copy over loop

core/types/common.go

@@ -3,8 +3,8 @@ package types
 import (
 	"math/big"
 
-	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/state"
 
 	"fmt"
 )
@@ -28,10 +28,7 @@ func (b *Bloom) SetBytes(d []byte) {
 		panic(fmt.Sprintf("bloom bytes too big %d %d", len(b), len(d)))
 	}
 
-	// reverse loop
-	for i := len(d) - 1; i >= 0; i-- {
-		b[bloomLength-len(d)+i] = b[i]
-	}
+	copy(b[bloomLength-len(d):], d)
 }
 
 func (b Bloom) Big() *big.Int {