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PI74614: 'IF' STATEMENT BEING INCORRECTLY OPTIMIZED AWAY

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APAR status

  • Closed as program error.

Error description

  • When compiling a large program with complex flow with
optimization, the compiler incorrectly optimizes away an 'if'
statement causing the program to produce incorrect output at
runtime.

Local fix

  • N/A

Problem summary

  • ****************************************************************
* USERS AFFECTED: Users of XLC on zOS with large programs      *
*                 with complex control flow using              *
*                 optimization.                                *
****************************************************************
* PROBLEM DESCRIPTION: Optimization that guarantees            *
*                      correct order of instructions that      *
*                      modify condition code register value    *
*                      and those that consume this value,      *
*                      didn't run due to incorrect heuristics  *
*                      This caused incorrect program results   *
*                      at execution.                           *
****************************************************************
* RECOMMENDATION: Apply the provided PTF.                      *
*                                                              *
****************************************************************
.

Problem conclusion

  • Apply provided service.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PI74614
    • 

  • Reported component name
    C/C++ FOR MVS
    • 

  • Reported component ID
    56551210A
    • 

  • Reported release
    7A0
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2017-01-09
    • 

  • Closed date
    2017-01-09
    • 

  • Last modified date
    2017-02-01
    • 





    

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

    
PI74414
    

    • 

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

    • 



Modules/Macros


    

  •    CCNETBY

    



Fix information


    

  • Fixed component name
    C/C++ FOR MVS
    • 

  • Fixed component ID
    56551210A
    • 



Applicable component levels


    

  • R7A0  PSY  UI43767
       UP17/01/26  P  F701
    • 



Fix is available


    

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Document Information


            

            


                        

            Modified date:
            

            09 August 2024
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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