Adding perf tests for the single precision math functions in System.MathF.

1 files changed, 47 insertions, 0 deletions

diff --git a/tests/src/JIT/Performance/CodeQuality/Math/Functions/Single/ExpSingle.cs b/tests/src/JIT/Performance/CodeQuality/Math/Functions/Single/ExpSingle.cs
new file mode 100644
index 0000000000..c68812d068
--- /dev/null
+++ b/tests/src/JIT/Performance/CodeQuality/Math/Functions/Single/ExpSingle.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.Exp(float) over 5000 iterations for the domain -1, +1
+
+        private const float expSingleDelta = 0.0004f;
+        private const float expSingleExpectedResult = 5877.18125f;
+
+        [Benchmark]
+        public static void ExpSingleBenchmark()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    ExpSingleTest();
+                }
+            }
+        }
+
+        public static void ExpSingleTest()
+        {
+            var result = 0.0f; var value = -1.0f;
+
+            for (var iteration = 0; iteration < iterations; iteration++)
+            {
+                value += expSingleDelta;
+                result += MathF.Exp(value);
+            }
+
+            var diff = MathF.Abs(expSingleExpectedResult - result);
+
+            if (diff > singleEpsilon)
+            {
+                throw new Exception($"Expected Result {expSingleExpectedResult}; Actual Result {result}");
+            }
+        }
+    }
+}