Use big.Sign to compare with zero

core/rawdb/accessors_chain.go

@@ -1226,15 +1226,15 @@ func Transitioned(db kv.Getter, blockNum uint64, terminalTotalDifficulty *big.In
 		return false, nil
 	}
 
-	if terminalTotalDifficulty.Cmp(common.Big0) == 0 {
+	if terminalTotalDifficulty.Sign() == 0 {
 		return true, nil
 	}
 	header := ReadHeaderByNumber(db, blockNum)
 	if header == nil {
 		return false, nil
 	}
 
-	if header.Difficulty.Cmp(common.Big0) == 0 {
+	if header.Difficulty.Sign() == 0 {
 		return true, nil
 	}
 
@@ -1256,7 +1256,7 @@ func IsPosBlock(db kv.Getter, blockHash common.Hash) (trans bool, err error) {
 		return false, nil
 	}
 
-	return header.Difficulty.Cmp(common.Big0) == 0, nil
+	return header.Difficulty.Sign() == 0, nil
 }
 
 var SnapshotsKey = []byte("snapshots")

eth/backend.go

@@ -238,7 +238,7 @@ const blockBufferSize = 128
 // initialisation of the common Ethereum object)
 func New(ctx context.Context, stack *node.Node, config *ethconfig.Config, logger log.Logger) (*Ethereum, error) {
 	config.Snapshot.Enabled = config.Sync.UseSnapshots
-	if config.Miner.GasPrice == nil || config.Miner.GasPrice.Cmp(libcommon.Big0) <= 0 {
+	if config.Miner.GasPrice == nil || config.Miner.GasPrice.Sign() <= 0 {
 		logger.Warn("Sanitizing invalid miner gas price", "provided", config.Miner.GasPrice, "updated", ethconfig.Defaults.Miner.GasPrice)
 		config.Miner.GasPrice = new(big.Int).Set(ethconfig.Defaults.Miner.GasPrice)
 	}

turbo/engineapi/engine_block_downloader/block_downloader.go

@@ -193,7 +193,7 @@ func (e *EngineBlockDownloader) loadDownloadedHeaders(tx kv.RwTx) (fromBlock uin
 			return saveHeader(tx, &h, h.Hash())
 		}
 
-		foundPow = h.Difficulty.Cmp(libcommon.Big0) != 0
+		foundPow = h.Difficulty.Sign() != 0
 		if foundPow {
 			if (fromHash == libcommon.Hash{}) {
 				fromHash = h.Hash()

turbo/jsonrpc/trace_filtering.go

@@ -425,7 +425,7 @@ func (api *TraceAPIImpl) filterV3(ctx context.Context, dbtx kv.TemporalTx, fromB
 
 			if !isPos && chainConfig.TerminalTotalDifficulty != nil {
 				header := lastHeader
-				isPos = header.Difficulty.Cmp(common.Big0) == 0 || header.Difficulty.Cmp(chainConfig.TerminalTotalDifficulty) >= 0
+				isPos = header.Difficulty.Sign() == 0 || header.Difficulty.Cmp(chainConfig.TerminalTotalDifficulty) >= 0
 			}
 
 			lastBlockHash = lastHeader.Hash()