blob: 43fc28b37067678942fe583428b0e0523e7f9024 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
using Microsoft.Xunit.Performance;
using System;
using System.Runtime.CompilerServices;
using Xunit;
[assembly: OptimizeForBenchmarks]
[assembly: MeasureInstructionsRetired]
namespace Benchstone.BenchI
{
public class Permutate
{
#if DEBUG
public const int Iterations = 1;
#else
public const int Iterations = 20000;
#endif
private int[] _permArray = new int[11];
private static int s_pctr;
private static
void Swap(int[] arr, int i, int j)
{
int t = arr[i];
arr[i] = arr[j];
arr[j] = t;
}
private void Initialize()
{
for (int i = 1; i <= 7; i++)
{
_permArray[i] = i - 1;
}
}
private void PermuteArray(int n)
{
int k;
s_pctr = s_pctr + 1;
if (n != 1)
{
PermuteArray(n - 1);
for (k = n - 1; k >= 1; k--)
{
Swap(_permArray, n, k);
PermuteArray(n - 1);
Swap(_permArray, n, k);
}
}
}
private bool Validate()
{
int k = 0;
for (int i = 0; i <= 6; i++)
{
for (int j = 1; j <= 7; j++)
{
if (_permArray[j] == i)
{
k = k + 1;
}
}
}
return (k == 7);
}
[MethodImpl(MethodImplOptions.NoInlining)]
private bool Bench()
{
Initialize();
for (int i = 0; i < Iterations; ++i)
{
s_pctr = 0;
PermuteArray(7);
}
bool result = Validate();
return result;
}
[Benchmark]
public static void Test()
{
Permutate P = new Permutate();
foreach (var iteration in Benchmark.Iterations)
{
using (iteration.StartMeasurement())
{
P.Bench();
}
}
}
private static bool TestBase()
{
Permutate P = new Permutate();
bool result = P.Bench();
return result;
}
public static int Main()
{
bool result = TestBase();
return (result ? 100 : -1);
}
}
}
|
