[Mono-dev] System.MathTest.TestIEEERemainder fails

[Andreas Färber]

Hi,

Am 10.06.2008 um 13:22 schrieb <nataraj.ramaswamy at wipro.com> <nataraj.ramaswamy at wipro.com 
 >:

> Thanks for the immediate response. It would be really helpful if there
> are any links/references to recent test results for Sparc (version  
> 1.9).
> Or in other words, is there a possibility to know the list of test
> failures, known issues on Sparc.

The Wiki page lists one known test failure for Solaris/sparc iirc.  
(mono-project.com appears to be down currently from here)

Apart from that, the usual procedure when something is broken is to  
file a bug in Bugzilla, and if you've already fixed it, please also  
attach the patch you propose rather than just describing it.

Andreas

>
> -----Original Message-----
> From: Zoltan Varga [mailto:vargaz at gmail.com]
> Sent: Tuesday, June 10, 2008 4:20 PM
> To: Nataraj Ramaswamy (WT01 - Computing, Storage & Software Products)
> Cc: mono-devel-list at lists.ximian.com
> Subject: Re: [Mono-dev] System.MathTest.TestIEEERemainder fails
>
> Hi,
>
> This is now fixed in SVN using your suggestion. Btw, some of our tests
> do fail on sparc, this is not a problem for most applications tough.
>
>                               Zoltan
>
> 2008/6/10  <nataraj.ramaswamy at wipro.com>:
>> Hi,
>> We have been able to successfully build Mono on Solaris 7 sparc (32
> bit).
>>
>> When we tried to execute the Class Library test suites, some of the
>> test cases were failing.
>>
>> We need your expert inputs/suggestions on the following failure:
>>
>> Under mcs/class/corlib, MonoTests.System.MathTest.TestIEEERemainder
>> fails with the error message:
>> Negative Dividend expected:<-9223372036854775808>  but was:<128>
>>  at MonoTests.System.MathTest.TestIEEERemainder () [0x000bf] in
>> /mono_sol7/mono-1.9/mcs/class/corlib/Test/System/MathTest.cs:414
>>  at (wrapper managed-to-native)
>> System.Reflection.MonoMethod:InternalInvoke
>> (object,object[])
>>  at System.Reflection.MonoMethod.Invoke (System.Object obj,
>> BindingFlags invokeAttr, System.Reflection.Binder binder,
>> System.Object[] parameters, System.Globalization.CultureInfo culture)
>> [0x0003f] in
>> /mono_sol7/mono-1.9/mcs/class/corlib/System.Reflection/ 
>> MonoMethod.cs:1
>> 49
>>
>> On analysing further, it is observed that:
>> - In System/Math.cs, IEEERemainder uses InternalInt64BitsToDouble.
>> Changing this to Int64BitsToDouble gave the expected result and the
> test case passed.
>> - InternalInt64BitsToDouble() uses SwappableToDouble() under
>> System/BitConverter.cs . Here it gets into (!IsLittleEndian) which
>> fills the value in the big endian (reverse) order whereas
>> Int64BitsToDouble uses
>> ToDouble() which doesnot  perform this conversion based on endianness
>> (!IsLittleEndian).
>>
>> We would like to know your valuable inputs on how to  address this
>> issue for Solaris 7 sparc.
>> Please let us know whether it would be  correct to use
>> Int64BitsToDouble instead of InternalInt64BitsToDouble (conditionally
>> built for Solaris 7 sparc).
>>
>> Thanks & regards,
>> Nataraj
>>
>>
>>
>>
>>
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