const bool isSingleILStoreLocal =
!lvaTable[lclNum].lvHasMultipleILStoreOp && !lvaTable[lclNum].lvHasLdAddrOp;
- if (isSingleILStoreLocal)
+ // Conservative check that there is just one
+ // definition that reaches this store.
+ const bool hasSingleReachingDef = (block->bbStackDepthOnEntry() == 0);
+
+ if (isSingleILStoreLocal && hasSingleReachingDef)
{
lvaUpdateClass(lclNum, op1, clsHnd);
}
--- /dev/null
+// 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;
+
+class B
+{
+ public virtual string F() { return "B"; }
+}
+
+sealed class D : B
+{
+ public override string F() { return "D"; }
+}
+
+sealed class E : B
+{
+ public override string F() { return "E"; }
+}
+
+class X
+{
+ public static int Main(string[] args)
+ {
+ // When optimizing IL, CSC will leave the newobj's on the stack
+ // across the branches to the common def point.
+ B b1 = (args.Length > 0) ? (B)new E() : (B)new D();
+ B b2 = null;
+
+ // Conditional flow here to forces b1 to a local instead of
+ // remaining on the stack. So we have a single def point with
+ // two reaching values.
+ if (args.Length > 0)
+ {
+ b2 = new D();
+ }
+ else
+ {
+ b2 = new E();
+ }
+
+ // We should not be able to devirtualize either call.
+ return b2.F()[0] + b1.F()[0] - 37;
+ }
+}
--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+ <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+ <PropertyGroup>
+ <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+ <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+ <AssemblyName>$(MSBuildProjectName)</AssemblyName>
+ <SchemaVersion>2.0</SchemaVersion>
+ <ProjectGuid>{95DFC527-4DC1-495E-97D7-E94EE1F7140D}</ProjectGuid>
+ <OutputType>Exe</OutputType>
+ <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+ <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+ </PropertyGroup>
+ <!-- Default configurations to help VS understand the configurations -->
+ <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+ </PropertyGroup>
+ <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+ </PropertyGroup>
+ <ItemGroup>
+ <CodeAnalysisDependentAssemblyPaths Condition=" '$(VS100COMNTOOLS)' != '' " Include="$(VS100COMNTOOLS)..\IDE\PrivateAssemblies">
+ <Visible>False</Visible>
+ </CodeAnalysisDependentAssemblyPaths>
+ </ItemGroup>
+ <PropertyGroup>
+ <DebugType>None</DebugType>
+ <Optimize>True</Optimize>
+ </PropertyGroup>
+ <ItemGroup>
+ <Compile Include="GitHub_10858.cs" />
+ </ItemGroup>
+ <ItemGroup>
+ <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+ </ItemGroup>
+ <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+ <PropertyGroup Condition=" '$(MsBuildProjectDirOverride)' != '' ">
+ </PropertyGroup>
+</Project>