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LI77654: 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

    LI77654

  • Reported component name

    XL C/C++ FOR LI

  • Reported component ID

    5725C7300

  • Reported release

    C10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-10-28

  • Closed date

    2013-10-28

  • Last modified date

    2013-10-28

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

    IV41977

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

Fix information

  • Fixed component name

    XL C/C++ FOR LI

  • Fixed component ID

    5725C7300

Applicable component levels



Document information

More support for: XL C/C++ for Linux
Compiler

Software version: 12.1

Reference #: LI77654

Modified date: 28 October 2013