An example code causing an internal error

test.cpp

#include <stdio.h>
typedef double v4df __attribute__((vector_size(32)));
typedef double v8df __attribute__((vector_size(64)));
template <class T>
void func(T r) {
  double *a = (double*)(&r);
  for(int i=0;i < sizeof(T)/sizeof(double);i++){
    printf("%.10f ",a[i]);
  }
  printf("\n");
}
int
main(void){
  v4df v4z;
  v8df v8z;
  func(v4z);
  func(v8z);
}

Try following options.

$ icpc -O1 test.cpp
$ icpc -O2 test.cpp