Re: expression function bug or think?

[Bill Findlay <yaldnif.w@blueyonder.co.uk>]

On 16/06/2011 21:41, in article m2tybp1pce.fsf@pushface.org, "Simon Wright"
<simon@pushface.org> wrote:

> GNAT GPL 2011, without -gnatp:
> 
> functions_E : short_integer := 0;
> 
> package functions is
>    function functions__fib (n : natural) return natural;
> 
>    function functions__fib (n : natural) return natural is
>    begin
>       return
>          do
>             T2s : natural;[constraint_error when
>               not (n - 1 >= 0)
>               "range check failed"][constraint_error when
>               not (n - 2 >= 0)
>               "range check failed"][constraint_error when
>               not (interfaces__unsigned_32!(n) <= 16#7FFF_FFFF#)
>               "invalid data"]
>             case n is
>                when 0 =>
>                   T2s := 0;
>                when 1 =>
>                   T2s := 1;
>                when others =>
>                   T2s := functions__fib (n - 1) + functions__fib (n -
>                     2);
>             end case;
>          in T2s end
>       ;
>    end functions__fib;
> end functions;
> 
> 
> 
> Pretty conclusive, I think!

So it would seem, but without -gnatp I get exactly the same result as you do
with -gnatp:

> /Users/wf: gnatmake  -gnat12 -gnatl -gnatG run_fib.adb >nop.txt
> gcc -c -gnat12 -gnatl -gnatG run_fib.adb
> gcc -c -gnat12 -gnatl -gnatG functions.ads
> gnatbind -x run_fib.ali
> gnatlink run_fib.ali
> 
> /Users/wf: cat nop.txt
> 
> GNAT GPL 2011 (20110419)
> Copyright 1992-2011, Free Software Foundation, Inc.
> Source recreated from tree for Run_Fib (body)
> ---------------------------------------------
> 
> ....
> 
> GNAT GPL 2011 (20110419)
> Copyright 1992-2011, Free Software Foundation, Inc.
> Source recreated from tree for Functions (spec)
> -----------------------------------------------
> 
> functions_E : short_integer := 0;
> 
> package functions is
>    function functions__fib (n : natural) return natural;
> 
>    function functions__fib (n : natural) return natural is
>    begin
>       return
>          do
>             T2s : natural;
>             case n is
>                when 0 =>
>                   T2s := 0;
>                when 1 =>
>                   T2s := 1;
>                when others =>
>                   T2s := functions__fib (n - 1) + functions__fib (n -
>                     2);
>             end case;
>          in T2s end
>       ;
>    end functions__fib;
> end functions;
> 

?

-- 
Bill Findlay
with blueyonder.co.uk;
use  surname & forename;