IZ79954: INCORRECT RUNTIME OUTPUT

September 2010 PTF for XL Fortran for AIX, V13.1
January 2011 PTF for XL Fortran for AIX, V13.1
March 2011 PTF for XL Fortran for AIX, V13.1
August 2011 PTF for XL Fortran for AIX, V13.1
January 2012 PTF for XL Fortran for AIX, V13.1
April 2012 PTF for XL Fortran for AIX, V13.1
July 2012 PTF for XL Fortran for AIX, V13.1
October 2012 PTF for XL Fortran for AIX, V13.1
February 2013 PTF for XL Fortran for AIX, V13.1
May 2013 PTF for XL Fortran for AIX, V13.1
XL Fortran for AIX Fix Pack 15 (August 2013 PTF) for 13.1
XL Fortran for AIX Fix Pack 16 (November 2013 PTF) for 13.1
XL Fortran for AIX Fix Pack 17 (February 2014 PTF) for 13.1
XL Fortran for AIX Fix Pack 21 (April 2015 PTF) for 13.1
XL Fortran for AIX Fix Pack 22 (September 2015 PTF) for 13.1
XL Fortran for AIX Fix Pack 23 (March 2016 PTF) for 13.1
XL Fortran for AIX Fix Pack 24 (September 2016 PTF) for 13.1

APAR status

• Closed as program error.

Error description

• Output produced by source code that is compiled with version
  13.1 of the compiler is different than when the same source code
  is compiled using version 12.1 of the compiler.
  

Local fix

• N/A
  

Problem summary

• An optimization introduced in 13.1, relating to avoiding overly
  pessimistic compiler temporaries, was
  being applied incorrectly because a certain form of data
  conversion operator was obscuring a vector
  subscript operation. The vector subscript confused the
  optimization, resulting in a failure.
  

Problem conclusion

• During self-assignment optimization, the compiler now correctly
  detects and avoids optimizing the vector subscript.
  

Temporary fix

Comments

APAR Information

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

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

  LI75778

Fix information

• Fixed component name

  XL FORTRAN FOR

• Fixed component ID

  5724X1500

Applicable component levels

• RD10 PSY U839243

     UP A