Re: [eigen] integer types - something's odd... |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] integer types - something's odd...*From*: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>*Date*: Mon, 7 Jun 2010 21:59:49 -0400*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=FcRVN4JrlwBcMHluO4bUgWYpmKSCZpgc1tZMQ9RwmbU=; b=BA7NN+zusnNt+JcqZ8q5+vxNds9nLPTTzi92CPpEaVLqirYlK4nsaxkOsYnBSde3My +0xQ7URCXZ7Sob5DUpqJY9a28sQwjlj1kUpOifaKwiz2XAZgGdLfL/5ZikciFEX6yAWC vQuqsNDM5NMgKv/MCMpce3CN3Rsi44gehPN0g=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=EGudP+Gnb7OEsP8KaZEss0Q0mAMX6SQZES0fdKuAvBZ44TCel69GoydSm7nN/g/AOL 34AwItSLvjwXWAMZkPO6PAETCp2OcsyDUhdQyKTBe9ozthsN5cdTCoDrknT5ZJIworBy 1eOyehByZJu6r+f0NEu04pXqWd/kxbKsdqG3o=

2010/6/7 Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>: > Hi, > > I tried to get rid of some of the MSVC warning since we are once again > hitting the 50 warnings limit and the dashboard is at its limits. ;) > > Well, by trying to do that, I stumbled over something strange in the > integer_types test. I seems natural that it generates a bunch of > warnings since in some cases we are negating unsigned values. First, I > was surprised that the test was anyways working It's just arithmetic modulo 2^N... the usual arithmetic rules are the same as for integers, and our integer_types tests are only based around such simple arithmetic rules, so the wrapping around doesn't make them fail :) But it's true that it's ugly, so, feel free to fix that. For example by isolating the tests that would emit warnings with unsigned types into separate functions... > and then I tried to > run it in debug mode and I got an unaligned memory assertion on > > m3 = m2; m3 *= s1; > VERIFY_IS_EQUAL(m3, s1*m2); > > while calling > > CALL_SUBTEST_1( integer_types(Matrix<unsigned long, 3, 4>()) ); > > I tried to reproduce this in a separate program but failed. Does > anybody have an idea? can you paste a backtrace from that assert? Does the assert persist if you replace unsigned long by signed long? Benoit > > - Hauke > > >

**Follow-Ups**:**Re: [eigen] integer types - something's odd...***From:*Hauke Heibel

**References**:**[eigen] integer types - something's odd...***From:*Hauke Heibel

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