IV37088: INFINITE LOOP WITH -QSMP

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Compiling the following test case with -qsmp=omp will result in
    runtime application infinite loop for the do while statement.
    
    #include <stdio.h>
    int main ()
    { printf ("hello\n");
      unsigned char dividend = 0;
      do {
        printf ("dividend = %x\n", dividend);
      } while (++dividend);
      printf ("good bye\n");
      return 0;
    }
    
    xlc_r -qsmp=omp t.c
    
    ===== ACTUAL OUTPUT:
    Prints out dividend, iterating through the unsigned char hex
    values, non-stop and "good bye" is not printed out.
    .....
    dividend = fd
    dividend = fe
    dividend = ff
    .....
    
    ===== EXPECTED OUTPUT:
    .....
    dividend = fd
    dividend = fe
    dividend = ff
    good bye
    

Local fix

  • Use -qstrict_induction
    

Problem summary

  • PROBLEM DESCRIPTION: Integer overflow for loop induction
    variable causes incorrect output during loop normalization
    
    USERS AFFECTED: Users explicitly overflowing the loop induction
    variable at -O3, -qsmp, -qhot, -qpdf, or -qipa
    

Problem conclusion

  • Problem is fixed. Apply provided service.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV37088

  • Reported component name

    XL C/C++ AIX

  • Reported component ID

    5724X1300

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-02-21

  • Closed date

    2013-04-19

  • Last modified date

    2013-04-23

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

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

    IV44279 LI77645

Fix information

  • Fixed component name

    XL C FOR AIX

  • Fixed component ID

    5724X1200

Applicable component levels

  • RB10 PSY U859062

       UP C



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Document information


More support for:

XL C for AIX

Software version:

11.1

Reference #:

IV37088

Modified date:

2013-04-23

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