aluvm / aluvm-spec Goto Github PK

In order to allow better AluVM support & operations on low-memory hardware devices the following changes are proposed:

1. The data segment maximum length should be decreased to 2^16 (the same as code segment). If program needs more data, it should use special "data libraries".
2. The maximum number of used libraries per single library must be decreased to 256.
3. A new limit of "total libraries" is introduced and this amount should not exceed 1024.

This will allow to limit the size of a single library to just 136 kB (139520 bytes) and provide a restriction on total size of any program (some library + all of its tree descendant dependencies) at 136 MB, with the ability of having up to 64 MB of data.

Reduce the number of string registers down to 32 (from current 256); maintain ISA byte dimensions by using mod 32 (or mod 16 if an operation uses two string register indexes) to determine specific string register.

This will reduce memory requirements for on-chip registers from current > 16MB down to ~ 2MB

VM must be able to operate multiple strings of bytecode. Each string will be identified by tagged SHA256 hash of its data. Calls between libraries will be possible with special extcall opcode, providing library hash and entry point offset.

Support for float registers and all float-involved operations should be defined as a non-required extensions for AluVM implementations named "FLOAT". Since ~90% of tasks do not require float numbers this will allow easier implementation on the low-end hardware.