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common/math: "optimised" SafeMul and added comment on Exp (#3675)

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This commit is contained in:
Jeffrey Wilcke
2017-02-17 18:39:43 +01:00
committed by GitHub
parent 6f74fb962e
commit bf21549faa
2 changed files with 5 additions and 2 deletions
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4
common/math/integer.go
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@ -18,8 +18,8 @@ func SafeAdd(x, y uint64) (uint64, bool) {
// SafeMul returns multiplication result and whether overflow occurred.
func SafeMul(x, y uint64) (uint64, bool) {
if x == 0 {
if x == 0 || y == 0 {
return 0, false
}
return x * y, x != 0 && y != 0 && y > gmath.MaxUint64/x
return x * y, y > gmath.MaxUint64/x
}