Imporve AppendHTMLEscape fast path (valyala#1249)

bytesconv.go

@@ -11,27 +11,18 @@ import (
 	"math"
 	"net"
 	"reflect"
-	"strings"
 	"sync"
 	"time"
 	"unsafe"
 )
 
 // AppendHTMLEscape appends html-escaped s to dst and returns the extended dst.
 func AppendHTMLEscape(dst []byte, s string) []byte {
-	if strings.IndexByte(s, '&') < 0 &&
-		strings.IndexByte(s, '<') < 0 &&
-		strings.IndexByte(s, '>') < 0 &&
-		strings.IndexByte(s, '"') < 0 &&
-		strings.IndexByte(s, '\'') < 0 {
-
-		// fast path - nothing to escape
-		return append(dst, s...)
-	}
+	var (
+		prev int
+		sub  string
+	)
 
-	// slow path
-	var prev int
-	var sub string
 	for i, n := 0, len(s); i < n; i++ {
 		sub = ""
 		switch s[i] {