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IV59391: INCORRECT RESULT COMPARING WITH NAN VALUES ON SYSTEM Z

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APAR status

  • Closed as program error.

Error description

  • Error Message: A float or double comparison in which one or
both of the operands is NaN returns an incorrect result.
This only affects JIT-compiled Java code on System z.
.
Stack Trace: N/A
.

Local fix

  • 



Problem summary


    

  • The problem is caused when the JIT compiler optimizes
conditional code paths involving floating-point comparisons,
and generates incorrect condition code masks in the comparison
instructions.

    



Problem conclusion


    

  • This APAR will be fixed in the following Java Releases:
   6 R1 SR8       (6.1.8.0)
   7 R1 SR1       (7.1.1.0)
.
The JIT compiler has been updated to ensure proper results from
comparisons when NaNs are present.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV59391
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    260
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2014-04-17
    • 

  • Closed date
    2014-04-17
    • 

  • Last modified date
    2014-11-27
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    JIT
    • 

  • Fixed component ID
    620700124
    • 



Applicable component levels


    

  • R260  PSY
       UP
    • 

  • R130  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            27 November 2014
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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