LI75392: INCORRECT OUTPUT AT -O5

May 2010 Update for XL Fortran for Linux, V12.1
January 2012 Update for XL Fortran for Linux, V12.1
January 2011 Update for XL Fortran for Linux, V12.1
June 2011 Update for XL Fortran for Linux, V12.1
XL Fortran for Linux Fix Pack 8 (January 2014 Update) for 12.1

APAR status

• Closed as program error.

Error description

• An application compiled at -O5 and produced incorrect output at
  runtime. This issue only occurs on CELL platform.
  

Local fix

• Use -O3
  

Problem summary

• USER AFFECTED:
  Users who use HOT (loop) optimizations.
  
  PROBLEM DESCRIPTION:
  The compiler can generate incorrect code for loops where
  the induction variable bump is stored in a variable
  (i.e. it is not a literal in the source) and the variable
  happens to be negative at runtime.
  

Problem conclusion

• The compiler has now turned off loop denormalization
  in cases where the compiler can't prove that it's correct.
  The problem has been fixed.
  

Temporary fix

Comments

APAR Information

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

  LI74935

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

Fix information

• Fixed component name

  XL FORTRAN RHEL

• Fixed component ID

  5724U8410

Applicable component levels

• RC10 PSN LI74935

     UP06/09/13