Which XMM are safe to erase in asm{} blocks?

[ponce via Digitalmars-d-learn]

What registers can I safely modify in asm {} blocks? Especially 
XMM registers.

I can't find the information on http://dlang.org/iasm.html
Note that this question isn't for function-call boundaries but 
asm{} boundaries since I do not use "naked;"