Update lib

vendor/golang.org/x/net/http2/databuffer.go

@@ -20,41 +20,44 @@ import (
 // TODO: Benchmark to determine if the pools are necessary. The GC may have
 // improved enough that we can instead allocate chunks like this:
 // make([]byte, max(16<<10, expectedBytesRemaining))
-var (
-	dataChunkSizeClasses = []int{
-		1 << 10,
-		2 << 10,
-		4 << 10,
-		8 << 10,
-		16 << 10,
-	}
-	dataChunkPools = [...]sync.Pool{
-		{New: func() interface{} { return make([]byte, 1<<10) }},
-		{New: func() interface{} { return make([]byte, 2<<10) }},
-		{New: func() interface{} { return make([]byte, 4<<10) }},
-		{New: func() interface{} { return make([]byte, 8<<10) }},
-		{New: func() interface{} { return make([]byte, 16<<10) }},
-	}
-)
+var dataChunkPools = [...]sync.Pool{
+	{New: func() interface{} { return new([1 << 10]byte) }},
+	{New: func() interface{} { return new([2 << 10]byte) }},
+	{New: func() interface{} { return new([4 << 10]byte) }},
+	{New: func() interface{} { return new([8 << 10]byte) }},
+	{New: func() interface{} { return new([16 << 10]byte) }},
+}
 
 func getDataBufferChunk(size int64) []byte {
-	i := 0
-	for ; i < len(dataChunkSizeClasses)-1; i++ {
-		if size <= int64(dataChunkSizeClasses[i]) {
-			break
-		}
+	switch {
+	case size <= 1<<10:
+		return dataChunkPools[0].Get().(*[1 << 10]byte)[:]
+	case size <= 2<<10:
+		return dataChunkPools[1].Get().(*[2 << 10]byte)[:]
+	case size <= 4<<10:
+		return dataChunkPools[2].Get().(*[4 << 10]byte)[:]
+	case size <= 8<<10:
+		return dataChunkPools[3].Get().(*[8 << 10]byte)[:]
+	default:
+		return dataChunkPools[4].Get().(*[16 << 10]byte)[:]
 	}
-	return dataChunkPools[i].Get().([]byte)
 }
 
 func putDataBufferChunk(p []byte) {
-	for i, n := range dataChunkSizeClasses {
-		if len(p) == n {
-			dataChunkPools[i].Put(p)
-			return
-		}
+	switch len(p) {
+	case 1 << 10:
+		dataChunkPools[0].Put((*[1 << 10]byte)(p))
+	case 2 << 10:
+		dataChunkPools[1].Put((*[2 << 10]byte)(p))
+	case 4 << 10:
+		dataChunkPools[2].Put((*[4 << 10]byte)(p))
+	case 8 << 10:
+		dataChunkPools[3].Put((*[8 << 10]byte)(p))
+	case 16 << 10:
+		dataChunkPools[4].Put((*[16 << 10]byte)(p))
+	default:
+		panic(fmt.Sprintf("unexpected buffer len=%v", len(p)))
 	}
-	panic(fmt.Sprintf("unexpected buffer len=%v", len(p)))
 }
 
 // dataBuffer is an io.ReadWriter backed by a list of data chunks.