LI76133: INTERNAL COMPILER ERROR AT -O3

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

• An internal compiler error is encountered when the following
  test case is compiled at -O3 optimization.
  
  ===== Test case
  
  #include <math.h>
  
  extern int bar(void);
  
  struct MYS
  {
     int      *pdata;
     int      datalen;
  } statn;
  
  void foo(int flags)
  {
     int buf[1024], len;
     struct MYS mys;
  
     buf[0] = 0;
     mys = statn;
     len = mys.datalen;
     mys.pdata = buf;
  
  restart:
     while (bar())
     {
        if (flags)
           goto restart;
        if (floor(0.0))
           break;
     }
  }
  ======================
  

Local fix

• Use a lower optimization level when compiling.
  

Problem summary

• PROBLEM DESCRIPTION:
  An incorrect SSA graph is generated due to the inconsistency of
  the aliasing and a particular internal compiler flag.
  
  USERS AFFECTED:
  Users who optimize at -O3 or higher.
  

Problem conclusion

• This problem should be fixed.
  

Temporary fix

Comments

APAR Information

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

  IZ88804

• 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 IZ88804

     UP06/09/13