simplify-rtx.c (simplify_binary_operation): Simplify contents of CONST.

        * simplify-rtx.c (simplify_binary_operation): Simplify contents
        of CONST.

From-SVN: r45447

gcc/ChangeLog

+2001-09-06  Richard Henderson  <rth@redhat.com>
+
+	* simplify-rtx.c (simplify_binary_operation): Simplify contents
+	of CONST.
+
 2001-09-06  Franz Sirl  <Franz.Sirl-kernel@lauterbach.com>
 
 	* config/rs6000/rs6000.c (rs6000_emit_prologue): Fix DWARF2 register

gcc/simplify-rtx.c

@@ -1275,6 +1275,28 @@ simplify_binary_operation (code, mode, op0, op1)
 	       return simplify_gen_binary (AND, mode, op0,
 					   gen_rtx_NOT (mode, XEXP (op1, 0)));
 	   }
+
+	  /* Simplify operations with constants containing embedded offsets.  */
+	  if (GET_CODE (op0) == CONST)
+	    {
+	      tem = simplify_binary_operation (code, mode, XEXP (op0, 0), op1);
+	      if (tem)
+		{
+		  if (CONSTANT_P (op1) && ! CONSTANT_P (tem))
+		    tem = gen_rtx_CONST (mode, tem);
+		  return tem;
+		}
+	    }
+	  if (GET_CODE (op1) == CONST)
+	    {
+	      tem = simplify_binary_operation (code, mode, op0, XEXP (op1, 0));
+	      if (tem)
+		{
+		  if (CONSTANT_P (op0) && ! CONSTANT_P (tem))
+		    tem = gen_rtx_CONST (mode, tem);
+		  return tem;
+		}
+	    }
 	  break;
 
 	case MULT: