This EIP removes the gas costs of the CALL-like opcodes when calling precompiled contracts.
## Abstract
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.
## Motivation
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.
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.
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.
## Specification
If `block.number >= XXXXX`, for each CALL, DELEGATECALL and CALLCODE opcode with a destination address <256useaGcall(basiccostofthecall)of0insteadof700.
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.
## Rationale
This implementation is the one that needs less modification of the clients.
## Backwards Compatibility
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.
