LI77513: INEFFICIENT CODE FOR 64-BIT VEC_CMPGT

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Sub-optimal code is generated for vec_cmpgt built-in for long
    long input.
    

Local fix

  • N/A
    

Problem summary

  • PROBLEM DESCRIPTION:
    For the vec_cmpgt vector built-in function, when used with
    signed long long values, if the first operand is zero, it is
    not necessary to check both first and second words of each
    element.
    
    USERS AFFECTED:
    Users using the vector built-in functions vec_cmpgt/vec_cmplt
    when compared with a zero vector.
    

Problem conclusion

  • When the first operand of vcmpgtsd is vector zero, the compiler
    will only compare the first word of each element.
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI77513

  • Reported component name

    XL C/C++ FOR BG

  • Reported component ID

    5799AG100

  • Reported release

    C10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-09-11

  • Closed date

    2013-09-11

  • Last modified date

    2013-09-11

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

    IV40035

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

Fix information

  • Fixed component name

    XL C/C++ FOR BG

  • Fixed component ID

    5799AG100

Applicable component levels

  • RC10 PSY

       UP



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Document information


More support for:

XL C/C++ for Blue Gene/Q
Compiler

Software version:

12.1

Reference #:

LI77513

Modified date:

2013-09-11

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