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[Ada] Small improvement to function returns

The compiler can generate complex code to extract the individual values of the 
RETURN structure generated for the Copy-In Copy-Out mechanism, especially on 
64-bit platforms.

Fixed thusly, tested on i586-suse-linux, applied on the mainline.

2010-04-07  Eric Botcazou  <>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Procedure>: Set default
	alignment on the RETURN type built for the Copy-In Copy-Out mechanism.

Eric Botcazou
Index: gcc-interface/decl.c
--- gcc-interface/decl.c	(revision 157983)
+++ gcc-interface/decl.c	(working copy)
@@ -4062,6 +4062,9 @@ gnat_to_gnu_entity (Entity_Id gnat_entit
 		    gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
 		    gnu_return_type = make_node (RECORD_TYPE);
 		    TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
+		    /* Set a default alignment to speed up accesses.  */
+		    TYPE_ALIGN (gnu_return_type)
+		      = get_mode_alignment (ptr_mode);
 		    has_copy_in_out = true;

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