PH12015: The compiler generates incorrect code resulting in the comparison being incorrect.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• USERS AFFECTED: Users of Enterprise COBOL Vx.x compiling
  programs with NORENT that compare data items in fairly close
  proximity in WORKING-STORAGE.
  
  PROBLEM DESCRIPTION: The compiler generates incorrect code
  when computing the address of the second item being compared,
  resulting in the comparison being incorrect.
  
  RECOMMENDATION TO CUSTOMER: Apply the provided PTF.
  
  PROBLEM SUMMARY: For items in close proximity, the address
  computations might involve the same address multiple times. In
  generating code for this address, the compiler can choose to
  reuse an existing register or use a new one. If the common
  address was referenced at least once in the computation of the
  first data item's address and more than once in the computation
  of the second data item's address, the compiler might generate
  an instruction that reused a register as part of the second data
  item's computation, before the first data item's computation was
  complete, causing the first data item's computation to be
  incorrect.
  
  CONCLUSION: The compiler was fixed to never reuse a register in
  computing an address when that register was possibly still in
  use by another address computation.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of Enterprise COBOL V5.2 compiling     *
  *                 programs with NORENT that compare data       *
  *                 items in fairly close proximity in           *
  *                 WORKING-STORAGE.                             *
  ****************************************************************
  * PROBLEM DESCRIPTION: The compiler generates incorrect code   *
  *                      when computing the address of the       *
  *                      second item being compared, resulting   *
  *                      in the comparison being incorrect.      *
  ****************************************************************
  * RECOMMENDATION: Apply the provided PTF.                      *
  ****************************************************************
  For items in close proximity, the address computations might
  involve the same address multiple times. In generating code for
  this address, the compiler can choose to reuse an existing
  register or use a new one. If the common address was
  referenced at least once in the computation of the first data
  item's address and more than once in the computation of the
  second data item's address, the compiler might generate an
  instruction that reused a register as part of the second
  data item's computation,
  before the first data item's computation was complete, causing
  the first data item's computation to be incorrect.
  

Problem conclusion

• The compiler was fixed to never reuse a register in computing an
  address when that register was possibly still in use by another
  address computation.
  

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:

  PH13068 PH14172

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 UI63603

     UP19/06/18 P F906

• R521 PSY UI63604

     UP19/06/19 P F906

• R522 PSY UI63605

     UP19/06/19 P F906

Fix is available

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