NoBey/uniswap-v2
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fix stale cache bug from SLOAD optimization

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This commit is contained in:
Noah Zinsmeister
2020-01-27 18:13:43 -05:00
parent 0b37035f04
commit 452b531205
2 changed files with 52 additions and 10 deletions
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16
contracts/UniswapV2Exchange.sol
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@ -95,15 +95,15 @@ contract UniswapV2Exchange is IUniswapV2Exchange, UniswapV2ERC20 {
// mint liquidity
function mint(address to) external lock returns (uint liquidity) {
uint _totalSupply = totalSupply; // gas savings
uint112 _reserve0 = reserve0; // gas savings
uint112 _reserve1 = reserve1; // gas savings
uint112 _reserve0 = reserve0; // gas savings
uint112 _reserve1 = reserve1; // gas savings
uint balance0 = IERC20(token0).balanceOf(address(this));
uint balance1 = IERC20(token1).balanceOf(address(this));
uint amount0 = balance0.sub(_reserve0);
uint amount1 = balance1.sub(_reserve1);
bool feeOn = _mintFee(_reserve0, _reserve1);
uint _totalSupply = totalSupply; // gas savings
liquidity = _totalSupply == 0
? Math.sqrt(amount0.mul(amount1))
: Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
@ -117,16 +117,16 @@ contract UniswapV2Exchange is IUniswapV2Exchange, UniswapV2ERC20 {
// burn liquidity
function burn(address to) external lock returns (uint amount0, uint amount1) {
uint _totalSupply = totalSupply; // gas savings
uint112 _reserve0 = reserve0; // gas savings
uint112 _reserve1 = reserve1; // gas savings
address _token0 = token0; // gas savings
address _token1 = token1; // gas savings
uint112 _reserve0 = reserve0; // gas savings
uint112 _reserve1 = reserve1; // gas savings
address _token0 = token0; // gas savings
address _token1 = token1; // gas savings
uint balance0 = IERC20(_token0).balanceOf(address(this));
uint balance1 = IERC20(_token1).balanceOf(address(this));
uint liquidity = balanceOf[address(this)];
bool feeOn = _mintFee(_reserve0, _reserve1);
uint _totalSupply = totalSupply; // gas savings
amount0 = liquidity.mul(balance0) / _totalSupply; // use balances instead of reserves to address force sends
amount1 = liquidity.mul(balance1) / _totalSupply; // use balances instead of reserves to address force sends
require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED');