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PM95249: LOG() FUNCTION MAY RETURN INCORRECT RESULTS

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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 / Xsystem
    • 

  • 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


            

            


                        

            Modified date:
            

            04 November 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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