[Mono-dev] System.MathTest.TestIEEERemainder fails

[nataraj.ramaswamy at wipro.com]

Hi Zoltan,
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.

Thanks & regards,
Nataraj


-----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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