EVM64

64-bit mode EVM opcodes

EVM64 is a series of EIPs that define 64-bit mode for Ethereum Virtual Machine. Not all computations in EVM can utilize the full 256-bit integer width. EVM64 can therefore be beneficial to avoid unnecessary cycles.

Options

There are two "options" available for EVM64 – two different types of implementations with their tradeoffs.

Option A: Prefix Opcode

The first option is to define EVM64 via a prefix opcode 0xC0. It contains the following EIPs.

EIP-7937 of EVM64 for endianness-independent arithmetic, comparison, bitwise and flow operations.
EIP-9819 for EOF support.
EIP-9821 for little-endian BYTE64, MLOAD64, MSTORE64 and PUSH*64 opcodes.

Option B: EOF code section

The second option is to define EVM64 as a new code type in EOF. It contains the following EIPs.

EIP-9834 which defines an extended version of types_section for EOF.
EIP-9835 which defines the EVM64 code section type.