Reduced gas cost for call to self

EIPS/eip-draft_reduced_gas_cost_for_call_to_self.md

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+---
+eip: <to be assigned>
+title: Reduced gas cost for call to self
+author: Alex Beregszaszi (@axic)
+discussions-to: <TBA>
+status: Draft
+type: Standards Track
+category: Core
+created: 2018-08-31
+requires: 150
+---
+
+## Abstract
+Reduce the gas cost for call instructions, when the goal is to run a new instance of the currently loaded contract.
+
+## Motivation
+TBA (there's a lot to write here)
+
+## Specification
+If `block.number >= FORK_BLKNUM`, then decrease the cost of `CALL`, `DELEGATECALL`, `CALLCODE` and `STATICCALL` from 700 to 40,
+if and only if, the destination address of the call equals to the address of the caller.
+
+## Rationale
+EIP150 has increased the cost of these instructions from 40 to 700 to more fairly charge for loading new contracts from disk, e.g. to reflect the I/O charge more closely.
+By assuming that 660 is the cost of loading a contract from disk, one can assume that the original 40 gas is a fair cost of creating a new VM instance of an already loaded contract code.
+
+## Backwards Compatibility
+This should pose no risk to backwards compatibility. Currently existing contracts should not notice the difference, just see cheaper execution.
+With EIP150 contract (and language) developers had a lesson that relying on strict gas costs is not feasible as costs may change.
+The impact of this EIP is even less that of EIP150 because the costs are changing downwards and not upwards.
+
+## Test Cases
+TBA
+
+## Implementation
+TBA
+
+## Copyright
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).