LI75134: OUT OF MEMORY AT -O4

October 2009 Update for XL C/C++ for Linux, V10.1
June 2011 Update for XL C/C++ for Linux, V10.1
XL C/C++ for Linux Fix Pack 8 (January 2014 Update) for 10.1
August 2010 Update for XL C/C++ for Linux, V10.1
January 2011 Update for XL C/C++ for Linux, V10.1
January 2012 Update for XL C/C++ for Linux, V10.1
July 2012 Update for XL C/C++ for Linux, V10.1

APAR status

• Closed as program error.

Error description

• When compiling a large application at -O4 or -O5, the compiler
  generated the following error:
  
  System error (12): There is not enough memory available now.
  1586-346 (U) An error occurred during code generation.  The code
  generation return code was 217.
  

Local fix

• Use -O3
  

Problem summary

• USER AFFECTED:
  Users using high level of optimization on a compilation unit
  with very
  large number of functions to compile. The number of functions
  could be
  due to large source file or use of complicated templates
  generating
  many templete instantiations.
  
  PROBLEM DESCRIPTION:
  The compiler is facing a huge input task and runs out of memory
  trying to keep the entire intermediate representation of the
  program.
  

Problem conclusion

• The initial sizes of tables for the intermediate representation
  of
  the program were more appropriately sized. The tables can grow
  but
  with better proportions of different tables, all the tables
  nowc grow
  with better increments leaving enough memory to complete
  compilation.
  

Temporary fix

Comments

APAR Information

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

  IZ59844

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

Fix information

• Fixed component name

  XL C/C++ SLES10

• Fixed component ID

  5724U8300

Applicable component levels

• RA10 PSY

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