LI76823: INVALID OUTPUT AT -O2, -O3, -O4 IN 64-BIT MODE

XL C/C++ for Linux Fix Pack 9 (August 2013 Update) for 11.1
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

• The compiler issues incorrect output with the following testcase
  while using optimization (-O2, -O3 or -O4) in 64-bit mode (-q64)
  at compile time.
  
  /***********************    testcase    **********************/
  void main ()  {
  int i,bufL;
  char *memptr = "Hello";
  char *p = memptr;
  
     for (i=1; i <= 2; i++) {
           if (memptr != p)
              printf("WRONG: memptr=0x%lx != p=0x%lx\n",memptr,p);
           bufL = p-memptr;
           memptr += bufL;
        }
  }
  /**************************************************************/
  

Local fix

• Use noopt or -O5 at compile time.
  

Problem summary

• Failed to sign extend 32-bit signed value in 64-bit mode
  

Problem conclusion

• The problem had been fixed.
  

Temporary fix

Comments

APAR Information

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

  IV14903

• 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 IV14903

     UP06/09/13