PI92326: COBOL PERFORMANCE DEGRADATION WITH OVERLAPPING MOVE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Execution time performance in module IGZXVMO can increase when
  using an overlapping MOVE statement.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of Enterprise COBOL V5 and later       *
  *                 releases compiling and running COBOL         *
  *                 programs that use overlapping MOVE to        *
  *                 initialize alphanumeric or group identifier. *
  ****************************************************************
  * PROBLEM DESCRIPTION: MOVE statements of the form below can   *
  *                      be inefficient.                         *
  *                                                              *
  *                        01 A PIC X(1000000).                  *
  *                                                              *
  *                        MOVE ' ' to A(1:1).                   *
  *                        MOVE A TO A(2:999999).                *
  *                                                              *
  *                      The overlapping sending and receiving   *
  *                      fields in the second MOVE statement     *
  *                      can restrict the generated code         *
  *                      sequences used by the compiler.         *
  ****************************************************************
  * RECOMMENDATION: Apply the provided PTF.                      *
  ****************************************************************
  MOVE with overlapping sending and receiving fields can be
  inefficient as the overlapping data can restrict the generated
  code sequences used by the compiler.
  
  FIXCAT keyword: COB0501T/K  COB0502T/K  COB0601T/K  COB0602
  

Problem conclusion

• Special processing has been put in to handle the MOVE statement
  described the Problem Description. In general COBOL programs
  should avoid using overlapping MOVE statements in order to get
  benefits from COBOL compiler optimizations.
  

Temporary fix

Comments

APAR Information

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

  PI92022

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

Modules/Macros

• IGZCEV4  IGZCMGEN IGZCMGUE IGZLLIBV IGZXAPI  IGZXCDA  IGZXD24
  IGZXDMR  IGZXLPIO IGZXLPKA IGZXLPKB IGZXLPKC IGZXLPKD IGZXLPKE
  IGZXLPKF IGZXLPKG IGZXPK2
  

Fix information

• Fixed component name

  LE ENT COBOL LI

• Fixed component ID

  568819812

Applicable component levels

• R7B0 PSY UI53199

     UP18/01/27 P F801

Fix is available

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