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IV44464: JAVA JIT X86-64: PROBLEM WITH ANALYSE ADD FOR LEA FOR LONG COMPU TATION

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APAR status

  • Closed as program error.

Error description

  • Error Message: Wrong result with some long arithmetic
.
Stack Trace: N/A
.
The problem can only occur on x86-64 (AMD and Intel CPUs)
running the 64bit JVM.

Local fix

  • Disable JIT compiling the one method where problem was found.
-Xjit:exclude={full_method_name}

Problem summary

  • The problem was an unanticipated condition in a new sequence
added for analyse add for LEA, where we tried to use a LEA
operation with 3 registers on 64bit, because the constant used
in the LEA expression couldn't be fit in 32bits.

Problem conclusion

  • This defect will be fixed in:
7.0.0 SR5
6.0.1 SR6
6.0.0 SR14
5.0.0 SR16 FP3

.
The code was modified and to reject using an LEA instruction for
this situation.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV44464
    • 

  • Reported component name
    JAVA 5 JIT
    • 

  • Reported component ID
    620500124
    • 

  • Reported release
    500
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2013-06-18
    • 

  • Closed date
    2013-06-18
    • 

  • Last modified date
    2013-06-18
    • 





    

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

    
IV44174
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    JAVA 5 JIT
    • 

  • Fixed component ID
    620500124
    • 



Applicable component levels


    

  • R500  PSN
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            18 June 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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