Optimisation (execution)

[malcolmstill]

• [x] https://github.com/malcolmstill/foxwren/pull/84
• [x] https://github.com/malcolmstill/foxwren/pull/120
• [x] Fast if https://github.com/malcolmstill/foxwren/pull/132
  • Provide a faster if instruction for if blocks that have no else branch
• [x] Function-level stack overflow checking https://github.com/malcolmstill/foxwren/issues/130 https://github.com/malcolmstill/foxwren/pull/133
• [x] Reduce size of Instruction (replace usize with u32)? https://github.com/malcolmstill/foxwren/pull/134
• [ ] Fast call
  • Provide a faster call instruction for functions internal to a module
• [ ] Split out opcode from meta (for better cache packing)?
  • Only push metadata for instructions that have non-void metadata (better packing). Separate array for for index into the metadata array
• [ ] Dispatch with function pointers rather than lookup table