PH08709: 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 V6.2 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:

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

  PH10132 PH10711

Modules/Macros

• IGY8RWTU IGYCASMB IGYCCBE  IGYCCCRT 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 IGYCOB2  IGYCOB2E
  IGYCOPI  IGYCOPT  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
  IGYDRV   IGYEQCWI IGYMSGE  IGYMSGK  IGYMSGT  IGYQCBE  IGYZQDRV
  IGYZQENU IGYZQJPN
  

Fix information

• Fixed component name

  ENT COBOL FOR Z

• Fixed component ID

  5655EC600

Applicable component levels

• R620 PSY UI62019

     UP19/03/29 P F903

• R621 PSY UI62020

     UP19/03/29 P F903

• R622 PSY UI62021

     UP19/03/29 P F903

• R62H PSY UI62022

     UP19/03/29 P F903

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.