core: fix processing regression during receipt import

core/blockchain.go

@@ -665,10 +665,11 @@ func SetReceiptsData(config *params.ChainConfig, block *types.Block, receipts ty
 		// The transaction hash can be retrieved from the transaction itself
 		receipts[j].TxHash = transactions[j].Hash()
 
-		tx, _ := transactions[j].AsMessage(signer)
 		// The contract address can be derived from the transaction itself
-		if MessageCreatesContract(tx) {
-			receipts[j].ContractAddress = crypto.CreateAddress(tx.From(), tx.Nonce())
+		if transactions[j].To() == nil {
+			// Deriving the signer is expensive, only do if it's actually needed
+			from, _ := types.Sender(signer, transactions[j])
+			receipts[j].ContractAddress = crypto.CreateAddress(from, transactions[j].Nonce())
 		}
 		// The used gas can be calculated based on previous receipts
 		if j == 0 {

core/state_transition.go

@@ -78,10 +78,6 @@ type Message interface {
 	Data() []byte
 }
 
-func MessageCreatesContract(msg Message) bool {
-	return msg.To() == nil
-}
-
 // IntrinsicGas computes the 'intrinsic gas' for a message
 // with the given data.
 //
@@ -220,7 +216,7 @@ func (self *StateTransition) TransitionDb() (ret []byte, requiredGas, usedGas *b
 	sender := self.from() // err checked in preCheck
 
 	homestead := self.evm.ChainConfig().IsHomestead(self.evm.BlockNumber)
-	contractCreation := MessageCreatesContract(msg)
+	contractCreation := msg.To() == nil
 	// Pay intrinsic gas
 	// TODO convert to uint64
 	intrinsicGas := IntrinsicGas(self.data, contractCreation, homestead)