uint256 add

[thedavidmeister]

Motivation

Solution

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Summary by CodeRabbit

• New Features

  • Introduced a new operation for adding multiple uint256 values with overflow protection.
  • Expanded interpreter capabilities to support the new uint256 addition operation.

• Tests

  • Added comprehensive tests for the new uint256 addition operation, including integrity checks, runtime behavior, and overflow scenarios.
  • Updated test statistics and added new test cases to improve coverage.

• Style

  • Refined test input formatting for multiplication operation tests to use explicit hexadecimal and named constants.

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Important

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Walkthrough

A new opcode for uint256 addition ("uint256-add") has been introduced, including its implementation, integration into the opcode registry, and comprehensive tests. The opcode sums multiple uint256 values with overflow checking. Associated gas usage and test statistics were updated, and some test input formats for uint256 multiplication were clarified.

Changes

File(s)	Change Summary
src/lib/op/LibAllStandardOps.sol	Registered new "uint256-add" opcode: updated opcode count, metadata, operand, integrity, and run arrays.
src/lib/op/math/uint256/LibOpUint256Add.sol	Added new library implementing uint256 addition with overflow checks and reference/test helpers.
test/src/lib/op/math/uint256/LibOpUint256Add.t.sol	Added comprehensive tests for the new uint256-add opcode, covering integrity, runtime, and errors.
test/src/lib/op/math/uint256/LibOpUint256Mul.t.sol	Updated test input formats for uint256 multiplication (clarified constants, no logic changes).
.gas-snapshot	Updated gas usage and test statistics; added entries for new uint256-add tests.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant Interpreter
    participant LibOpUint256Add

    Client->>Interpreter: Request execution with "uint256-add" opcode
    Interpreter->>LibOpUint256Add: Call integrity() to validate operand/input count
    LibOpUint256Add-->>Interpreter: Return input/output count (must be ≥2 inputs, 1 output)
    Interpreter->>LibOpUint256Add: Call run() with stack and operand
    LibOpUint256Add-->>Interpreter: Sum inputs, revert on overflow, return result on stack
    Interpreter-->>Client: Return execution result or error

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Possibly related PRs

• 2025 07 17 mul #368: Introduces a uint256 multiplication opcode and its tests, modifying the same opcode registration arrays and adding analogous opcode libraries and tests, making it directly related in structure and integration approach.

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