Re: Eliminating copying in Gnat

[porton@ex-code.com (Victor Porton)]

In article <uiswjamfw.fsf@nasa.gov>,
	Stephen Leake <Stephen.A.Leake@nasa.gov> writes:
> porton@ex-code.com (Victor Porton) writes:
> 
>> Is it possible to cause Gnat to not do unnecessary copying
>> when calling this fynction?
>> 
>> If T is a controlled type, it calls Adjust 3(!) times even if I
>> compile with optimization ("-O3 -gnatN").
> 
> Post complete code that demonstrates this; maybe I'll have other
> suggestions. 
> 
>> It is in Gnat-3.14p. May be it was fixed in Gnat-3.2/3.15p?

I don't see any relevant problems about inlining even if all
warnings are on (however it does not inline an unrelevant library 
function). But Adjust is called 3 times :-(

-- m.adb --
with P;
procedure M is
    function Pass(X: P.T) return P.T is
        pragma Inline(Pass);
    begin
	return X;
    end;
    X: P.T;
    Y: P.T := Pass(X);
begin
    null;
end M;

-- p.ads --
with Ada.Finalization;
package P is
    type T is new Ada.Finalization.Controlled with null record;
    procedure Adjust(Object: in out T);
end P;

-- p.adb --
with Ada.Text_IO;
package body P is
    procedure Adjust (Object: in out T) is
    begin
       Ada.Text_IO.Put_Line("QWER");
    end Adjust;
end P;