1 files changed, 47 insertions, 0 deletions
diff --git a/tests/src/JIT/Performance/CodeQuality/Math/Functions/Single/AcosSingle.cs b/tests/src/JIT/Performance/CodeQuality/Math/Functions/Single/AcosSingle.cs
new file mode 100644
index 0000000000..b958cc1bb4
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+++ b/tests/src/JIT/Performance/CodeQuality/Math/Functions/Single/AcosSingle.cs
@@ -0,0 +1,47 @@
+// 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.Acos(float) over 5000 iterations for the domain -1, +1
+
+        private const float acosSingleDelta = 0.0004f;
+        private const float acosSingleExpectedResult = 7852.41084f;
+
+        [Benchmark]
+        public static void AcosSingleBenchmark()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    AcosSingleTest();
+                }
+            }
+        }
+
+        public static void AcosSingleTest()
+        {
+            var result = 0.0f; var value = -1.0f;
+
+            for (var iteration = 0; iteration < iterations; iteration++)
+            {
+                value += acosSingleDelta;
+                result += MathF.Acos(value);
+            }
+
+            var diff = MathF.Abs(acosSingleExpectedResult - result);
+
+            if (diff > singleEpsilon)
+            {
+                throw new Exception($"Expected Result {acosSingleExpectedResult,10:g9}; Actual Result {result,10:g9}");
+            }
+        }
+    }
+}