LI78428: COMPILER USES XVCPSGND INSTEAD OF XXLOR

XL C/C++ for Linux Fix Pack 2 (February 2015 Update) for 13.1

APAR status

• Closed as program error.

Error description

• For certain specific sequences of source code, the xlc compiler
  generates xvcpsgnd instructions instead of the xxlor instruction
  causing programs to be not as fast as they cab be.
  

Local fix

• N/A
  

Problem summary

• USERS AFFECTED:
  Those using -qarch/tune=pwr7 and higher; along with -O2 and
  higher maybe affected by this issue.
  
  PROBLEM DESCRIPTION:
  Less performance for register moves with -qarch/tune=pwr7 and
  up may be experienced.
  

Problem conclusion

• The compiler has been fixed to improve the instruction
  selection for vector register moves to improve performance.
  

Temporary fix

Comments

APAR Information

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

  IV57389

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

Fix information

• Fixed component name

  XL C/C++ FOR LI

• Fixed component ID

  5725C7300

Applicable component levels

• RD10 PSN IV57389

     UP06/09/13