RFR (S): 7174532: jdk/test/java/lang/Math/WorstCaseTests.java failing on x86

Roland Westrelin roland.westrelin at oracle.com
Thu Jun 7 10:01:41 PDT 2012

>> Could you rename verify_ctw() to verify_fpu_ctw() since there are other control
>> words. Could you explain why it is only problem in VM 32-bit and add comment?
> It's 32bit only because on 64 bit the fpu cw it set to extended precision (it seems to be the default for the process?). Do we want to extend verify_fpu_ctw() so it checks the control world on 64 bit as well? It's not checked anywhere else even though I think, in other places than exp and pow, we make assumptions about the control word on 64 bit (that uses the fpu won't trigger exceptions for instance).

It's not that simple. We had the failure on windows-x64 (but not solaris-x64 or linux-x64). So something needs to be done on 64 bit as well.


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