evm: add clz example #4176
evm: add clz example #4176
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Pull Request Overview
This PR adds a new example demonstrating the CLZ (Count Leading Zeros) opcode introduced in EIP-7939 for the Osaka hardfork. The example shows how to use the new opcode with various test cases.
- Adds a comprehensive example file showcasing the CLZ opcode functionality
- Demonstrates four test cases covering edge cases: all zeros, minimal value, and different bit positions
- Uses manual bytecode assembly to construct and execute CLZ operations
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| import { type EVM, createEVM } from '@ethereumjs/evm' | ||
| import { type PrefixedHexString, hexToBytes } from '@ethereumjs/util' | ||
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| const common = new Common({ |
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Could we add a little bit more description/context as to what this does and what the purpose of this example is? We could also link to the EIP https://eips.ethereum.org/EIPS/eip-7939 etc.
2 participants
PR #4133 added support for the new CLZ opcode from EIP-7939.
The
CLZopcode (0x1e) pops one 256-bit word (x) from the stack and pushes the number of leading zero bits inx.This PR adds a small example script to demonstrate the opcode in action. It creates an Osaka hardfork EVM with EIP-7939 enabled and executes the CLZ opcode on a few different 32-byte inputs.