IV23298: INTERNAL ERROR WITH -QSIMD

July 2012 PTF for XL C/C++ for AIX, V11.1
July 2012 PTF for XL C for AIX, V11.1
October 2012 PTF for XL C/C++ for AIX, V11.1
October 2012 PTF for XL C for AIX, V11.1
February 2013 PTF for XL C for AIX, V11.1
February 2013 PTF for XL C/C++ for AIX, V11.1
XL C/C++ for AIX Fix Pack 14 (May 2013 PTF) for 11.1
XL C for AIX Fix Pack 14 (May 2013 PTF) for 11.1

APAR status

• Closed as program error.

Error description

• When compiling the following test case with -qsimd, the compiler
  is encountering an internal compiler error:
  
     =====  TEST CASE  =====
  
  #include <stdint.h>
  
  int function(short *data, short *out, long index)
  {
    long i, tmp;
  
    tmp = index & 0xFFFFFFFFLL;
    if(data[tmp]==0) {
       return 0;
    }
    for (i=0; i<30; i++)
       out[i] = data[tmp];
    return tmp;
  }
  
  
  
  >  xlc -qarch=pwr7 -qhot -qsimd -q64 test.c
  ipa: simd_util.cpp:103: int log2_int(int):
     Assertion `x != 0' failed.
  Calling signal handler...
  1586-494 (U) INTERNAL COMPILER ERROR: Signal 6.
  xlc: 1501-230 (S) Internal compiler error; please contact your
  Service Representative. For more information visit:
  http://www.ibm.com/support/docview.wss?uid=swg21110810
  >
  

Local fix

• Do not use -qsimd
  

Problem summary

• PROBLEM DESCRIPTION:
  Integer overflow in the IPA SIMD compiler step when loading the
  constant 0xFFFFFFFF in the source program.
  
  USERS AFFECTED:
  Users on using -qsimd.
  

Problem conclusion

• The issue was corrected.
  

Temporary fix

Comments

APAR Information

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

  LI76802

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

Fix information

• Fixed component name

  XL C FOR AIX

• Fixed component ID

  5724X1200

Applicable component levels

• RB10 PSY U852940

     UP C