gimple-fold.c (canonicalize_constructor_val): Strip only useless type conversions.

	* gimple-fold.c (canonicalize_constructor_val): Strip only useless type
	conversions.

From-SVN: r189685

gcc/ChangeLog

+2012-07-19  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gimple-fold.c (canonicalize_constructor_val): Strip only useless type
+	conversions.
+
 2012-07-19  Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/53942

gcc/gimple-fold.c

@@ -139,7 +139,7 @@ can_refer_decl_in_current_unit_p (tree decl, tree from_decl)
 tree
 canonicalize_constructor_val (tree cval, tree from_decl)
 {
-  STRIP_NOPS (cval);
+  STRIP_USELESS_TYPE_CONVERSION (cval);
   if (TREE_CODE (cval) == POINTER_PLUS_EXPR
       && TREE_CODE (TREE_OPERAND (cval, 1)) == INTEGER_CST)
     {

gcc/testsuite/ChangeLog

 2012-07-19  Eric Botcazou  <ebotcazou@adacore.com>
 
+	* gnat.dg/aggr20.ad[sb]: New test.
+	* gnat.dg/aggr20_pkg.ads: New helper.
+
+2012-07-19  Eric Botcazou  <ebotcazou@adacore.com>
+
 	* gnat.dg/derived_type3.adb: New test.
 	* gnat.dg/derived_type3_pkg.ad[sb]: New helper.
 

gcc/testsuite/gnat.dg/aggr20.adb

+-- { dg-do compile }
+
+package body Aggr20 is
+
+   procedure Proc (R : out Rec3) is
+   begin
+      R := (Callback => Nil_Rec2);
+   end;
+
+end Aggr20;

gcc/testsuite/gnat.dg/aggr20.ads

+with Aggr20_Pkg; use Aggr20_Pkg;
+with System;
+
+package Aggr20 is
+
+   type Rec1 is record
+      Address : System.Address;
+   end record;
+
+   Nil_Rec1 : constant Rec1 := (Address => Default_Nil_Address);
+
+   type Rec2 is record
+      Callback : Rec1;
+   end record;
+
+   Nil_Rec2 : constant Rec2 := (Callback => Nil_Rec1);
+
+   type Rec3 is record
+      Callback : Rec2;
+   end record;
+
+   procedure Proc (R : out Rec3);
+
+end Aggr20;

gcc/testsuite/gnat.dg/aggr20_pkg.ads

+with System;
+
+package Aggr20_Pkg is
+
+   procedure Proc;
+
+   Default_Nil_Address : constant System.Address := Proc'Address;
+
+end Aggr20_Pkg;