PI90580: On DIVIDE with REMAINDER, optimizer applies incorrect constraints to remainder, possible incorrect code elimination

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The optimizer incorrectly reuses the constraints on the dividend
  for the remainder, which can lead to the incorrect elimination
  of subsequent code involving the remainder.
  

Local fix

• Use OPT(0)
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of Enterprise COBOL 6.2 compiling and  *
  *                 running programs at OPT(1|2) with            *
  *                 DIVIDE...GIVING REMAINDER statements where   *
  *                 the dividend has minimum value N and code    *
  *                 following the DIVIDE checks if the           *
  *                 remainder is either less than N or greater   *
  *                 remainder is either less than N or greater   *
  *                 than N.                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Incorrect output at runtime: The        *
  *                      compiler incorrectly removes the check  *
  *                      that the remainder is less than N or    *
  *                      greater than N following the DIVIDE     *
  *                      statement.                              *
  ****************************************************************
  * RECOMMENDATION: Apply the provided PTF.                      *
  ****************************************************************
  The compiler assumes the remainder has the range of the
  dividend, which causes the compiler to remove the check that
  the remainder is less than N or greater than N following the
  DIVIDE statement.
  

Problem conclusion

• The compiler was fixed to correctly set the range of values for
  the remainder, causing it to correctly recognize that the check
  for the remainder being less than N or greater than N couldn't
  be safely removed.
  

Temporary fix

Comments

APAR Information

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

  PI85297

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

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  IGYCOPI
  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  IGYSIDEK IGYZQDRV
  

Fix information

• Fixed component name

  ENT COBOL FOR Z

• Fixed component ID

  5655EC600

Applicable component levels

• R620 PSY UP

     A

• R621 PSY UP

     A

• R622 PSY UI62021

     UP19/03/29 P F903

• R62H PSY UP

     A

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.