IZ77626: ELIMINATION OF UNNECESSARY F90 ARRAY COPIES

September 2012 PTF for XL Fortran for AIX, V12.1
October 2010 PTF for XL Fortran for AIX, V12.1
February 2011 PTF for XL Fortran for AIX, V12.1
May 2011 PTF for XL Fortran for AIX, V12.1
July 2011 PTF for XL Fortran for AIX, V12.1
October 2011 PTF for XL Fortran for AIX, V12.1
February 2012 PTF for XL Fortran for AIX, V12.1
January 2013 PTF for XL Fortran for AIX, V12.1
XL Fortran for AIX Fix Pack 18 (July 2013) for 12.1
XL Fortran for AIX Fix Pack 19 (October 2013) for 12.1
XL Fortran for AIX Fix Pack 20 (October 2014 PTF) for 12.1

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:

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

  IZ77627 LI75747 LI75883 LI75889

Fix information

• Fixed component name

  XL FORTRAN AIX

• Fixed component ID

  5724U8200

Applicable component levels