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Problem Report 2362 Details

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Report 2362 Actions

    Problem Report Number 2362
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.1220
    Raised 2004-04-21 01:46
    Updated 2004-04-30 14:26
    Published 2004-04-30 14:26
    Product Standard Internationalised System Calls and Libraries Extended V3 (UNIX 03)
    Certification Program The Open Brand certification program
    Test Suite VSU version 5.2.5
    Test Identification CAPI.os/maths/scalb 8, 9
    Specification Base Definitions Issue 6
    Linked Problem Reports 2355
    Problem Summary scalb tests 8c and 9c testing functionality of scalb which is not
    specified.
    Problem Text CAPI.os/maths/scalb tests 8c and 9c which is not specified by SUSv2 or
    SUSv3.

    These tests exercises a corner case of scalb(x, n) when n is
    non-integral. We return NaN as long as n is non-integral, yet the test
    expects +/-Inf as long as x is +/-Inf and n is not -Inf.

    From the specification:

    The scalb() function shall compute x*r^n, where r is the radix of
    the machine's floating-point arithmetic. When r is 2, scalb() shall
    be equivalent to ldexp() .

    If the second floating-point input argument n is non-integral,
    scalb(x, n) cannot possibly be equivalent to ldexp(x, i) because ldexp()
    takes as its second argument an int.

    Also from the specification:

    APPLICATION USAGE

    IEEE Std 1003.1-2001 only defines the behavior for the scalb()
    function when the n argument is an integer, a NaN, or Inf. The
    behavior of other values for the n argument is unspecified.
    Test Output
    ****************************************************************************************************************
    /tset/CAPI.os/maths/scalb/T.scalb 8 Failed

    Test Description:
    Base Conditional Conformance
    If the implementation supports Inf:
    A call to double scalb(double x, double n) when x is +Inf shall
    return
    x.

    Test Information:
    PREP: Check for Inf support
    PREP: Get VSU_SUPPORTS_INFINITY configuration variable
    TEST: scalb() returns correct value
    ERROR: scalb() incorrect
    Expected Infinity, Received nan


    ****************************************************************************************************************


    ****************************************************************************************************************
    /tset/CAPI.os/maths/scalb/T.scalb 9 Failed

    Test Description:
    Base Conditional Conformance
    If the implementation supports Inf:
    A call to double scalb(double x, double n) when x is -Inf shall
    return
    x.

    Test Information:
    PREP: Check for Inf support
    PREP: Get VSU_SUPPORTS_INFINITY configuration variable
    TEST: scalb() returns correct value
    ERROR: scalb(inf, n) incorrect:
    Expected -Infinity, Received nan


    ****************************************************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date 2004-04-21 01:46
    Last Updated 2004-04-21 18:59
    Completed 2004-04-21 18:59
    Status Complete
    Review Recommendation Test Suite Deficiency (TSD)
    Review Response This is accepted as a fault in the test suite.

    Review Type SA Review
    Start Date 2004-04-21 17:59
    Last Updated 2004-04-28 01:04
    Completed 2004-04-28 01:04
    Status Complete
    Review Resolution Test Suite Deficiency (TSD)
    Review Conclusion This PR represents and agreed test suite deficiency

    Problem Reporting System Options:

     

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