Does the element on stack has the same size?

[Colin(Du Li)]

Hello,

I have a question about hotspot operand stack.
I find following codes in abstractinterpreter.hpp
  static int stackElementWords()   { return TaggedStackInterpreter ? 2 : 1;
}

Does that mean the size of any element on stack is either 1 or 2 words,
right?
If so, how the stack can store double type parameters?
e.g.
for method:   M(double d){}
How can parameter 'd' can be pushed into operand stack before the method 'M'
is executed? 
Thanks a lot!

Du LI
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