IV53301: LONG COMPILE TIME IN XLFENTRY AT -O2

XL Fortran for AIX Fix Pack 11 (May 2015 PTF) for 14.1
XL Fortran for AIX Fix Pack 12 (August 2015 Update) for 14.1
XL Fortran for AIX Fix Pack 15 (April 2016 Update) for 14.1
XL Fortran for AIX Fix Pack 16 (July 2016 Update) for 14.1
XL Fortran for AIX Fix Pack 17 (November 2016 Update) for 14.1
XL Fortran for AIX Fix Pack 18 (February 2017 Update) for 14.1
XL Fortran for AIX Fix Pack 19 (August 2017 Update) for 14.1
XL Fortran for AIX Fix Pack 6 (December 2013 PTF) for 14.1
XL Fortran for AIX Fix Pack 7 (March 2014 PTF) for 14.1
XL Fortran for AIX Fix Pack 8 (July 2014 PTF) for 14.1
XL Fortran for AIX Fix Pack 9 (October 2014 PTF) for 14.1
XL Fortran for AIX Fix Pack 10 (February 2015 PTF) for 14.1
XL Fortran for AIX Fix Pack 14 (December 2015 Update) for 14.1

APAR status

• Closed as program error.

Error description

• Compiling an application at optimization level -O2 has a drastic
  increase in compile time as compared to -O0.  The -qphsinfo
  compile timing report shows excess time spent in the FORTRAN
  stage of the compiler, which corresponds to the 'xlfentry'
  component of the compiler.
  

Local fix

• Compile at -O0
  

Problem summary

• PROBLEM DESCRIPTION:
  The Fortran component of the compiler may take a long time to
  compile at -O2 and above in cases where the compilation unit
  has a large number of I/O statements.
  
  USERS AFFECTED:
  Users may see this problem if their applications have a large
  number of I/O statements in individual compilation units.  The
  problem is visible at -O2 and above.
  

Problem conclusion

• An improvement has been made that reduces compile time when -O2
  or above is used.
  

Temporary fix

Comments

APAR Information

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

  LI77515

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

Fix information

• Fixed component name

  XL FORTRAN FOR

• Fixed component ID

  5725C7400

Applicable component levels