Submission db11d3ae...

Challenge	Remove duplicate elements
Submitter	wicketh.eth
Submitted at	2018-02-27
Gas used	158788

/**
 * 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
        let ptr
        let index2
        let iv
        let index1
        let last2 := 0
        let last1 := 0
        let vhash

        i := calldataload(36)
        jumpi(main512, gt(i, 128))
        jumpi(main256, gt(i, 64))
        jumpi(main128, gt(i, 0))
        
    main0:
        // Empty list
        mstore(0, 32)
        mstore(32, 0)
        return(0, 64)
        
    main128:
        // Table size 97
        ptr := 0xC60
        i := 68
        
    oloop128:
        // Read value
        vhash := not(calldataload(i))
        
        // Check recent values
        jumpi(seen128, or(eq(vhash, last1), eq(vhash, last2)))
        last2 := last1
        last1 := vhash
        
        // Compute index 1
        index1 := mul(mod(vhash, 97), 32)
        
        // Read index 1
        iv := mload(index1)
        jumpi(unique1128, iszero(iv))
        jumpi(seen128, eq(iv, vhash))
        
        // Increment and test index 1
        index1 := mod(add(index1, 32), 0xC20)
        iv := mload(index1)
        jumpi(unique1128, iszero(iv))
        jumpi(seen128, eq(iv, vhash))
        
        // Compute index 2
        index2 := mul(mod(mul(vhash, 0x1b6d296aa8b7284041b9f0e36895d18399d8026b57a51e5af0ed54c3e03bd3a1), 97), 32)
        
        // Read index 2
        iv := mload(index2)
        jumpi(unique2128, iszero(iv))
        jumpi(seen128, eq(iv, vhash))
        
    iloop128:
        // Increment and test index 1
        index1 := mod(add(index1, 32), 0xC20)
        iv := mload(index1)
        jumpi(unique1128, iszero(iv))
        jumpi(seen128, eq(iv, vhash))
        
        // Incerment and test index 2
        index2 := mod(add(index2, 32), 0xC20)
        iv := mload(index2)
        jumpi(unique2128, iszero(iv))
        jumpi(seen128, eq(iv, vhash))
        
        // Increment and test index 1
        index1 := mod(add(index1, 32), 0xC20)
        iv := mload(index1)
        jumpi(unique1128, iszero(iv))
        jumpi(seen128, eq(iv, vhash))
        
        // Incerment and test index 2
        index2 := mod(add(index2, 32), 0xC20)
        iv := mload(index2)
        jumpi(unique2128, iszero(iv))
        jumpi(seen128, eq(iv, vhash))
        
        // Loop
        jump(iloop128)
        
    seen128:
        // Resume loop
        i := add(i, 32)
        jumpi(oloop128, lt(i, calldatasize))
        jump(oloop_end128)
    
    unique2128:
        // 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(oloop128, lt(i, calldatasize))
        jump(oloop_end128)
        
    unique1128:
        // 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(oloop128, lt(i, calldatasize))
    
    oloop_end128:
        mstore(0xC20, 32)
        mstore(0xC40, div(sub(ptr, 0xC60), 32))
        return(0xC20, sub(ptr, 0xC20))
    

    main256:
        // Table size 193
        ptr := 0x1860
        i := 68
        
    oloop256:
        // Read value
        vhash := not(calldataload(i))
        
        // Check recent values
        jumpi(seen256, or(eq(vhash, last1), eq(vhash, last2)))
        last2 := last1
        last1 := vhash
        
        // Compute index 1
        index1 := mul(mod(vhash, 193), 32)
        
        // Read index 1
        iv := mload(index1)
        jumpi(unique1256, iszero(iv))
        jumpi(seen256, eq(iv, vhash))
        
        // Increment and test index 1
        index1 := mod(add(index1, 32), 0x1820)
        iv := mload(index1)
        jumpi(unique1256, iszero(iv))
        jumpi(seen256, eq(iv, vhash))
        
        // Compute index 2
        index2 := mul(mod(mul(vhash,
0x1b6d296aa8b7284041b9f0e36895d18399d8026b57a51e5af0ed54c3e03bd3a1
        ), 193), 32)
        
