improve mum performance and reduce gas cost

5ad07e18 · Chen Yi-Cyuan · 39d6c920 · 5ad07e18
Commit 5ad07e18 authored Oct 30, 2017 by Chen Yi-Cyuan
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SafeMath.sol contracts/math/SafeMath.sol +4 -1

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--- a/contracts/math/SafeMath.sol
+++ b/contracts/math/SafeMath.sol
@@ -7,8 +7,11 @@ pragma solidity ^0.4.11;
 */
 library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
+    if (a == 0) {
+      return 0;
+    }
    uint256 c = a * b;
-    assert(a == 0 || c / a == b);
+    assert(c / a == b);
    return c;
  }