From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_00,FROM_LOCAL_HEX, FROM_STARTS_WITH_NUMS autolearn=no autolearn_force=no version=3.4.4 X-Google-Thread: 103376,7e8cebf09cf80560 X-Google-NewGroupId: yes X-Google-Attributes: gida07f3367d7,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news4.google.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Vinzent Hoefler" <0439279208b62c95f1880bf0f8776eeb@t-domaingrabbing.de> Newsgroups: comp.lang.ada Subject: Re: How would Ariane 5 have behaved if overflow checking were not turned off? Date: Tue, 15 Mar 2011 20:57:41 +0100 Message-ID: References: <82d3lsvqw7.fsf@stephe-leake.org> <87ipvk6vva.fsf@mid.deneb.enyo.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit X-Trace: individual.net h8kOPFmfH14AF8qJnxA8KAirnl7GJmi7It82vlLArVlRAHH06l Cancel-Lock: sha1:f4N25KT8J7G4pvYIQScJMCnCrg4= User-Agent: Opera Mail/11.01 (Win32) Xref: g2news1.google.com comp.lang.ada:18223 Date: 2011-03-15T20:57:41+01:00 List-Id: Florian Weimer wrote: > It's odd that after all those years, little hard data is available on > the defect. The published report uses terminology which is a slightly > bit off in the Ada context, so it led only to further speculation. Hmm? From the report: |The internal SRI software exception was caused during execution of a |data conversion from 64-bit floating point to 16-bit signed integer |value. The floating point number which was converted had a value greater |than what could be represented by a 16-bit signed integer. This resulted |in an Operand Error. The data conversion instructions (in Ada code) were |not protected from causing an Operand Error, although other conversions |of comparable variables in the same place in the code were protected. "Operand Error" is what Motorola (now Freescale) just calls it in their CPU manual. Vinzent. -- A C program is like a fast dance on a newly waxed dance floor by people carrying razors. -- Waldi Ravens