Add tests

src/tests/JIT/opt/Vectorization/SpanHelpers_SequenceEqual.cs

@@ -0,0 +1,45 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+public class UnrollSequenceEqualTests
+{
+    public static int Main()
+    {
+        var testMethods = typeof(UnrollSequenceEqualTests)
+            .GetMethods(BindingFlags.Static | BindingFlags.NonPublic)
+            .Where(m => m.Name.StartsWith("Test"));
+
+        foreach (MethodInfo testMethod in testMethods)
+            if (!(bool)testMethod.Invoke(null, new object[] { "0123456789ABCDEF0"u8.ToArray() }))
+                throw new InvalidOperationException($"{testMethod.Name} returned false.");
+
+        foreach (MethodInfo testMethod in testMethods)
+            if ((bool)testMethod.Invoke(null, new object[] { "123456789ABCDEF01"u8.ToArray() }))
+                throw new InvalidOperationException($"{testMethod.Name} returned true.");
+
+        return 100;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test1(byte[] data) => data.AsSpan().StartsWith("0"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test2(byte[] data) => data.AsSpan().StartsWith("01"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test3(byte[] data) => data.AsSpan().StartsWith("012"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test4(byte[] data) => data.AsSpan().StartsWith("0123"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test5(byte[] data) => data.AsSpan().StartsWith("01234"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test6(byte[] data) => data.AsSpan().StartsWith("012345"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test7(byte[] data) => data.AsSpan().StartsWith("0123456"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test8(byte[] data) => data.AsSpan().StartsWith("01234567"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test9(byte[] data) => data.AsSpan().StartsWith("012345678"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test10(byte[] data) => data.AsSpan().StartsWith("0123456789"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test11(byte[] data) => data.AsSpan().StartsWith("0123456789A"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test12(byte[] data) => data.AsSpan().StartsWith("0123456789AB"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test13(byte[] data) => data.AsSpan().StartsWith("0123456789ABC"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test14(byte[] data) => data.AsSpan().StartsWith("0123456789ABCD"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test15(byte[] data) => data.AsSpan().StartsWith("0123456789ABCDE"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test16(byte[] data) => data.AsSpan().StartsWith("0123456789ABCDEF"u8);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)] static bool Test17(byte[] data) => data.AsSpan().StartsWith("0123456789ABCDEF0"u8);
+}

src/tests/JIT/opt/Vectorization/SpanHelpers_SequenceEqual.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <Optimize>True</Optimize>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="$(MSBuildProjectName).cs" />
+  </ItemGroup>
+</Project>