LI76885: INTERNAL COMPILER ERROR IN XLCENTRY AT -O0

November 2012 Update for XL C/C++ for Blue Gene/Q, V12.1
February 2013 Update for XL C/C++ for Blue Gene/Q, V12.1

APAR status

• Closed as program error.

Error description

• The compiler frontend (xlCentry) produces and internal compiler
  error when compiling the following test case at -O0.
  
  It works fine at -O2 or higher.
  
  
  ===== COMPILE COMMAND:
  bgxlC -c test.cpp -O0
  
  
  ===== TEST CASE:
  $ cat test.cpp
  struct A{
    _Complex double& operator()(int, int);
  };
  
  void f()
  {
     A a;
    ~a(0, 0);
  }
  $
  
  
  ===== ACTUAL OUTPUT:
  $ bgxlC -c test.cpp -O0
  /opt/ibmcmp/vacpp/bg/12.1/bin/.orig/bgxlC: 1501-230 (S) Internal
  compiler error; please contact your Service Representative. For
  more information visit:
  http://www.ibm.com/support/docview.wss?uid=swg21110810
  $
  
  
  ===== EXPECTED OUTPUT:
  Should compile clean without an internal compiler error.
  

Local fix

• n/a
  

Problem summary

• USERS AFFECTED:
  Users of complex operations who use references and optimization
  are affected by this issue.
  
  PROBLEM DESCRIPTION:
  The complex conjugate operator is not correctly processed when
  the operand is a C++ reference,
  which leads to an incorrect optimization that result in a
  compiler failure during code generation.
  Minimal TC:
  
  _Complex double& foo();
  void f() { ~foo(); }
  

Problem conclusion

• The solution is to have the front-end correctly process
  references in the conjugate operator.
  

Temporary fix

Comments

APAR Information

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

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

  IV31738 LI77141

Fix information

• Fixed component name

  XL C/C++ FOR BG

• Fixed component ID

  5799AG100

Applicable component levels

• RC10 PSY

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