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assembly-patterns

Yul/inline assembly patterns for advanced Solidity optimization. Use only when gas savings are significant and measured. Covers memory management, efficient hashing, bitwise operations, custom errors, low-level calls, and returndata handling.

skills/assembly-patterns/SKILL.md

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# Assembly Patterns

## When to Use Assembly

Only use assembly when:
1. Gas savings are **measured** (not assumed) via `forge test --gas-report`
2. The optimization is in a **hot path** (called frequently)
3. Solidity cannot express the operation (e.g., specific memory layout)
4. Savings exceed 500 gas per call for the added complexity

Always add `@dev` NatSpec explaining why assembly is used and what it does.

## Memory Management