DISCLAIMER: These notes are from the defunct k8 project which precedes SquirrelJME. The notes for SquirrelJME start on 2016/02/26! The k8 project was effectively a Java SE 8 operating system and as such all of the notes are in the context of that scope. That project is no longer my goal as SquirrelJME is the spiritual successor to it.
For method calls I can just create a new SSAAllocator for the method to be called (SSAToMachine will handle that) then I can just place the registers in the correct location.
BigInteger based on Wolfram Alpha... Estimated max value: 8.808065258419816766037465748959201428335557790940673... * 10^646456992; 646456993 decimal digits. That is one large number. Wolfram Alpha also knows the escape velocity of Kepler-22 b, which is 97000 mph. Suppose you will need lots to fuel to get out of that place. A CPU with 32 2GiB general purpose registers may be worse than one with lots of smaller ones.