error: class "__m128" has no suitable assignment operator

This code 

#include <xmmintrin.h>

volatile __m128 a, b;

void test(void)

{

     a = b;

}

produces this error

$ /opt/intel/composerxe/bin/icpc -c test.cc

test.cc(7): error: class "__m128" has no suitable assignment operator

       a = b;

           ^

compilation aborted for test.cc (code 2)

when compiled with icpc.  There is no error if the variables are not volatile.  There is no error with icc or gcc or g++.

Any suggestion on how to compile it with icpc?