LI75747: ELIMINATION OF UNNECESSARY F90 ARRAY COPIES

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

• An issue with elimination of unnecessary F90 array copies.  The
  compiler is adding superfluous array copies that is causing
  performance slow-down.
  

Local fix

• N/A
  

Problem summary

• PROBLEM DESCRIPTION:
  When users associate a contiguous array section with an
  explicit shape dummy argument that has intent(in) or
  intent(inout), the compiler generates an unnecessary temporary
  which causes a performance degradation
  
  USERS AFFECTED:
  Users that associate contiguous array sections with an explicit
  shape dummy argument that has intent(in) or intent(inout).
  

Problem conclusion

• Corrected the issue that prevented the contiguity check from
  identifying the array section as a contiguous piece of memory.
  

Temporary fix

Comments

APAR Information

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

  IZ77626

• 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 IZ77626

     UP06/09/13