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LI77575: INLINING CAUSING INCORRECT OUTPUT

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • ===== DESCRIPTION:
    The following test case produces an incorrect result when -O2 is
    used. Disabling inlining with -qnoinline
    avoids the issue.
    
    
    
    
    ========Testcase:
    $ cat test.cpp
    #include <cstdio>
    
    struct X {
    
      struct Y {
        int free() {
          x->y=NULL;
          return value;
        }
        int value;
        X* x;
      };
    
      int pop() {
        return y->free();
      }
      Y*y;
    };
    
    
    int main() {
      X x;
      X::Y y;
    
      y.x=&x;
      y.value=8200;
    
      x.y=&y;
    
      printf("%d\n", x.pop());
    }
    
    $
    
    
    
    
    ===== ACTUAL OUTPUT:
    $ xlC -O2 test.cpp
    $ ./a.out
    0
    $
    
    
    ===== EXPECTED OUTPUT:
    $ xlC -O2 test.cpp
    $ ./a.out
    8200
    $
    

Local fix

  • Use -qnoinline as a workaround.
    

Problem summary

  • TBD
    

Problem conclusion

  • TBD
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI77575

  • Reported component name

    XL C/C++ FOR LI

  • Reported component ID

    5725C7300

  • Reported release

    C10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-10-28

  • Closed date

    2013-10-28

  • Last modified date

    2013-10-28

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

    IV44221

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

Fix information

  • Fixed component name

    XL C/C++ FOR LI

  • Fixed component ID

    5725C7300

Applicable component levels

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSXVZZ","label":"XL C\/C++ for Linux"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"12.1","Line of Business":{"code":"LOB57","label":"Power"}}]

Document Information

Modified date:
13 October 2021