feat: Implement EIP-7843 SLOTNUM opcode for Amsterdam #3340
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Add the SLOTNUM opcode (0x4B) that returns the slot number for the current block as specified in EIP-7843. The slot number is passed from the consensus layer via the execution payload. Changes: - Add SLOTNUM opcode constant at 0x4B in bytecode - Add slot_num field to BlockEnv struct - Add slot_num method to Block trait with default returning 0 - Add slot_num method to Host trait - Implement slot_num instruction gated behind AMSTERDAM hardfork - Gas cost: 2 (aligned with similar base-level opcodes)
CodSpeed Performance ReportMerging this PR will not alter performanceComparing Summary
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Summary
Changes
SLOTNUMopcode constant at0x4Bin bytecodeslot_num: u64field toBlockEnvstructslot_num()method toBlocktrait with default returning0slot_num()method toHosttrait returningU256slot_numinstruction inblock_info.rsEIP Reference
https://eips.ethereum.org/EIPS/eip-7843
Test plan