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Reduces mul execution cost #95

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Reduces mul execution cost #95

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9 changes: 1 addition & 8 deletions contracts/libraries/math/SafeMath.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -75,15 +75,8 @@ library SafeMath {
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}

uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
require(a == 0 || c / a == b, "SafeMath: multiplication overflow");

return c;
}
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