countlines in go asm, v1

countlines_amd64.go

@@ -0,0 +1,14 @@
+//go:build amd64 && !gccgo && !appengine
+
+package countlines
+
+func CountNewlines(s []byte) uint64 {
+	if len(s) == 0 {
+		return 0
+	}
+
+	return countNewlinesASM(&s[0], uint64(len(s)))
+}
+
+//go:noescape
+func countNewlinesASM(src *byte, len uint64) (ret uint64)