PM95249: LOG() FUNCTION MAY RETURN INCORRECT RESULTS

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • log() function may return incorrect results at the ninth decimal
    place on z/OS. The results are not aligned with the IEEE-754
    standard and may be an issue for programs that rely on a high
    degree of precision in their calculations.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: Language Environment applications that       *
    *                 use the C/C++ run-time IEEE floating         *
    *                 point log() function.                        *
    ****************************************************************
    * PROBLEM DESCRIPTION: The IEEE floating point log() function  *
    *                      does not provide the correct level of   *
    *                      precision.                              *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    

Problem conclusion

  • Code has been modified to correct this problem.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM95249

  • Reported component name

    LE FOR MVS & VM

  • Reported component ID

    568819801

  • Reported release

    780

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-08-16

  • Closed date

    2013-10-10

  • Last modified date

    2013-11-04

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    UK98377 UK98376

Modules/Macros

  •    CELHFLOG CELQFLOG CEL4FLOG
    

Fix information

  • Fixed component name

    LE C LIBRARY

  • Fixed component ID

    568819805

Applicable component levels

  • R770 PSY UK98376

       UP13/10/23 P F310

  • R780 PSY UK98377

       UP13/10/23 P F310

Fix is available

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Document information


More support for:

z/OS XL C/C++
Runtime

Software version:

780

Operating system(s):

MVS, z/OS

Reference #:

PM95249

Modified date:

2013-11-04

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