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perf: Only do memory allocation when zero coin is found (backport #10339) #10361

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merged 2 commits into from
Oct 14, 2021
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perf: Only do memory allocation when zero coin is found (backport #10339) #10361

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859a0c6
perf: Only do memory allocation when zero coin is found (#10339)
waggonerjake Oct 13, 2021
0cf61ac
fix conflict
tac0turtle Oct 14, 2021
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ Ref: https://keepachangelog.com/en/1.0.0/

* [\#10262](https://github.com/cosmos/cosmos-sdk/pull/10262) Remove unnecessary logging in `x/feegrant` simulation.
* [\#10327](https://github.com/cosmos/cosmos-sdk/pull/10327) Add null guard for possible nil `Amount` in tx fee `Coins`
* [\#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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13 changes: 12 additions & 1 deletion types/coin.go
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Expand Up @@ -621,7 +621,18 @@ 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))
for i := 0; i < len(coins); i++ {
if coins[i].IsZero() {
break
} else if i == len(coins)-1 {
return coins
}
}

var result []Coin
if len(coins) > 0 {
result = make([]Coin, 0, len(coins)-1)
}

for _, coin := range coins {
if !coin.IsZero() {
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