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Fix assertions generated by optCreateJumpTableImpliedAssertions #123240

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Merged
EgorBo merged 1 commit into from
Jan 16, 2026
Merged

Fix assertions generated by optCreateJumpTableImpliedAssertions #123240

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3 changes: 2 additions & 1 deletion src/coreclr/jit/assertionprop.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5786,7 +5786,8 @@ bool Compiler::optCreateJumpTableImpliedAssertions(BasicBlock* switchBb)
// default: %name.Length is >= 8 here%
// }
//
if ((value > 0) && !vnStore->IsVNConstant(opVN))
// NOTE: if offset != 0, we only know that "X + offset >= maxJumpIdx", which is not very useful.
if ((offset == 0) && (value > 0) && !vnStore->IsVNConstant(opVN))
{
AssertionDsc dsc = {};
dsc.assertionKind = OAK_NOT_EQUAL;
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47 changes: 47 additions & 0 deletions src/tests/JIT/Regression/JitBlue/Runtime_122254/Runtime_122254.cs
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Original file line number Diff line number Diff line change
@@ -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.

using System;
using System.Runtime.CompilerServices;
using Xunit;

public class Runtime_122254
{
[Fact]
public static void TestEntryPoint()
{
try
{
Test(new int[0]);
}
catch (InvalidOperationException)
{
return;
}
throw new InvalidOperationException();
}

[MethodImpl(MethodImplOptions.NoInlining)]
private static void Test(int[] arr)
{
int block = arr.Length;
switch (block)
{
case 2:
Console.WriteLine("2");
break;
case 3:
Console.WriteLine("3");
break;
case 4:
Console.WriteLine("4");
break;
default:
if (block == 0)
{
throw new InvalidOperationException();
}
break;
}
}
}
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