Submission cfc44040...
/**
* This file is part of the 1st Solidity Gas Golfing Contest.
*
* This work is licensed under Creative Commons Attribution ShareAlike 3.0.
* https://creativecommons.org/licenses/by-sa/3.0/
*/
pragma solidity 0.4.24;
contract Unique {
function () external payable { assembly {
// @author Remco Bloemen <[email protected]>
mstore(0x40, 0)
let i := calldataload(36)
jumpi(main, i)
// Empty list
mstore(0, 32)
mstore(32, 0)
return(0, 64)
main:
// let i
let htl
let ptr
let index2
let iv
let index1
let scale
let last2
let last1
let vhash
// htl := and(mul(i, 64), 0xFFFFFFFFFFFFFE0)
// scale := add(div(sub(0, htl), htl), 1)
last1 := 0
last2 := 0
ptr := 0x2040
i := 68
oloop:
// Read value
vhash := not(calldataload(i))
// Check recent values
jumpi(seen, or(eq(vhash, last1), eq(vhash, last2)))
last2 := last1
last1 := vhash
// Compute index 1
index1 := and(mul(vhash, 32), 0x1fe0)
// Read index 1
iv := mload(index1)
jumpi(unique1, iszero(iv))
jumpi(seen, eq(iv, vhash))
// Increment and test index 1
index1 := and(add(index1, 32), 0x1fe0)
iv := mload(index1)
jumpi(unique1, iszero(iv))
jumpi(seen, eq(iv, vhash))
// Compute index 2
index2 := and(div(mul(vhash,
0x1b6d296aa8b7284041b9f0e36895d18399d8026b57a51e5af0ed54c3e03bd3a1
), 0x1000000000000001), 0x3fe0)
// Read index 2
iv := mload(index2)
jumpi(unique2, iszero(iv))
jumpi(seen, eq(iv, vhash))
iloop:
// Increment and test index 1
index1 := and(add(index1, 32), 0x1fe0)
iv := mload(index1)
jumpi(unique1, iszero(iv))
jumpi(seen, eq(iv, vhash))
// Incerment and test index 2
index2 := and(add(index2, 32), 0x1fe0)
iv := mload(index2)
jumpi(unique2, iszero(iv))
jumpi(seen, eq(iv, vhash))
// Increment and test index 1
index1 := and(add(index1, 32), 0x1fe0)
iv := mload(index1)
jumpi(unique1, iszero(iv))
jumpi(seen, eq(iv, vhash))
// Incerment and test index 2
index2 := and(add(index2, 32), 0x1fe0)
iv := mload(index2)
jumpi(unique2, iszero(iv))
jumpi(seen, eq(iv, vhash))
// Loop
jump(iloop)
seen:
// Resume loop
i := add(i, 32)
jumpi(oloop, lt(i, calldatasize))
jump(oloop_end)
unique2:
// Add to the hash table
mstore(index2, vhash)
// Add to start of list
mstore(ptr, not(vhash))
ptr := add(ptr, 32)
// Resume loop
i := add(i, 32)
jumpi(oloop, lt(i, calldatasize))
jump(oloop_end)
unique1:
// Add to the hash table
mstore(index1, vhash)
// Add to start of list
mstore(ptr, not(vhash))
ptr := add(ptr, 32)
// Resume loop
i := add(i, 32)
jumpi(oloop, lt(i, calldatasize))
oloop_end:
mstore(0x2000, 32)
mstore(0x2020, div(sub(ptr, 0x2040), 32))
return(0x2000, sub(ptr, 0x2000))
}}
}