mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-10 03:54:48 +00:00
191 lines
4.4 KiB
Go
191 lines
4.4 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime_test
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import "testing"
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const N = 20
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func BenchmarkAppend(b *testing.B) {
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b.StopTimer()
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x := make([]int, 0, N)
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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x = x[0:0]
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for j := 0; j < N; j++ {
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x = append(x, j)
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}
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}
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}
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func BenchmarkAppendGrowByte(b *testing.B) {
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for i := 0; i < b.N; i++ {
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var x []byte
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for j := 0; j < 1<<20; j++ {
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x = append(x, byte(j))
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}
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}
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}
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func BenchmarkAppendGrowString(b *testing.B) {
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var s string
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for i := 0; i < b.N; i++ {
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var x []string
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for j := 0; j < 1<<20; j++ {
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x = append(x, s)
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}
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}
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}
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func benchmarkAppendBytes(b *testing.B, length int) {
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b.StopTimer()
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x := make([]byte, 0, N)
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y := make([]byte, length)
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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x = x[0:0]
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x = append(x, y...)
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}
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}
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func BenchmarkAppend1Byte(b *testing.B) {
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benchmarkAppendBytes(b, 1)
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}
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func BenchmarkAppend4Bytes(b *testing.B) {
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benchmarkAppendBytes(b, 4)
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}
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func BenchmarkAppend7Bytes(b *testing.B) {
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benchmarkAppendBytes(b, 7)
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}
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func BenchmarkAppend8Bytes(b *testing.B) {
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benchmarkAppendBytes(b, 8)
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}
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func BenchmarkAppend15Bytes(b *testing.B) {
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benchmarkAppendBytes(b, 15)
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}
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func BenchmarkAppend16Bytes(b *testing.B) {
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benchmarkAppendBytes(b, 16)
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}
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func BenchmarkAppend32Bytes(b *testing.B) {
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benchmarkAppendBytes(b, 32)
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}
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func benchmarkAppendStr(b *testing.B, str string) {
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b.StopTimer()
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x := make([]byte, 0, N)
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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x = x[0:0]
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x = append(x, str...)
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}
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}
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func BenchmarkAppendStr1Byte(b *testing.B) {
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benchmarkAppendStr(b, "1")
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}
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func BenchmarkAppendStr4Bytes(b *testing.B) {
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benchmarkAppendStr(b, "1234")
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}
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func BenchmarkAppendStr8Bytes(b *testing.B) {
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benchmarkAppendStr(b, "12345678")
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}
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func BenchmarkAppendStr16Bytes(b *testing.B) {
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benchmarkAppendStr(b, "1234567890123456")
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}
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func BenchmarkAppendStr32Bytes(b *testing.B) {
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benchmarkAppendStr(b, "12345678901234567890123456789012")
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}
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func BenchmarkAppendSpecialCase(b *testing.B) {
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b.StopTimer()
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x := make([]int, 0, N)
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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x = x[0:0]
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for j := 0; j < N; j++ {
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if len(x) < cap(x) {
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x = x[:len(x)+1]
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x[len(x)-1] = j
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} else {
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x = append(x, j)
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}
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}
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}
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}
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var x []int
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func f() int {
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x[:1][0] = 3
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return 2
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}
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func TestSideEffectOrder(t *testing.T) {
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x = make([]int, 0, 10)
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x = append(x, 1, f())
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if x[0] != 1 || x[1] != 2 {
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t.Error("append failed: ", x[0], x[1])
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}
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}
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func TestAppendOverlap(t *testing.T) {
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x := []byte("1234")
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x = append(x[1:], x...) // p > q in runtime·appendslice.
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got := string(x)
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want := "2341234"
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if got != want {
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t.Errorf("overlap failed: got %q want %q", got, want)
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}
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}
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func benchmarkCopySlice(b *testing.B, l int) {
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s := make([]byte, l)
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buf := make([]byte, 4096)
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var n int
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for i := 0; i < b.N; i++ {
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n = copy(buf, s)
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}
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b.SetBytes(int64(n))
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}
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func benchmarkCopyStr(b *testing.B, l int) {
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s := string(make([]byte, l))
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buf := make([]byte, 4096)
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var n int
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for i := 0; i < b.N; i++ {
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n = copy(buf, s)
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}
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b.SetBytes(int64(n))
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}
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func BenchmarkCopy1Byte(b *testing.B) { benchmarkCopySlice(b, 1) }
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func BenchmarkCopy2Byte(b *testing.B) { benchmarkCopySlice(b, 2) }
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func BenchmarkCopy4Byte(b *testing.B) { benchmarkCopySlice(b, 4) }
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func BenchmarkCopy8Byte(b *testing.B) { benchmarkCopySlice(b, 8) }
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func BenchmarkCopy12Byte(b *testing.B) { benchmarkCopySlice(b, 12) }
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func BenchmarkCopy16Byte(b *testing.B) { benchmarkCopySlice(b, 16) }
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func BenchmarkCopy32Byte(b *testing.B) { benchmarkCopySlice(b, 32) }
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func BenchmarkCopy128Byte(b *testing.B) { benchmarkCopySlice(b, 128) }
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func BenchmarkCopy1024Byte(b *testing.B) { benchmarkCopySlice(b, 1024) }
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func BenchmarkCopy1String(b *testing.B) { benchmarkCopyStr(b, 1) }
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func BenchmarkCopy2String(b *testing.B) { benchmarkCopyStr(b, 2) }
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func BenchmarkCopy4String(b *testing.B) { benchmarkCopyStr(b, 4) }
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func BenchmarkCopy8String(b *testing.B) { benchmarkCopyStr(b, 8) }
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func BenchmarkCopy12String(b *testing.B) { benchmarkCopyStr(b, 12) }
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func BenchmarkCopy16String(b *testing.B) { benchmarkCopyStr(b, 16) }
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func BenchmarkCopy32String(b *testing.B) { benchmarkCopyStr(b, 32) }
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func BenchmarkCopy128String(b *testing.B) { benchmarkCopyStr(b, 128) }
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func BenchmarkCopy1024String(b *testing.B) { benchmarkCopyStr(b, 1024) }
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