LI76636: __FENCE NOT BLOCKING MC_FUNC INLINE

XL C/C++ for Linux Fix Pack 9 (August 2013 Update) for 11.1
June 2012 Update for XL C/C++ for Linux, V11.1
October 2012 Update for XL C/C++ for Linux, V11.1
XL C/C++ for Linux Fix Pack 8 (June 2013 Update) for 11.1

APAR status

• Closed as program error.

Error description

• The compiler is not recognizing the code reordering optimization
  barrier __fence when attempting to protect against code movement
  of a #pragma mc_func function.  This is causing the mc_func
  function to be inlined in more places than expected.
  

Local fix

• Compiler without optimization.
  

Problem summary

• PROBLEM DESCRIPTION:
  At -O, a very large '#pragma mc_func' function was replicated
  into five predecessor blocks, despite a __fence().
  
  USERS AFFECTED:
  Those using very large mc_func machine code functions.
  

Problem conclusion

• mc_func functions of more than 3 instructions will not normally
  be replicated
  

Temporary fix

Comments

APAR Information

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

  IV11119

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

Fix information

• Fixed component name

  XL C/C++ FOR LI

• Fixed component ID

  5724X1400

Applicable component levels

• RB10 PSN IV11119

     UP06/09/13