PI40940: RUNTIME PERFORMANCE DEGRADATION WHEN USING DYNAMIC_CAST CALL ANDLP64

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Runtime performance degradation when using dynamic_cast call
  and LP64. Users who uses dynamic_cast a lot or in hot paths are
  affected.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: zOS C/C++ compiler users who use             *
  *                 dynamic_cast in the 'ibm' object model       *
  ****************************************************************
  * PROBLEM DESCRIPTION: The dynamic_cast caching uses data      *
  *                      such as class type info as keys.        *
  *                      However, there are cases where this     *
  *                      info fails to differentiate.  As a      *
  *                      result, the caching mechanism gives     *
  *                      wrong results in such cases.            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• Apply provided service.
  

Temporary fix

Comments

APAR Information

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

  PM63646

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

  PI46446 UI30090

Modules/Macros

• CELHDCTI CELQDCTI CEL4DCTI CRTEC128 CRTEC64
  CRTE128N CRTHB017 CRTHB075 CRTIB017 CRTIB075
  

Fix information

• Fixed component name

  ANSI C++ CLASS

• Fixed component ID

  568819807

Applicable component levels

• R790 PSY UI30090

     UP15/08/26 P F508

Fix is available

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