IBM Support

IV22789: MISSING ALIAS IN IPA/PDF BUILD

Fixes are available

August 2012 PTF for XL C for AIX, V12.1
August 2012 PTF for XL C/C++ for AIX, V12.1
November 2012 PTF for XL C for AIX, V12.1
November 2012 PTF for XL C/C++ for AIX, V12.1
March 2013 PTF for XL C for AIX, V12.1
March 2013 PTF for XL C/C++ for AIX, V12.1
XL C/C++ for AIX Fix Pack 4 (June 2013 PTF) for 12.1
XL C/C++ for AIX Fix Pack 5 (September 2013 PTF) for 12.1
XL C/C++ for AIX Fix Pack 7 (January 2014 PTF) for 12.1
XL C for AIX Fix Pack 8 (March 2014 PTF) for 12.1
XL C/C++ for AIX Fix Pack 8 (March 2014 PTF) for 12.1
XL C/C++ for AIX Fix Pack 11 (February 2015 PTF) for 12.1
XL C for AIX Fix Pack 12 (May 2015 PTF) for 12.1
XL C/C++ for AIX Fix Pack 12 (May 2015 PTF) for 12.1
XL C/C++ for AIX Fix Pack 13 (August 2015 Update) for 12.1
XL C/C++ for AIX Fix Pack 14 (December 2015 Update) for 12.1
XL C for AIX Fix Pack 15 (April 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 15 (April 2016 Update) for 12.1
XL C for AIX Fix Pack 16 (July 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 16 (July 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 17 (November 2016 Update) for 12.1
XL C for AIX Fix Pack 17 (November 2016 Update) for 12.1
XL C for AIX Fix Pack 18 (February 2017 Update) for 12.1
XL C/C++ for AIX Fix Pack 18 (February 2017 Update) for 12.1
XL C for AIX Fix Pack 19 (August 2017 Update) for 12.1
XL C/C++ for AIX Fix Pack 19 (August 2017 Update) for 12.1
XL C for AIX Fix Pack 20 (March 2018 Update) for 12.1
XL C/C++ for AIX Fix Pack 20 (March 2018 Update) for 12.1
XL C for AIX Fix Pack 4 (June 2013 PTF) for 12.1
XL C for AIX Fix Pack 5 (September 2013 PTF) for 12.1
XL C for AIX Fix Pack 6 (December 2013 PTF) for 12.1
XL C/C++ for AIX Fix Pack 6 (December 2013 PTF) for 12.1
XL C for AIX Fix Pack 7 (January 2014 PTF) for 12.1
XL C for AIX Fix Pack 9 (July 2014 PTF) for 12.1
XL C/C++ for AIX Fix Pack 9 (July 2014 PTF) for 12.1
XL C for AIX Fix Pack 10 (October 2014 PTF) for 12.1
XL C/C++ for AIX Fix Pack 10 (October 2014 PTF) for 12.1
XL C for AIX Fix Pack 11 (February 2015 PTF) for 12.1
XL C for AIX Fix Pack 13 (August 2015 Update) for 12.1
XL C for AIX Fix Pack 14 (December 2015 Update) for 12.1
XL C/C++ for AIX Fix Pack 21 (January 2019 Update) for 12.1
XL C for AIX Fix Pack 21 (January 2019 Update) for 12.1

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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

    IV22789

  • Reported component name

    XL C/C++ FOR AI

  • Reported component ID

    5725C7200

  • Reported release

    C10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-06-12

  • Closed date

    2012-08-03

  • Last modified date

    2012-08-03

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

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

    LI76959 LI77067

Fix information

  • Fixed component name

    XL C FOR AIX

  • Fixed component ID

    5725C7100

Applicable component levels



Document information

More support for: XL C for AIX
Compiler

Software version: 12.1

Reference #: IV22789

Modified date: 03 August 2012