SquirrelJME/SquirrelJME

# 2015/08/12

***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._

## 11:40

After splitting the parts of the code, recompilation does seem much faster as
less dependencies and less code is compiled in two independent packages. I
figure for the SSA register allocation that it is segment (basic block) local
so it is easier to generate code for (live and not live, etc.).

## 11:45

In another note, LLVM's basic blocks have it so invoke of external functions
is at the end of a basic block. Currently for me I have it so the invoke of
methods is not on a terminating block. Based on reading GCC does what I do in
that function calls do not mean the end of a block. Also Wikipedia states that
any instruction that can throw an exception is the end of a block, but that
would mean (in terms of Java) that anything can throw an exception for the
most part, which would mean very small blocks.

## 18:21

I suppose register allocation is the hardest part of SSA, since it is NP-
complete. Means it can take decades to find the optimal solution with current
algorithms. I could go for sub-optimal and remove the NP-complete taking
forever nature of it however.