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perf: Speedup DecCoin.Sort() when coins is of length 1 (backport #18888) #18890

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Dec 26, 2023
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perf: Speedup DecCoin.Sort() when coins is of length 1 (backport #18888) #18890

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39f6280
perf: Speedup DecCoin.Sort() when coins is of length 1 (#18888)
DongLieu Dec 26, 2023
8cc5f3f
fix changelog
tac0turtle Dec 26, 2023
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -46,6 +46,7 @@ Ref: https://keepachangelog.com/en/1.0.0/

### Improvements

* (types) [#18888](https://github.com/cosmos/cosmos-sdk/pull/18888) Speedup DecCoin.Sort() if len(coins) <= 1
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Changelog should be under unreleased.

* (x/gov) [#18707](https://github.com/cosmos/cosmos-sdk/pull/18707) Improve genesis validation.
* (server) [#18478](https://github.com/cosmos/cosmos-sdk/pull/18478) Add command flag to disable colored logs.

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7 changes: 6 additions & 1 deletion types/dec_coin.go
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Expand Up @@ -611,7 +611,12 @@ func (coins DecCoins) Swap(i, j int) { coins[i], coins[j] = coins[j], coins[i] }

// Sort is a helper function to sort the set of decimal coins in-place.
func (coins DecCoins) Sort() DecCoins {
sort.Sort(coins)
// sort.Sort(coins) does a costly runtime copy as part of `runtime.convTSlice`
// So we avoid this heap allocation if len(coins) <= 1. In the future, we should hopefully find
// a strategy to always avoid this.
if len(coins) > 1 {
sort.Sort(coins)
}
return coins
}

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