fold-const.c (const_binop, [...]): Do not set TREE_CONSTANT_OVERFLOW.

2009-03-30  Paolo Bonzini  <bonzini@gnu.org>

        * fold-const.c (const_binop, fold_convert_const_real_from_fixed,
        fold_convert_const_fixed_from_fixed,
        fold_convert_const_fixed_from_int,
        fold_convert_const_fixed_from_real, fold_negate_const): Do not
        set TREE_CONSTANT_OVERFLOW.
        * tree.def: Remove mention of TREE_CONSTANT_OVERFLOW.
        * tree.h (TREE_CONSTANT_OVERFLOW): Delete.

From-SVN: r145281

gcc/ChangeLog

+2009-03-30  Paolo Bonzini  <bonzini@gnu.org>
+
+	* fold-const.c (const_binop, fold_convert_const_real_from_fixed,
+	fold_convert_const_fixed_from_fixed,
+	fold_convert_const_fixed_from_int,
+	fold_convert_const_fixed_from_real, fold_negate_const): Do not
+	set TREE_CONSTANT_OVERFLOW.
+	* tree.def: Remove mention of TREE_CONSTANT_OVERFLOW.
+	* tree.h (TREE_CONSTANT_OVERFLOW): Delete.
+
 2009-03-30  Ira Rosen  <irar@il.ibm.com>
 
 	* tree-vect-loop-manip.c: New file.

gcc/fold-const.c

@@ -1932,12 +1932,7 @@ const_binop (enum tree_code code, tree arg1, tree arg2, int notrunc)
       t = build_fixed (type, result);
       /* Propagate overflow flags.  */
       if (overflow_p | TREE_OVERFLOW (arg1) | TREE_OVERFLOW (arg2))
-	{
-	  TREE_OVERFLOW (t) = 1;
-	  TREE_CONSTANT_OVERFLOW (t) = 1;
-	}
-      else if (TREE_CONSTANT_OVERFLOW (arg1) | TREE_CONSTANT_OVERFLOW (arg2))
-	TREE_CONSTANT_OVERFLOW (t) = 1;
+	TREE_OVERFLOW (t) = 1;
       return t;
     }
 
@@ -2304,8 +2299,6 @@ fold_convert_const_real_from_fixed (tree type, const_tree arg1)
   t = build_real (type, value);
 
   TREE_OVERFLOW (t) = TREE_OVERFLOW (arg1);
-  TREE_CONSTANT_OVERFLOW (t)
-    = TREE_OVERFLOW (t) | TREE_CONSTANT_OVERFLOW (arg1);
   return t;
 }
 
@@ -2325,12 +2318,7 @@ fold_convert_const_fixed_from_fixed (tree type, const_tree arg1)
 
   /* Propagate overflow flags.  */
   if (overflow_p | TREE_OVERFLOW (arg1))
-    {
-      TREE_OVERFLOW (t) = 1;
-      TREE_CONSTANT_OVERFLOW (t) = 1;
-    }
-  else if (TREE_CONSTANT_OVERFLOW (arg1))
-    TREE_CONSTANT_OVERFLOW (t) = 1;
+    TREE_OVERFLOW (t) = 1;
   return t;
 }
 
@@ -2352,12 +2340,7 @@ fold_convert_const_fixed_from_int (tree type, const_tree arg1)
 
   /* Propagate overflow flags.  */
   if (overflow_p | TREE_OVERFLOW (arg1))
-    {
-      TREE_OVERFLOW (t) = 1;
-      TREE_CONSTANT_OVERFLOW (t) = 1;
-    }
-  else if (TREE_CONSTANT_OVERFLOW (arg1))
-    TREE_CONSTANT_OVERFLOW (t) = 1;
+    TREE_OVERFLOW (t) = 1;
   return t;
 }
 
@@ -2378,12 +2361,7 @@ fold_convert_const_fixed_from_real (tree type, const_tree arg1)
 
   /* Propagate overflow flags.  */
   if (overflow_p | TREE_OVERFLOW (arg1))
-    {
-      TREE_OVERFLOW (t) = 1;
-      TREE_CONSTANT_OVERFLOW (t) = 1;
-    }
-  else if (TREE_CONSTANT_OVERFLOW (arg1))
-    TREE_CONSTANT_OVERFLOW (t) = 1;
+    TREE_OVERFLOW (t) = 1;
   return t;
 }
 
@@ -15228,12 +15206,7 @@ fold_negate_const (tree arg0, tree type)
 	t = build_fixed (type, f);
 	/* Propagate overflow flags.  */
 	if (overflow_p | TREE_OVERFLOW (arg0))
-	  {
-	    TREE_OVERFLOW (t) = 1;
-	    TREE_CONSTANT_OVERFLOW (t) = 1;
-	  }
-	else if (TREE_CONSTANT_OVERFLOW (arg0))
-	  TREE_CONSTANT_OVERFLOW (t) = 1;
+	  TREE_OVERFLOW (t) = 1;
 	break;
       }
 

gcc/tree.def

@@ -268,9 +268,8 @@ DEFTREECODE (LANG_TYPE, "lang_type", tcc_type, 0)
 /* Contents are in TREE_INT_CST_LOW and TREE_INT_CST_HIGH fields,
    32 bits each, giving us a 64 bit constant capability.  INTEGER_CST
    nodes can be shared, and therefore should be considered read only.
-   They should be copied, before setting a flag such as
-   TREE_OVERFLOW.  If an INTEGER_CST has TREE_OVERFLOW or
-   TREE_CONSTANT_OVERFLOW already set, it is known to be unique.
+   They should be copied, before setting a flag such as TREE_OVERFLOW.
+   If an INTEGER_CST has TREE_OVERFLOW already set, it is known to be unique.
    INTEGER_CST nodes are created for the integral types, for pointer
    types and for vector and float types in some circumstances.  */
 DEFTREECODE (INTEGER_CST, "integer_cst", tcc_constant, 0)

gcc/tree.h

@@ -1186,9 +1186,6 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int,
 
 #define TREE_OVERFLOW(NODE) (CST_CHECK (NODE)->base.public_flag)
 
-/* ??? This is an obsolete synonym for TREE_OVERFLOW.  */
-#define TREE_CONSTANT_OVERFLOW(NODE) TREE_OVERFLOW(NODE)
-
 /* TREE_OVERFLOW can only be true for EXPR of CONSTANT_CLASS_P.  */
 
 #define TREE_OVERFLOW_P(EXPR) \