IV41977: Suboptimal performance to 64-bit code

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • In 64 bit mode, run time performance was lost because the
    constant needs to be loaded from the constant area due to
    floating point registers (non-volatile) being used.
    

Local fix

  • N/A
    

Problem summary

  • PROBLEM DESCRIPTION: The compiler is using floating point store
    instruction to implement a memset function in 64-bit mode.
    This causes floating point registers to be used.
    
    USERS AFFECTED: Any user compiling a 64-bit program.
    

Problem conclusion

  • The issue is fixed. Apply provided service.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV41977

  • Reported component name

    XL C/C++ AIX

  • Reported component ID

    5724X1300

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-05-07

  • Closed date

    2013-08-13

  • Last modified date

    2013-08-13

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

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

    IV44283 LI77576 LI77654

Fix information

  • Fixed component name

    XL C FOR AIX

  • Fixed component ID

    5724X1200

Applicable component levels

  • RB10 PSY U860969

       UP C



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Document information


More support for:

XL C for AIX

Software version:

11.1

Reference #:

IV41977

Modified date:

2013-08-13

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