net: avoid array copy when shuffling SRV records
We don't need to shift array elements to shuffle them.
We just have to swap a selected element with 0th element.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/91750044
diff --git a/src/pkg/net/dnsclient.go b/src/pkg/net/dnsclient.go
index 9bffa11..e8014e4 100644
--- a/src/pkg/net/dnsclient.go
+++ b/src/pkg/net/dnsclient.go
@@ -196,9 +196,7 @@
s += int(addrs[i].Weight)
if s > n {
if i > 0 {
- t := addrs[i]
- copy(addrs[1:i+1], addrs[0:i])
- addrs[0] = t
+ addrs[0], addrs[i] = addrs[i], addrs[0]
}
break
}
