LI77067: MISSING ALIAS IN IPA/PDF BUILD

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • When compiling a large application with ipa/pdf, the resulting
    exe had missing aliasing information leading to incorrect
    output.
    
    It is narrowned down to this sequence of
    code:
    
      816:      L1Z
    gr1504=#BIT_@2OLshd.pbrudi9D<id804:d0:l1>(gr1501,0)
    2951,49726,49704
        0:      DIRCTIV   issue_cycle,6,1009
    49726,56279,2951
        0:      DIRCTIV   issue_cycle,5,1
    56279,2948,49726
      813:      L8
    *gr1503=(__uAB_TYPE).pbagXXX@0.rns95.(gr3,0)    2948,2949,56279
      813:      ST8       @2OLshd.pbrudi9D(gr1501,0)=gr1503
    2949,2950,2948
    
    the first and last instructions have been reordered by the
    scheduler but they have the same address. These two dr's are not
    aliased.
    

Local fix

  • n/a
    

Problem summary

  • USERS AFFECTED:
    Users of IPA at -O4 and above may be affected by this issue.
    
    PROBLEM DESCRIPTION:
    The issue is that the compiler generates missing aliasing
    information with IPA/PDF.
    

Problem conclusion

  • The compiler generates correct aliasing information needed for
    IPA outlining.
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI77067

  • 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

    2012-11-23

  • Closed date

    2012-11-23

  • Last modified date

    2012-11-23

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

    IV22789

  • 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



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Document information


More support for:

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

Software version:

12.1

Reference #:

LI77067

Modified date:

2012-11-23

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