BOUNCE rtl@rtlinux.org: Approval required: Non-member submissionfrom [Laurent.Kersten@alcatel.be] (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Fri May 18 01:36:32 2001
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From: Laurent.Kersten@alcatel.be
To: rtl@fsmlabs.com
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Date: Fri, 18 May 2001 09:31:30 +0200
Subject: Re: [rtl] Bug in llimd in RTAI (version 1.5 and 1.6)
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I tested it and it works  perfectly

Thanks
Laurent





Paolo Mantegazza <mantegazza@aero.polimi.it> on 05/17/2001 03:05:30 PM

Please respond to rtl@fsmlabs.com
                                                              
                                                              
                                                              
 To:      Laurent KERSTEN/BE/ALCATEL@ALCATEL, rtl@rtlinux.org 
                                                              
 cc:                                                          
                                                              
                                                              
                                                              
 Subject: Re: [rtl] Bug in llimd in RTAI (version 1.5 and     
          1.6)                                                
                                                              





Laurent.Kersten@alcatel.be wrote:
>
> Hello,
>
> Whether I try to use llimd with a negative number as first argument, I got a crash (or an
> arithmetic exception if I use the function in a normal linux process).
>
> The following call crash : llimd ( -25 000 000,400 000 000, 1000 000)
> But the following seems OK :   llimd ( 25 000 000,400 000 000, 1000 000)
>
> In a non RT task, the exception is generated by the first div instruction. According to Intel's
> documentation, it should trigger an exception when the result is too big for the target register, this seems not to be the case (as long as we don't treat the EDX:EAX pairs has an unsigned number but as a negative one, it should be no problem).
>
> Does anybody have a clue for that ?

The name is a misnomer, it should be ullmid. It so by design, it is up
to you to wrap it with a test for the sign. See nano2count and
count2nano in RTAI schedulers.

Ciao, Paolo..
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