tree.def (TARGET_MEM_REF): Update comment.

	* tree.def (TARGET_MEM_REF): Update comment.
	* alias.c (get_alias_set): Retrieve the original memory reference for
	a TARGET_MEM_REF before proceeding.

From-SVN: r153796

gcc/ChangeLog

+2009-11-01  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* tree.def (TARGET_MEM_REF): Update comment.
+	* alias.c (get_alias_set): Retrieve the original memory reference for
+	a TARGET_MEM_REF before proceeding.
+
 2009-10-31  Anatoly Sokolov  <aesok@post.ru>
 
 	* config/frv/frv.c (frv_function_value, frv_libcall_value,

gcc/alias.c

@@ -640,7 +640,7 @@ get_alias_set (tree t)
      aren't types.  */
   if (! TYPE_P (t))
     {
-      tree inner = t;
+      tree inner;
 
       /* Remove any nops, then give the language a chance to do
 	 something with this tree before we look at it.  */
@@ -649,8 +649,13 @@ get_alias_set (tree t)
       if (set != -1)
 	return set;
 
+      /* Retrieve the original memory reference if needed.  */
+      if (TREE_CODE (t) == TARGET_MEM_REF)
+	t = TMR_ORIGINAL (t);
+
       /* First see if the actual object referenced is an INDIRECT_REF from a
 	 restrict-qualified pointer or a "void *".  */
+      inner = t;
       while (handled_component_p (inner))
 	{
 	  inner = TREE_OPERAND (inner, 0);

gcc/testsuite/ChangeLog

+2009-11-01  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/opt5.adb: New test.
+
 2009-11-01  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/41872

gcc/testsuite/gnat.dg/opt5.adb

+-- { dg-do run }
+-- { dg-options "-O2" }
+
+procedure Opt5 is
+
+   type Varray is array (1 .. 4) of Natural;
+
+   procedure Check_All_Ones (A : Varray) is
+   begin
+      for J in A'Range loop
+         if (A (J)) /= 1 then
+            raise Program_Error;
+         end if;
+      end loop;
+   end;
+
+   X : constant Varray := (1, 1, 1, 1);
+
+begin
+   Check_All_Ones (X);
+end;

gcc/tree.def

@@ -967,9 +967,9 @@ DEFTREECODE (REALIGN_LOAD_EXPR, "realign_load", tcc_expression, 3)
 
    The type of STEP, INDEX and OFFSET is sizetype.  The type of BASE is
    sizetype or a pointer type (if SYMBOL is NULL).
-   
+
    The sixth argument is the reference to the original memory access, which
-   is preserved for the purposes of the RTL alias analysis.  */
+   is preserved for the purpose of alias analysis.  */
 
 DEFTREECODE (TARGET_MEM_REF, "target_mem_ref", tcc_reference, 6)