LI76142: CLASS INSTANCE COPY ISSUE WITH OPENMP

XL C/C++ for Linux Fix Pack 9 (August 2013 Update) for 11.1
April 2011 Update for XL C/C++ for Linux, V11.1
July 2011 Update for XL C/C++ for Linux, V11.1
October 2011 Update for XL C/C++ for Linux, V11.1
June 2012 Update for XL C/C++ for Linux, V11.1
October 2012 Update for XL C/C++ for Linux, V11.1
XL C/C++ for Linux Fix Pack 8 (June 2013 Update) for 11.1

APAR status

• Closed as program error.

Error description

• When running the following OpenMP test case, the application is
  giving incorrect output.
  
  
     ===== TEST CASE =====
  
  #include <cstdio>
  #include <omp.h>
  #include <algorithm>
  
  using namespace std;
  
  std::pair< double, double >
  getData(int a, int b, double c)
  {
          std::pair< double, double > tmpCritV;
          tmpCritV.first = (double)a / (double)b + c;
          tmpCritV.second = (double)b / (double)a + c;
  
          return tmpCritV;
  }
  
  int main(int argc, char* argv[])
  {
  
    #pragma omp parallel
      printf("Hello, world. I'm thread %d\n",
       omp_get_thread_num());
    printf("========================\n");
  
    std::pair< double, double > tmpCritV;
  
    #pragma omp parallel for private (tmpCritV)
    for (int i = 0; i < 100; i++){
  
    if( i != 9 )
          continue;
  
    tmpCritV = getData(5, 8, 1.0);
  
    printf("%f, %f\n", tmpCritV.first, tmpCritV.second);
  
    }
  
    return 0;
  }
  
  
     ===== ACTUAL OUTPUT =====
  
  Hello, world. I'm thread 0
  ========================
  0.000000, 0.000000
  
  
     ===== EXPECTED OUTPUT =====
  
  Hello, world. I'm thread 0
  Hello, world. I'm thread 1
  Hello, world. I'm thread 2
  Hello, world. I'm thread 3
  Hello, world. I'm thread 4
  Hello, world. I'm thread 5
  Hello, world. I'm thread 6
  Hello, world. I'm thread 7
  ========================
  1.625000, 2.600000
  

Local fix

• N/A
  

Problem summary

• PROBLEM DESCRIPTION:
  The problem occurs due to copy propagation for an aggrate (and
  creating new member symbols) after the compiler has privatized
  the members of the aggregate.  As a result, the new member
  symbols are not privatized.
  
  USERS AFFECTED:
  Potentially any OpenMP users who privatize a structure (this
  can occur implicitly in C++).
  

Problem conclusion

• A check was added to avoid copy propagation that will create a
  member.
  

Temporary fix

Comments

APAR Information

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

  IZ89653

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

Fix information

• Fixed component name

  XL C/C++ FOR LI

• Fixed component ID

  5724X1400

Applicable component levels

• RB10 PSN IZ89653

     UP06/09/13