Deep dive into Luau VM bytecode instruction set:

In Roblox Luau, standard Lua calls are optimized via OP_FASTCALL opcodes which bypass function lookup overhead for built-in library functions (math.sqrt, string.byte, table.insert).

• OP_FASTCALL1: Unary function call
• OP_FASTCALL2: Binary function call
• OP_FASTCALL2K: Fast call with constant operand

Understanding Luau opcode layouts allows writing custom disassemblers and bytecode execution engines!

Luau's fastcall architecture is a brilliant engineering enhancement over standard PUC Lua 5.1 bytecode.

Great breakdown of Luau compiler optimizations.