bitmask (r, lh, rh);
+    }
 
-
+  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
+    {
+      if (INTEGRAL_TYPE_P (type))
+	return operator_max::wi_fold (r, type, lh_lb, lh_ub, rh_lb, rh_ub);
+      else
+	return op_ptr_min_max.wi_fold (r, type, lh_lb, lh_ub, rh_lb, rh_ub);
+    }
+} op_hybrid_max;
 
 // Initialize any pointer operators to the primary table
 
@@ -417,4 +426,5 @@ range_op_table::initialize_pointer_ops ()
   set (BIT_AND_EXPR, op_hybrid_and);
   set (BIT_IOR_EXPR, op_hybrid_or);
   set (MIN_EXPR, op_hybrid_min);
+  set (MAX_EXPR, op_hybrid_max);
 }
diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index 481f3b1324d..046b7691bb6 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -49,8 +49,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-ssa-ccp.h"
 #include "range-op-mixed.h"
 
-pointer_table pointer_tree_table;
-
 // Instantiate a range_op_table for unified operations.
 class unified_table : public range_op_table
 {
@@ -124,18 +122,14 @@ unified_table::unified_table ()
   // set (BIT_AND_EXPR, op_bitwise_and);
   // set (BIT_IOR_EXPR, op_bitwise_or);
   // set (MIN_EXPR, op_min);
-  set (MAX_EXPR, op_max);
+  // set (MAX_EXPR, op_max);
 }
 
 // The tables are hidden and accessed via a simple extern function.
 
 range_operator *
-get_op_handler (enum tree_code code, tree type)
+get_op_handler (enum tree_code code, tree)
 {
-  // If this is pointer type and there is pointer specifc routine, use it.
-  if (POINTER_TYPE_P (type) && pointer_tree_table[code])
-    return pointer_tree_table[code];
-
   return unified_tree_table[code];
 }
 
diff --git a/gcc/range-op.h b/gcc/range-op.h
index 08c51bace40..15c45137af2 100644
--- a/gcc/range-op.h
+++ b/gcc/range-op.h
@@ -299,15 +299,6 @@ range_op_table::set (enum tree_code code, range_operator &op)
   m_range_tree[code] = &op;
 }
 
-// Instantiate a range op table for pointer operations.
-
-class pointer_table : public range_op_table
-{
-public:
-  pointer_table ();
-};
-extern pointer_table pointer_tree_table;
-
 extern range_operator *ptr_op_widen_mult_signed;
 extern range_operator *ptr_op_widen_mult_unsigned;
 extern range_operator *ptr_op_widen_plus_signed;
-- 
2.40.1