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Problem Report 0071 Details

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Report 0071 Actions

    Problem Report Number 0071
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.0071
    Raised 1993-05-11 08:00
    Updated 2003-03-13 08:00
    Published 1993-06-02 08:00
    Product Standard Internationalised System Calls and Libraries (XPG4)
    Certification Program The Open Brand certification program
    Test Suite VSX4 version 4.2.4
    Test Identification ANSI.os/maths/exp 1
    Linked Problem Reports TSD4.048, (in, old, system)
    Problem Summary TSD4.071 The reason the test gives unacceptible results is as follows :- The ICL Series 39 hardwrae will generate an exception condition for either overflow or underflow. If the software is ignoring this excep...
    Problem Text
    The reason the test gives unacceptible results is as follows :-

    The ICL Series 39 hardwrae will generate an exception condition for either
    overflow or underflow. If the software is ignoring this exception
    condition (by ignoring SIGFPE) the result of the offending operation and hence
    subsequent operations is undefined.
    Test Output
    ************************************************************************
    /tset/ANSI.os/maths/exp/T.exp 1 Failed

    Test Description:
    exp() conforms to the equation exp(x+y) = exp(x)*exp(y) with
    acceptable accuracy, for x and y values in the interval
    log(MINDOUBLE)/2 to log(MAXDOUBLE)/2.
    Posix Ref: Component EXP Assertion 8.1-04(A)

    Test Strategy:
    CALCULATE floating point constants mlmachar().
    CREATE child
    REASSIGN stderr to /dev/null to avoid error output from maths
    functions.
    50 times
    INITIALISE global constants (low, high, iterations)
    TEST exp(x+y) = exp(x) + exp(y) for 40 random values in range
    -log(MINDOUBLE)/2 to log(MAXDOUBLE)/2.
    REPORT variance when 5 times greater than minimum using
    mlresults().

    Test Information:
    Random arguments were tested from the interval [-90.1091, 87.3365]
    The result was too large 369 times
    equal 373 times
    too small 1308 times
    The maximum relative error of 1 occured for values -79.7379, -85.4536
    This gave a maximum loss of 14 significant digits of base 16
    The maximum acceptable loss is 10 significant digits
    The root-mean-square relative error is 0.112619
    This gave an average loss of 13 significant digits of base 16
    The maximum acceptable loss is 5 significant digits
    ************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    This is an accepted test suite deficiency and a permanent waiver is recommended.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Test Suite Deficiency (TSD)
    Review Conclusion
    This is an agreed test suite deficiency.

    Problem Reporting System Options:

     

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