Are register values preserved between function calls on amd64?  I'm pretty sure
they are whipped out on i386, but I'm sure about amd64.

Do I need to write parameters to %rbp offset, then follow the x86-abi for
registers to write to before making the function call?  When I disassemble C
code, it looks like the parameters are written to %rbp, then to the registers
per the x86-84 abi, and then the function is called?  Is this the preferred way
to write function calls?  And I would use the same method to save the return
value in %rax, right?

Thanks,

Brian 


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