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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Static vs dynamic evaluation anomaly?
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Date: Wed, 07 Feb 2007 11:00:55 +0100
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Date: 2007-02-07T11:00:55+01:00
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Steve writes:
> Adam Beneschanwrote
>> On Feb 6, 9:29 am, Matt Jaffe wrote:
>>
>>> Any further help in explaining these anomalies would be much appreciated. 
>>> (It's always possible we've stumbled across a compiler bug; but I am 
>>> reluctant to come to that conclusion prematurely.)
>>
>> I'm not so reluctant.  It's a compiler bug.
>>
>> The following program produces incorrect results on GNAT, or at least
>> on the version I'm using:
>>
>> with Ada.Text_IO;
>> procedure test271 is
>>    type Six_Bits is mod 2**6;
>>    package Six_Bit_IO is new Ada.Text_IO.Modular_IO(Six_Bits);
>>    X : Six_Bits := 31;
>> begin
>>    for J in 0..5 loop
>>        Ada.Text_IO.Put ("When J=" & Integer'image(J));
>>        Ada.Text_IO.Put (", X*2**J =");
>>        Six_Bit_IO.Put(X*2**J);
>>        Ada.Text_IO.New_Line;
>>    end loop;
>> end test271;
>>
>
> One more data point... ObjectAda 7.2.2 gives the result:
>
> When J= 0, X*2**J = 31
> When J= 1, X*2**J = 62
> When J= 2, X*2**J = 60
> When J= 3, X*2**J = 56
> When J= 4, X*2**J = 48
> When J= 5, X*2**J = 32
>
> Which I believe is correct,
> Regards,


Actually I'll take back what I said earlier.  With Debian gnat
4.1.1-22 I also get these seemingly correct results.

-- 
Ludovic Brenta.