Redundant SLOAD Detector

WHAT IT DOES

Redundant SLOAD Detector is a read-only developer tool that analyzes EVM smart contract bytecode to identify repeated storage load operations (SLOAD) that can be optimized. It scans contract bytecode for the 0x54 SLOAD opcode, tracks storage slot access patterns, identifies duplicate loads of the same storage slot within close proximity, and calculates storage access efficiency. The tool provides actionable insights on redundant SLOAD pairs, frequently accessed storage slots, and potential gas savings—each redundant SLOAD costs approximately 100 gas (or more depending on network conditions). It helps developers optimize contract gas usage by identifying opportunities to cache storage values in memory, reducing transaction costs for end users.

HOW TO USE

Connect your EVM-compatible wallet via the BGWallet bridge and select the network where your contract is deployed. Enter the contract address and click "Detect Redundant SLOADs". The tool fetches the bytecode, scans for SLOAD opcodes, maps each load to its storage slot by analyzing preceding PUSH operations, detects repeated loads of the same slot within close bytecode distance, and generates a comprehensive report. Results include the total number of SLOAD operations, unique storage slots accessed, count of redundant SLOAD pairs, storage access efficiency percentage, a detailed list of redundant pairs with estimated gas savings, and prioritized optimization suggestions. All analysis is read-only—no signatures or transactions are submitted.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to fetch contract bytecode via provider.getCode(address), then performs static bytecode analysis to detect storage access patterns. It scans the entire bytecode hex string for the SLOAD opcode pattern (0x54). For each SLOAD found, the tool looks backward in the bytecode to identify the preceding PUSH operation (opcodes 0x60 through 0x7F) that pushes the storage slot address onto the stack. This is done by scanning backward up to 80 bytes and matching against PUSH patterns with their variable-length immediate values (2-40 hex characters). Each SLOAD is mapped to its target storage slot, allowing the tool to group loads by slot. The detection engine then identifies redundant pairs by comparing each SLOAD's slot against subsequent SLOADs within a 200-byte window—if the same slot is loaded again within this distance, it's flagged as potentially redundant. The tool calculates storage access efficiency as the percentage of SLOADs that are not redundant, and generates suggestions including caching recommendations, gas savings estimates, and optimization priority levels. The analysis is purely static and does not execute any contract functions or simulate transactions.

WHAT IT CANNOT SEE

This tool has fundamental limitations that users must understand. It cannot detect redundant SLOADs across function boundaries or in complex control flow with multiple branches—the analysis is limited to the linear bytecode sequence and cannot account for execution paths that may not be taken. It cannot differentiate between intentional re-reads for safety/consistency checks and truly redundant operations—some contracts re-read storage to ensure atomicity or guard against reentrancy, and these are not truly redundant. It cannot analyze dynamic storage accesses where slot targets are computed at runtime—when the slot address is calculated through complex arithmetic or derived from caller addresses, the tool cannot determine if repeated loads target the same slot. It cannot provide accurate analysis for unverified or heavily optimized bytecode where SLOAD patterns may be obfuscated by compiler optimizations or inlined assembly. It cannot detect redundant SLOADs that occur in loop iterations where the slot value changes—the tool does not track state changes between loads. It cannot assess the actual runtime impact of removing a redundant SLOAD, as gas costs vary based on network conditions, contract size, and compiler settings. It cannot suggest code fixes—only identify patterns that may benefit from manual optimization. The tool's slot detection is heuristic and may produce false positives when PUSH operations are not directly related to the subsequent SLOAD.

PLEASE NOTE

This tool only supports EVM-compatible blockchains (Ethereum, Polygon, BSC, Avalanche C-Chain, Optimism, Arbitrum, and their testnets). Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. The tool is free, open-source, requires no API keys, and uses the wallet's native provider for all read operations. Always validate optimizations with thorough testing before deploying to production.