tree.c (commutative_tree_code, [...]): New functions.

	* tree.c (commutative_tree_code, associative_tree_code): New
	functions.
	(iterative_hash_expr): Use commutative_tree_code.
	* tree.h (commutative_tree_code, associative_tree_code): Declare.
	* fold-const.c (operand_equal_p): Use commutative_tree_code
	rather than inlining the commutativity check.
	(fold): Likewise.

Co-Authored-By: Roger Sayle <roger@eyesopen.com>

From-SVN: r77152

gcc/ChangeLog

+2004-02-02  Jeff Law  <law@redhat.com>
+	    Roger Sayle  <roger@eyesopen.com>
+
+	* tree.c (commutative_tree_code, associative_tree_code): New
+	functions.
+	(iterative_hash_expr): Use commutative_tree_code.
+	* tree.h (commutative_tree_code, associative_tree_code): Declare.
+	* fold-const.c (operand_equal_p): Use commutative_tree_code
+	rather than inlining the commutativity check.
+	(fold): Likewise.
+
 2004-02-02  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* system.h (FUNCTION_ARG_KEEP_AS_REFERENCE): Poison.

gcc/fold-const.c

@@ -833,7 +833,6 @@ negate_mathfn_p (enum built_in_function code)
   return false;
 }
 
-
 /* Determine whether an expression T can be cheaply negated using
    the function negate_expr.  */
 
@@ -2105,12 +2104,7 @@ operand_equal_p (tree arg0, tree arg1, int only_const)
 	return 1;
 
       /* For commutative ops, allow the other order.  */
-      return ((TREE_CODE (arg0) == PLUS_EXPR || TREE_CODE (arg0) == MULT_EXPR
-	       || TREE_CODE (arg0) == MIN_EXPR || TREE_CODE (arg0) == MAX_EXPR
-	       || TREE_CODE (arg0) == BIT_IOR_EXPR
-	       || TREE_CODE (arg0) == BIT_XOR_EXPR
-	       || TREE_CODE (arg0) == BIT_AND_EXPR
-	       || TREE_CODE (arg0) == NE_EXPR || TREE_CODE (arg0) == EQ_EXPR)
+      return (commutative_tree_code (TREE_CODE (arg0))
 	      && operand_equal_p (TREE_OPERAND (arg0, 0),
 				  TREE_OPERAND (arg1, 1), 0)
 	      && operand_equal_p (TREE_OPERAND (arg0, 1),
@@ -5299,9 +5293,7 @@ fold (tree expr)
 
   /* If this is a commutative operation, and ARG0 is a constant, move it
      to ARG1 to reduce the number of tests below.  */
-  if ((code == PLUS_EXPR || code == MULT_EXPR || code == MIN_EXPR
-       || code == MAX_EXPR || code == BIT_IOR_EXPR || code == BIT_XOR_EXPR
-       || code == BIT_AND_EXPR)
+  if (commutative_tree_code (code)
       && tree_swap_operands_p (arg0, arg1, true))
     return fold (build (code, type, arg1, arg0));
 

gcc/tree.c

@@ -3538,6 +3538,55 @@ compare_tree_int (tree t, unsigned HOST_WIDE_INT u)
     return 1;
 }
 
+/* Return true if CODE represents an associative tree code.  Otherwise
+   return false.  */
+bool
+associative_tree_code (enum tree_code code)
+{
+  switch (code)
+    {
+    case BIT_IOR_EXPR:
+    case BIT_AND_EXPR:
+    case BIT_XOR_EXPR:
+    case PLUS_EXPR:
+    case MINUS_EXPR:
+    case MULT_EXPR:
+    case LSHIFT_EXPR:
+    case RSHIFT_EXPR:
+    case MIN_EXPR:
+    case MAX_EXPR:
+      return true;
+
+    default:
+      break;
+    }
+  return false;
+}
+
+/* Return true if CODE represents an commutative tree code.  Otherwise
+   return false.  */
+bool
+commutative_tree_code (enum tree_code code)
+{
+  switch (code)
+    {
+    case PLUS_EXPR:
+    case MULT_EXPR:
+    case MIN_EXPR:
+    case MAX_EXPR:
+    case BIT_IOR_EXPR:
+    case BIT_XOR_EXPR:
+    case BIT_AND_EXPR:
+    case NE_EXPR:
+    case EQ_EXPR:
+      return true;
+
+    default:
+      break;
+    }
+  return false;
+}
+
 /* Generate a hash value for an expression.  This can be used iteratively
    by passing a previous result as the "val" argument.
 
@@ -3595,9 +3644,7 @@ iterative_hash_expr (tree t, hashval_t val)
 	  || code == NON_LVALUE_EXPR)
 	val = iterative_hash_object (TREE_TYPE (t), val);
 
-      if (code == PLUS_EXPR || code == MULT_EXPR || code == MIN_EXPR
-	  || code == MAX_EXPR || code == BIT_IOR_EXPR || code == BIT_XOR_EXPR
-	  || code == BIT_AND_EXPR || code == NE_EXPR || code == EQ_EXPR)
+      if (commutative_tree_code (code))
 	{
 	  /* It's a commutative expression.  We want to hash it the same
 	     however it appears.  We do this by first hashing both operands

gcc/tree.h

@@ -2713,6 +2713,8 @@ extern tree get_callee_fndecl (tree);
 extern void change_decl_assembler_name (tree, tree);
 extern int type_num_arguments (tree);
 extern tree lhd_unsave_expr_now (tree);
+extern bool associative_tree_code (enum tree_code);
+extern bool commutative_tree_code (enum tree_code);
 
 
 /* In stmt.c */