        // Read index 2
        iv := mload(index2)
        jumpi(unique2256, iszero(iv))
        jumpi(seen256, eq(iv, vhash))
        
    iloop256:
        // Increment and test index 1
        index1 := mod(add(index1, 32), 0x1820)
        iv := mload(index1)
        jumpi(unique1256, iszero(iv))
        jumpi(seen256, eq(iv, vhash))
        
        // Incerment and test index 2
        index2 := mod(add(index2, 32), 0x1820)
        iv := mload(index2)
        jumpi(unique2256, iszero(iv))
        jumpi(seen256, eq(iv, vhash))
        
        // Increment and test index 1
        index1 := mod(add(index1, 32), 0x1820)
        iv := mload(index1)
        jumpi(unique1256, iszero(iv))
        jumpi(seen256, eq(iv, vhash))
        
        // Incerment and test index 2
        index2 := mod(add(index2, 32), 0x1820)
        iv := mload(index2)
        jumpi(unique2256, iszero(iv))
        jumpi(seen256, eq(iv, vhash))
        
        // Loop
        jump(iloop256)
        
    seen256:
        // Resume loop
        i := add(i, 32)
        jumpi(oloop256, lt(i, calldatasize))
        jump(oloop_end256)
    
    unique2256:
        // 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(oloop256, lt(i, calldatasize))
        jump(oloop_end256)
        
    unique1256:
        // 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(oloop256, lt(i, calldatasize))
    
    oloop_end256:
        mstore(0x1820, 32)
        mstore(0x1840, div(sub(ptr, 0x1860), 32))
        return(0x1820, sub(ptr, 0x1820))

    main512:
        ptr := 0x4040
        i := 68
        
    oloop512:
        // Read value
        vhash := not(calldataload(i))
        
        // Check recent values
        jumpi(seen512, or(eq(vhash, last1), eq(vhash, last2)))
        last2 := last1
        last1 := vhash
        
        // Compute index 1
        index1 := and(mul(vhash, 32), 0x3fe0)
        
        // Read index 1
        iv := mload(index1)
        jumpi(unique1512, iszero(iv))
        jumpi(seen512, eq(iv, vhash))
        
        // Increment and test index 1
        index1 := and(add(index1, 32), 0x3fe0)
        iv := mload(index1)
        jumpi(unique1512, iszero(iv))
        jumpi(seen512, eq(iv, vhash))
        
        // Compute index 2
        index2 := and(div(mul(vhash,
0x1b6d296aa8b7284041b9f0e36895d18399d8026b57a51e5af0ed54c3e03bd3a1
        ), 0x1000000000000001), 0x0fe0)
        
        // Read index 2
        iv := mload(index2)
        jumpi(unique2512, iszero(iv))
        jumpi(seen512, eq(iv, vhash))
        
    iloop512:
        // Increment and test index 1
        index1 := and(add(index1, 32), 0x3fe0)
        iv := mload(index1)
        jumpi(unique1512, iszero(iv))
        jumpi(seen512, eq(iv, vhash))
        
        // Incerment and test index 2
        index2 := and(add(index2, 32), 0x3fe0)
        iv := mload(index2)
        jumpi(unique2512, iszero(iv))
        jumpi(seen512, eq(iv, vhash))
        
        // Increment and test index 1
        index1 := and(add(index1, 32), 0x3fe0)
        iv := mload(index1)
        jumpi(unique1512, iszero(iv))
        jumpi(seen512, eq(iv, vhash))
        
        // Incerment and test index 2
        index2 := and(add(index2, 32), 0x3fe0)
        iv := mload(index2)
        jumpi(unique2512, iszero(iv))
        jumpi(seen512, eq(iv, vhash))
        
        // Loop
        jump(iloop512)
        
    seen512:
        // Resume loop
        i := add(i, 32)
        jumpi(oloop512, lt(i, calldatasize))
        jump(oloop_end512)
    
    unique2512:
        // 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(oloop512, lt(i, calldatasize))
        jump(oloop_end512)
        
    unique1512:
        // 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(oloop512, lt(i, calldatasize))
    
    oloop_end512:
        mstore(0x4000, 32)
        mstore(0x4020, div(sub(ptr, 0x4040), 32))
        return(0x4000, sub(ptr, 0x4000))




    }}
    
}