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MOVQ Intrinsic?

I have a bit of code that needs to store the low 8 bytes of an SSE register to an arbitrarily-aligned address. MOVQ looks like the right instruction for this, but it doesn't appear to have a built-in intrinsic. Apple's documentation states:

"SSE provides a rich set of scalar loads and stores. MOVQ and MOVD can be used to move 8- and 4-byte integers to and from the low element on the XMM vector."

but gives no hint how to code this with intrinsics. In other words, my function is:

// ____ store low 8 bytes of v to unaligned address p
void Store64(char* p, vSInt8 v); 

How do I code this?

Thanks,
Ben
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