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txscript: optimize IsUnspendable by removing all allocations #1375

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txscript: optimize IsUnspendable by removing all allocations #1375

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14 changes: 5 additions & 9 deletions txscript/script.go
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Original file line number Diff line number Diff line change
Expand Up @@ -847,14 +847,10 @@ func getWitnessSigOps(pkScript []byte, witness wire.TxWitness) int {
return 0
}

// IsUnspendable returns whether the passed public key script is unspendable, or
// guaranteed to fail at execution. This allows inputs to be pruned instantly
// when entering the UTXO set.
// IsUnspendable returns whether the passed public key script is unspendable,
// or guaranteed to fail at execution. This allows outputs to be pruned
// instantly when entering the UTXO set.
func IsUnspendable(pkScript []byte) bool {
pops, err := parseScript(pkScript)
if err != nil {
return true
}

return len(pops) > 0 && pops[0].opcode.value == OP_RETURN
return (len(pkScript) > 0 && pkScript[0] == OP_RETURN) ||
(len(pkScript) > MaxScriptSize)
}