PH10132: THE OUTER PERFORM MAY INCORRECTLY RETURN TO THE WRONG LOCATION.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• USERS AFFECTED: Users of Enterprise COBOL Vx.x compiling
  programs at OPT(1|2) with a PERFORM UNTIL statement that
  checks several conditions, where at least two of the
  conditions compare pairs of data items that are sequential
  in memory, the paragraph being PERFORMed is PERFORMed from
  at least two PERFORM statements, and the paragraph being
  PERFORMed ends with another PERFORM statement.
  
  PROBLEM SUMMARY: The optimizer was combining the sequential
  comparisons for the PERFORM UNTIL test into one larger compare,
  invalidating the compiler's internal state about which
  PERFORMed paragraphs could return to which PERFORM statements,
  causing the compiler to incorrectly conclude that one of the
  return points wouldn't be reached.
  
  CONCLUSION: The optimizer was fixed to not combine
  sequential comparisons when they were part of a
  PERFORM UNTIL statement.
  

Local fix

• Compile at OPT(0)
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of Enterprise COBOL V5.2 compiling     *
  *                 programs at OPT(1|2) with a PERFORM UNTIL    *
  *                 statement that checks several conditions,    *
  *                 where at least two of the conditions         *
  *                 compare pairs of data items that are         *
  *                 sequential in memory, the paragraph being    *
  *                 PERFORMed is PERFORMed from at least two     *
  *                 PERFORM statements, and the paragraph being  *
  *                 PERFORMed ends with another PERFORM          *
  *                 statement.                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: The outer PERFORM may incorrectly       *
  *                      return to the wrong location.           *
  ****************************************************************
  * RECOMMENDATION: Apply the provided PTF.                      *
  ****************************************************************
  The optimizer was combining the sequential comparisons for the
  PERFORM UNTIL test into one larger compare, invalidating the
  compiler's internal state about which PERFORMed paragraphs
  could return to which PERFORM statements, causing the compiler
  to incorrectly conclude that one of the return points wouldn't
  be reached.
  

Problem conclusion

• The optimizer was fixed to not combine sequential comparisons
  when they were part of a PERFORM UNTIL statement.
  

Temporary fix

Comments

APAR Information

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

  PH08709

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

Modules/Macros

• IGY8RWTU IGYCBE   IGYCCBE  IGYCCICS IGYCCSRV IGYCDGEN IGYCDIAG
  IGYCDMAP IGYCEN$0 IGYCEN$1 IGYCEN$2 IGYCEN$3 IGYCEN$4 IGYCEN$5
  IGYCEN$8 IGYCEN$D IGYCEN$R IGYCFGEN IGYCFREE IGYCINIT IGYCJA$0
  IGYCJA$1 IGYCJA$2 IGYCJA$3 IGYCJA$4 IGYCJA$5 IGYCJA$8 IGYCJA$D
  IGYCJA$R IGYCLIBH IGYCLIBO IGYCLIBR IGYCLSTR IGYCLVL0 IGYCLVL1
  IGYCLVL2 IGYCLVL3 IGYCLVL8 IGYCMALL IGYCOSCN IGYCPGEN IGYCRCTL
  IGYCRDPR IGYCRDSC IGYCREAL IGYCRWT  IGYCSCAN IGYCSIMD IGYCUE$0
  IGYCUE$1 IGYCUE$2 IGYCUE$3 IGYCUE$4 IGYCUE$5 IGYCUE$8 IGYCUE$D
  IGYCUE$R IGYCXREF IGYECWI  IGYMSGE  IGYMSGK  IGYMSGT
  

Fix information

• Fixed component name

  ENT COBOL FOR Z

• Fixed component ID

  5655W3200

Applicable component levels

• R520 PSY UI62431

     UP19/04/12 P F904

• R521 PSY UI62432

     UP19/04/12 P F904

• R522 PSY UI62433

     UP19/04/12 P F904

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.