1 files changed, 41 insertions, 0 deletions
diff --git a/libgo/go/bytes/bytes_generic.go b/libgo/go/bytes/bytes_generic.go
new file mode 100644
index 0000000000..91baa22aa2
--- /dev/null
+++ b/libgo/go/bytes/bytes_generic.go
@@ -0,0 +1,41 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// -build !amd64,!s390x
+
+package bytes
+
+// TODO: implements short string optimization on non amd64 platforms
+// and get rid of bytes_amd64.go
+
+// Index returns the index of the first instance of sep in s, or -1 if sep is not present in s.
+func Index(s, sep []byte) int {
+	n := len(sep)
+	if n == 0 {
+		return 0
+	}
+	if n > len(s) {
+		return -1
+	}
+	c := sep[0]
+	if n == 1 {
+		return IndexByte(s, c)
+	}
+	i := 0
+	t := s[:len(s)-n+1]
+	for i < len(t) {
+		if t[i] != c {
+			o := IndexByte(t[i:], c)
+			if o < 0 {
+				break
+			}
+			i += o
+		}
+		if Equal(s[i:i+n], sep) {
+			return i
+		}
+		i++
+	}
+	return -1
+}