perf: Speedup coins.Sort() when coins is of length 1 (backport #18875) (#18878)

Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

CHANGELOG.md

@@ -40,6 +40,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Improvements
 
 * (client/tx) [#18852](https://github.com/cosmos/cosmos-sdk/pull/18852) Add `WithFromName` to tx factory.
+* (types) [#18875](https://github.com/cosmos/cosmos-sdk/pull/18875) Speedup coins.Sort() if len(coins) <= 1
 
 ## [v0.47.7](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.47.7) - 2023-12-20
 

types/coin.go

@@ -827,7 +827,12 @@ var _ sort.Interface = Coins{}
 
 // Sort is a helper function to sort the set of coins in-place
 func (coins Coins) Sort() Coins {
-	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
 }