IBM Support

IV44174: 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

    IV44174

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-06-12

  • Closed date

    2013-06-12

  • Last modified date

    2013-06-18

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

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

    IV44464

Fix information

  • Fixed component name

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R260 PSY

       UP



Document information

More support for: Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version: 260

Reference #: IV44174

Modified date: 18 June 2013