From 7bcbb65d7879f17b185cee9ab4ab392da0bd865f Mon Sep 17 00:00:00 2001
From: Rui Ueyama <ruiu@google.com>
Date: Wed, 11 Jun 2014 19:03:59 -0700
Subject: bytes, strings: optimize Repeat

Call copy with as large buffer as possible to reduce the
number of function calls.

benchmark                 old ns/op    new ns/op    delta
BenchmarkBytesRepeat            540          162  -70.00%
BenchmarkStringsRepeat          563          177  -68.56%

LGTM=josharian
R=golang-codereviews, josharian, dave, dvyukov
CC=golang-codereviews
https://golang.org/cl/90550043
---
 src/pkg/bytes/bytes_test.go | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/pkg/bytes/bytes_test.go')

diff --git a/src/pkg/bytes/bytes_test.go b/src/pkg/bytes/bytes_test.go
index 394dd7a443..980c41d754 100644
--- a/src/pkg/bytes/bytes_test.go
+++ b/src/pkg/bytes/bytes_test.go
@@ -1232,3 +1232,9 @@ func BenchmarkTrimSpace(b *testing.B) {
 		TrimSpace(s)
 	}
 }
+
+func BenchmarkRepeat(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Repeat([]byte("-"), 80)
+	}
+}
-- 
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