vendor/github.com/klauspost/compress/zstd/internal/xxhash/xxhash_amd64.go

// +build !appengine
// +build gc
// +build !purego

package xxhash

// Sum64 computes the 64-bit xxHash digest of b.
//
//go:noescape
func Sum64(b []byte) uint64

//go:noescape
func writeBlocks(*Digest, []byte) int