From: "Steve" <nospam_steved94@comcast.net>
Subject: Re: Static vs dynamic evaluation anomaly?
Date: Tue, 6 Feb 2007 19:32:57 -0800
Date: 2007-02-06T19:32:57-08:00 [thread overview]
Message-ID: <HI6dnX9pKMXb1VTYnZ2dnUVZ_vupnZ2d@comcast.com> (raw)
In-Reply-To: 1170792077.235994.10900@q2g2000cwa.googlegroups.com
"Adam Beneschan" <adam@irvine.com> wrote in message
news:1170792077.235994.10900@q2g2000cwa.googlegroups.com...
> On Feb 6, 9:29 am, Matt Jaffe <jaf...@cableone.net> 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,
Steve
(The Duck)
> -- Adam
>
next prev parent reply other threads:[~2007-02-07 3:32 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 ` Steve [this message]
2007-02-07 10:00 ` Static vs dynamic evaluation anomaly? Ludovic Brenta
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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