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perf: Only do memory allocation when zero coin is found #10339

Merged
merged 8 commits into from
Oct 13, 2021
1 change: 1 addition & 0 deletions CHANGELOG.md
Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
* [\#9699](https://github.com/cosmos/cosmos-sdk/pull/9699) Add `:`, `.`, `-`, and `_` as allowed characters in the default denom regular expression.
* (genesis) [\#9697](https://github.com/cosmos/cosmos-sdk/pull/9697) Ensure `InitGenesis` returns with non-empty validator set.
* [\#10262](https://github.com/cosmos/cosmos-sdk/pull/10262) Remove unnecessary logging in `x/feegrant` simulation.
* [\#10339](https://github.com/cosmos/cosmos-sdk/pull/10339) Improve performance of `removeZeroCoins` by only allocating memory when necessary

### Bug Fixes

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11 changes: 10 additions & 1 deletion types/coin.go
Original file line number Diff line number Diff line change
Expand Up @@ -626,7 +626,16 @@ func (coins Coins) negative() Coins {

// removeZeroCoins removes all zero coins from the given coin set in-place.
func removeZeroCoins(coins Coins) Coins {
result := make([]Coin, 0, len(coins))
var result []Coin

for i := 0; i < len(coins); i++ {
if coins[i].IsZero() {
result = make([]Coin, 0, len(coins))
break
} else if i == len(coins)-1 {
return coins
}
}
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for _, coin := range coins {
if !coin.IsZero() {
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