unicode/utf16: add benchmarks

For #6957

Change-Id: Ic497c12f33efc933e9fe81f6cd1b2a0a01abbabf
Reviewed-on: https://go-review.googlesource.com/19820
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/unicode/utf16/utf16_test.go b/src/unicode/utf16/utf16_test.go
index 3dca472bbe2165197fa4fb213adade90ff5bf930..e5be504e080c07184db65c984c7203d97d2ea547 100644 (file)
--- a/src/unicode/utf16/utf16_test.go
+++ b/src/unicode/utf16/utf16_test.go
@@ -147,3 +147,56 @@ func TestIsSurrogate(t *testing.T) {
                }
        }
 }
+
+func BenchmarkDecodeValidASCII(b *testing.B) {
+       // "hello world"
+       data := []uint16{104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100}
+       for i := 0; i < b.N; i++ {
+               Decode(data)
+       }
+}
+
+func BenchmarkDecodeValidJapaneseChars(b *testing.B) {
+       // "日本語日本語日本語"
+       data := []uint16{26085, 26412, 35486, 26085, 26412, 35486, 26085, 26412, 35486}
+       for i := 0; i < b.N; i++ {
+               Decode(data)
+       }
+}
+
+func BenchmarkDecodeRune(b *testing.B) {
+       rs := make([]rune, 10)
+       // U+1D4D0 to U+1D4D4: MATHEMATICAL BOLD SCRIPT CAPITAL LETTERS
+       for i, u := range []rune{'𝓐', '𝓑', '𝓒', '𝓓', '𝓔'} {
+               rs[2*i], rs[2*i+1] = EncodeRune(u)
+       }
+
+       b.ResetTimer()
+       for i := 0; i < b.N; i++ {
+               for j := 0; j < 5; j++ {
+                       DecodeRune(rs[2*j], rs[2*j+1])
+               }
+       }
+}
+
+func BenchmarkEncodeValidASCII(b *testing.B) {
+       data := []rune{'h', 'e', 'l', 'l', 'o'}
+       for i := 0; i < b.N; i++ {
+               Encode(data)
+       }
+}
+
+func BenchmarkEncodeValidJapaneseChars(b *testing.B) {
+       data := []rune{'日', '本', '語'}
+       for i := 0; i < b.N; i++ {
+               Encode(data)
+       }
+}
+
+func BenchmarkEncodeRune(b *testing.B) {
+       for i := 0; i < b.N; i++ {
+               for _, u := range []rune{'𝓐', '𝓑', '𝓒', '𝓓', '𝓔'} {
+                       EncodeRune(u)
+               }
+       }
+}