We have already mentioned above a number of architectural differences that affect porting of codes containing Intel intrinsics to POWER. The fact that Intel supports multiple vector extensions with different vector widths (64, 128, 256, and 512 bits) while the PowerISA only supports vectors of 128 bits is one issue. Another is the difference in how the respective ISAs support scalars in vector registers.  In the text above we propose workable alternatives for the PowerPC port. There are also differences in the handling of floating point exceptions and rounding modes that may impact the application's performance or behavior.