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EIP-1109: Remove call costs for precompiled contracts (ethereum#1109)
* Remove call costs for precompiled contracts * EIP number added and file name changed * Fixed discussion-to field * Fixed type and category fields * discussion-to field changed to ethereum-magicians * Change a bad change * Changed the discussion link
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eip: 1109 | ||
title: Remove CALL costs for precompiled contracts | ||
author: Jordi Baylina (@jbaylina) | ||
discussions-to: https://ethereum-magicians.org/t/eip-1109-remove-call-costs-for-precompiled-contracts/447 | ||
status: Draft | ||
type: Standards Track | ||
category: Core | ||
created: 2018-05-22 | ||
--- | ||
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## Simple Summary | ||
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This EIP removes the gas costs of the CALL-like opcodes when calling precompiled contracts. | ||
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## Abstract | ||
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This EIP tries to resolve the problem of high gas consumption when calling precompiled contracts with a small gas cost. Setting the gas costs to 0 when calling a precompiled contract allows to define precompiled contracts whose effective cost when calling it is less than 700. | ||
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## Motivation | ||
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Each precompiled contract has an already defined a cost for calling it. It does not make sense to add the implicit extra gas cost of the CALL opcode. | ||
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As an example, SHA256 precompiled contract costs 60 and ECADD costs 500 (proposed to costs only 50 in [EIP1108](https://github.com/ethereum/EIPs/pull/1108) . When a precompiled contract is called, 700 gas is consumed just for the CALL opcode besides the costs of the precompiled contract. | ||
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This makes no sense, and right now it's impossible to define a precompiled contract whose effective cost for using it is less than 700. | ||
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## Specification | ||
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If `block.number >= XXXXX`, for each CALL, DELEGATECALL and CALLCODE opcode with a destination address < 256 use a Gcall (basic cost of the call) of 0 instead of 700. | ||
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The cost of the CALL opcode is calculated in exactly the same way that any normal call, including the cost for using a value different than 0 and for creating a new account. The only difference is that Gcall is not added when calculating Cextra. | ||
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## Rationale | ||
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This implementation is the one that needs less modification of the clients. | ||
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## Backwards Compatibility | ||
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This EIP is backwards compatible. Smart contracts that call precompiled contracts will cost less from now on. Smart contracts that relay in a high gas consumption for a specific code are not expected. | ||
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## Test Cases | ||
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- Normal call to a defined smart contract. | ||
- Call to undefined smart contract. | ||
- Call to defined smart contract with a value!=0 on the call. | ||
- Call to undefined smart contract with a value!=0 on the call. | ||
- Normal call with remaining gas<700 but gas>[the cost of the call]. | ||
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## Implementation | ||
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Not implemented yet. | ||
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## Copyright | ||
Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/). |