From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Subject: Re: Static vs dynamic evaluation anomaly?
Date: Wed, 07 Feb 2007 11:00:55 +0100
Date: 2007-02-07T11:00:55+01:00 [thread overview]
Message-ID: <87d54mguco.fsf@ludovic-brenta.org> (raw)
In-Reply-To: HI6dnX9pKMXb1VTYnZ2dnUVZ_vupnZ2d@comcast.com
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.
next prev parent reply other threads:[~2007-02-07 10:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <12shen4qjhv41a7@corp.supernews.com>
2007-02-06 19:17 ` Static vs dynamic evaluation anomaly? Jeffrey R. Carter
2007-02-06 20:01 ` Adam Beneschan
2007-02-06 20:15 ` Ludovic Brenta
2007-02-06 23:38 ` Matt.Jaffe
[not found] ` <12sipb529oilnab@corp.supernews.com>
2007-02-07 10:05 ` Ludovic Brenta
2007-02-07 21:54 ` Simon Wright
2007-02-09 12:39 ` GNAT's version Peter Hermann
2007-02-07 3:32 ` Static vs dynamic evaluation anomaly? Steve
2007-02-07 10:00 ` Ludovic Brenta [this message]
2007-02-07 10:21 ` Georg Bauhaus
2007-02-07 16:44 ` Adam Beneschan
2007-02-07 18:27 ` Jeffrey R. Carter
2007-02-07 18:55 ` Adam Beneschan
2007-02-07 21:52 ` Simon Wright
2007-02-08 0:48 ` Jeffrey R. Carter
2007-02-08 1:26 ` Adam Beneschan
2007-02-08 18:44 ` Jeffrey R. Carter
2007-02-09 7:57 ` Stefan Lucks
2007-02-09 18:50 ` Jeffrey R. Carter
2007-02-09 21:12 ` Stefan Lucks
2007-02-10 5:22 ` Jeffrey R. Carter
2007-02-10 12:29 ` Ludovic Brenta
2007-02-08 6:57 ` Matt Jaffe
2007-02-08 9:01 ` Ludovic Brenta
2007-02-08 10:32 ` Georg Bauhaus
2007-02-08 11:13 ` Jean-Pierre Rosen
2007-02-08 13:02 ` Ludovic Brenta
2007-02-07 21:46 ` Matt.Jaffe
2007-02-07 6:24 ` AW: " Grein, Christoph (Fa. ESG)
2007-02-07 6:59 ` Stefan Lucks
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