memory alignment vs passing by value

I don't know about other platforms/compilers, but with MSVC, passing a 4
component floating point vector by value is far more efficient than passing
it as a reference (could anyone explain why this is the case btw?).

One more thing that can help performance is correct alignment in memory.
Problem is, when I my vectors are aligned, then I cannot pass by value
anymore, I'm forced to use reference.

These requirements knock each other out, so what can I do? :)

The interesting thing is that I can still create local variables on the
stack, and they will be correctly aligned, but it cannot align the passed
parameters? Why?


Thanks,


Andras




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