JIT: Assertion failed 'm_store->TypeGet() == m_src->TypeGet()'

[jakobbotsch]

Created based on an Antigen found example.

using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics;
using System.Numerics;

public class Program
{
    public static void Main()
    {
        Foo(default, default);
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    private static Vector2 Foo(Vector128<float> v1, Vector128<float> v2)
    {
        return Vector2.Lerp(default, default, Vector128.Dot(v1, v2));
    }
}

Assert failure(PID 44604 [0x0000ae3c], Thread: 48752 [0xbe70]): Assertion failed 'm_store->TypeGet() == m_src->TypeGet()' in 'TestClass:Foo(System.Runtime.Intrinsics.Vector128`1[float],System.Runtime.Intrinsics.Vector128`1[float]):System.Numerics.Vector2' during 'Morph - Global' (IL size 31; hash 0xa3f337c0; FullOpts)

    File: C:\dev\dotnet\runtime4\src\coreclr\jit\morphblock.cpp Line: 671
    Image: C:\dev\dotnet\runtime4\artifacts\tests\coreclr\windows.x64.Checked\Tests\Core_Root\corerun.exe

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Issue Details

---

Created based on an Antigen found example.

using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics;
using System.Numerics;

public class Program
{
    public static void Main()
    {
        Foo(default, default);
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    private static Vector2 Foo(Vector128<float> v1, Vector128<float> v2)
    {
        return Vector2.Lerp(default, default, Vector128.Dot(v1, v2));
    }
}

Assert failure(PID 44604 [0x0000ae3c], Thread: 48752 [0xbe70]): Assertion failed 'm_store->TypeGet() == m_src->TypeGet()' in 'TestClass:Foo(System.Runtime.Intrinsics.Vector128`1[float],System.Runtime.Intrinsics.Vector128`1[float]):System.Numerics.Vector2' during 'Morph - Global' (IL size 31; hash 0xa3f337c0; FullOpts)

    File: C:\dev\dotnet\runtime4\src\coreclr\jit\morphblock.cpp Line: 671
    Image: C:\dev\dotnet\runtime4\artifacts\tests\coreclr\windows.x64.Checked\Tests\Core_Root\corerun.exe

Author:	jakobbotsch
Assignees:	-
Labels:	area-CodeGen-coreclr
Milestone:	-

[kunalspathak]

@jakobbotsch - This still fails on windows/x86:

https://dev.azure.com/dnceng-public/public/_build/results?buildId=390689&view=ms.vss-build-web.run-extensions-tab