From: Brian Hurt <bhurt@janestcapital.com>
To: "Mattias Engdegård" <mattias@virtutech.se>
Cc: jon@ffconsultancy.com, caml-list@yquem.inria.fr
Subject: Re: [Caml-list] if (n:int) < 0 then (-n) > 0 is FALSE
Date: Fri, 08 Dec 2006 13:37:20 -0500 [thread overview]
Message-ID: <4579B0E0.9050304@janestcapital.com> (raw)
In-Reply-To: <200612081820.kB8IKL023123@virtutech.se>
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Mattias Engdegård wrote:
>>I wouldn't call it a bug. It looks like modulo arithmetic to me.
>>
>>
>
>Let's not make a virtue of necessity. The type "int" was likely designed
>with the intent to provide a type that could be used for actual integers
>in a variety of circumstances, while giving good performance. The modulo
>semantics is rarely useful (especially the 30-bit signed variety) but
>is the price paid for reasonable performance with a simple implementation.
>
>
Actually, the modulo behavior comes out of how the CPU designers made
the CPUs work decades ago. It was very easy for them to just drop all
those extra bits (or not even compute them). And, of course, now that
behavior is cast in stone...
Brian
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next prev parent reply other threads:[~2006-12-08 18:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-07 18:32 Pal-Kristian Engstad
2006-12-07 19:19 ` [Caml-list] " Jonathan Roewen
2006-12-07 19:43 ` Mattias Engdegård
2006-12-07 20:02 ` Brian Hurt
2006-12-08 2:37 ` skaller
2006-12-08 11:09 ` Mattias Engdegård
2006-12-08 17:48 ` Jon Harrop
2006-12-08 18:20 ` Mattias Engdegård
2006-12-08 18:37 ` Brian Hurt [this message]
2006-12-09 2:03 ` skaller
2006-12-07 21:13 ` Martin Jambon
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