LI75778: INCORRECT RUNTIME OUTPUT

November 2010 Update for XL Fortran for Linux, V13.1
April 2011 Update for XL Fortran for Linux, V13.1
July 2011 Update for XL Fortran for Linux, V13.1
October 2011 Update for XL Fortran for Linux, V13.1
June 2012 Update for XL Fortran for Linux, V13.1
October 2012 Update for XL Fortran for Linux, V13.1
XL Fortran for Linux Fix Pack 8 (June 2013 Update) 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:

  IZ79954

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

Fix information

• Fixed component name

  XL FORTRAN LINU

• Fixed component ID

  5724X1600

Applicable component levels

• RD10 PSN IZ79954

     UP06/09/13