LI76056: POSITION INDEPENDENT MASS ROUTINES

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

• The -qstrict=vectorprecision option is required to ensure that
  results are reproducible independent of the position of an
  element in an array.  Compiling with this options is effectively
  disabling vectorization of code by not generating calls to
  vectorized implementations of certain math functions, thus
  causing a performance hit.
  

Local fix

• N/A
  

Problem summary

• PROBLEM DESCRIPTION:
  Option -qstrict=vectorprecision incorrectly disables automatic
  vectorization (MASSV call generation) in the high level
  optimizer.
  
  USERS AFFECTED:
  Users of XL Fortran compiling with -qstrict=vectorprecision at
  -O3 opt level or higher
  

Problem conclusion

• The fix enables automatic optimization of code containing
  opportunities for MASSV vectorization when option
  -qstrict=vectorprecision is in effect. The high level compiler
  optimizer will generate MASSV calls when the generated call
  produces position independent results.
  

Temporary fix

Comments

APAR Information

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

  IZ87797

• 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 IZ87797

     UP06/09/13