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// 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 System;
using Microsoft.Xunit.Performance;
namespace Functions
{
public static partial class MathTests
{
// Tests MathF.Atan2(float, float) over 5000 iterations for the domain y: -1, +1; x: +1, -1
private const float atan2SingleDeltaX = -0.0004f;
private const float atan2SingleDeltaY = 0.0004f;
private const float atan2SingleExpectedResult = 3930.14282f;
[Benchmark(InnerIterationCount = Atan2SingleIterations)]
public static void Atan2SingleBenchmark()
{
foreach (var iteration in Benchmark.Iterations)
{
using (iteration.StartMeasurement())
{
for (int i = 0; i < Benchmark.InnerIterationCount; i++)
{
Atan2SingleTest();
}
}
}
}
public static void Atan2SingleTest()
{
var result = 0.0f; var valueX = 1.0f; var valueY = -1.0f;
for (var iteration = 0; iteration < iterations; iteration++)
{
valueX += atan2SingleDeltaX; valueY += atan2SingleDeltaY;
result += MathF.Atan2(valueY, valueX);
}
var diff = MathF.Abs(atan2SingleExpectedResult - result);
if (diff > singleEpsilon)
{
throw new Exception($"Expected Result {atan2SingleExpectedResult,10:g9}; Actual Result {result,10:g9}");
}
}
}
}
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