[Mono-dev] MonoTests.System.MathTest.TestIEEERemainder fails in Solaris 7 sparc

nataraj.ramaswamy at wipro.com nataraj.ramaswamy at wipro.com
Mon Jun 2 09:11:50 EDT 2008

We have been able to successfully build Mono on Solaris 7 sparc (32
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
  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

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 where it gets into (!IsLittleEndian) which fills
the value in the big endian (reverse) order whereas Int64BitsToDouble
uses ToDouble() which doesnot have this conversion based on endianness
We would like to know your valuable inputs on how to fix this issue for
Solaris 7 sparc.
Please let us know whether it would be a right fix to use
Int64BitsToDouble instead of InternalInt64BitsToDouble (conditionally
built for Solaris 7 sparc). 
Thanks & regards,

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