These tests contains two code flaws that may (and unfortunately do) cause
problems on 64-bit processors:

static int endlist = 0;  // should be explicitly NULL as 0 is a 32-bit integer

if(il->type == ICV_LONG ||
...                    
                                        val = (int*)il->val;
                                        val = (int*)*val;

// conversion from long to int loses bits on 64-bit processors

The same error also seems to be present in the Xlib14/sicvals/Test.{1-3} tests.

Found through LSB testing on a PowerPC 64 machine.