perf: Speedup coins.AmountOf() by removing many regex calls (#10021)

CHANGELOG.md

@@ -91,6 +91,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/bank) [\#10022](https://github.com/cosmos/cosmos-sdk/pull/10022) `BankKeeper.SendCoins` now takes less execution time.
 * (deps) [\#9956](https://github.com/cosmos/cosmos-sdk/pull/9956) Bump Tendermint to [v0.34.12](https://github.com/tendermint/tendermint/releases/tag/v0.34.12).
 * (cli) [\#9856](https://github.com/cosmos/cosmos-sdk/pull/9856) Overwrite `--sequence` and `--account-number` flags with default flag values when used with `offline=false` in `sign-batch` command.
+* (types) [\#10021](https://github.com/cosmos/cosmos-sdk/pull/10021) Speedup coins.AmountOf(), by removing many intermittent regex calls.
 
 ### Bug Fixes
 

types/coin.go

@@ -522,7 +522,12 @@ func (coins Coins) Empty() bool {
 // AmountOf returns the amount of a denom from coins
 func (coins Coins) AmountOf(denom string) Int {
 	mustValidateDenom(denom)
+	return coins.AmountOfNoDenomValidation(denom)
+}
 
+// AmountOfNoDenomValidation returns the amount of a denom from coins
+// without validating the denomination.
+func (coins Coins) AmountOfNoDenomValidation(denom string) Int {
 	switch len(coins) {
 	case 0:
 		return ZeroInt()
@@ -535,15 +540,16 @@ func (coins Coins) AmountOf(denom string) Int {
 		return ZeroInt()
 
 	default:
+		// Binary search the amount of coins remaining
 		midIdx := len(coins) / 2 // 2:1, 3:1, 4:2
 		coin := coins[midIdx]
 		switch {
 		case denom < coin.Denom:
-			return coins[:midIdx].AmountOf(denom)
+			return coins[:midIdx].AmountOfNoDenomValidation(denom)
 		case denom == coin.Denom:
 			return coin.Amount
 		default:
-			return coins[midIdx+1:].AmountOf(denom)
+			return coins[midIdx+1:].AmountOfNoDenomValidation(denom)
 		}
 	}
 }