c-typeck.c (null_pointer_constant_p): Replace use of TREE_CONSTANT_OVERFLOW with TREE_OVERFLOW.

	* c-typeck.c (null_pointer_constant_p): Replace use of
	TREE_CONSTANT_OVERFLOW with TREE_OVERFLOW.
	(build_c_cast): Likewise.

From-SVN: r120747

gcc/ChangeLog

 2007-01-12  Roger Sayle  <roger@eyesopen.com>
 
+	* c-typeck.c (null_pointer_constant_p): Replace use of
+	TREE_CONSTANT_OVERFLOW with TREE_OVERFLOW.
+	(build_c_cast): Likewise.
+
+2007-01-12  Roger Sayle  <roger@eyesopen.com>
+
 	* tree.h (force_fit_type_double): Remove unused final argument.
 	* c-common.c (constant_expression_warning): Replace use of
 	TREE_CONSTANT_OVERFLOW with TREE_OVERFLOW.

gcc/c-typeck.c

 /* Build expressions with type checking for C compiler.
    Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -117,7 +117,7 @@ null_pointer_constant_p (tree expr)
      yet available everywhere required.  */
   tree type = TREE_TYPE (expr);
   return (TREE_CODE (expr) == INTEGER_CST
-	  && !TREE_CONSTANT_OVERFLOW (expr)
+	  && !TREE_OVERFLOW (expr)
 	  && integer_zerop (expr)
 	  && (INTEGRAL_TYPE_P (type)
 	      || (TREE_CODE (type) == POINTER_TYPE
@@ -3588,15 +3588,16 @@ build_c_cast (tree type, tree expr)
       /* Ignore any integer overflow caused by the cast.  */
       if (TREE_CODE (value) == INTEGER_CST)
 	{
-	  if (CONSTANT_CLASS_P (ovalue)
-	      && (TREE_OVERFLOW (ovalue) || TREE_CONSTANT_OVERFLOW (ovalue)))
+	  if (CONSTANT_CLASS_P (ovalue) && TREE_OVERFLOW (ovalue))
 	    {
-	      /* Avoid clobbering a shared constant.  */
-	      value = copy_node (value);
-	      TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
-	      TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue);
+	      if (!TREE_OVERFLOW (value))
+		{
+		  /* Avoid clobbering a shared constant.  */
+		  value = copy_node (value);
+		  TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
+		}
 	    }
-	  else if (TREE_OVERFLOW (value) || TREE_CONSTANT_OVERFLOW (value))
+	  else if (TREE_OVERFLOW (value))
 	    /* Reset VALUE's overflow flags, ensuring constant sharing.  */
 	    value = build_int_cst_wide (TREE_TYPE (value),
 					TREE_INT_CST_LOW (value),