JIT: [arm32] Assertion failed 'baseRegUsed == reg2' during 'Generate code'

[jakobbotsch]

// Generated by Fuzzlyn v2.1 on 2024-07-28 20:48:11
// Run on Arm Linux
// Seed: 7638843082097772896
// Reduced from 1010.6 KiB to 5.3 KiB in 00:18:13
// Hits JIT assert in Release:
// Assertion failed 'baseRegUsed == reg2' in 'Program:M48(S0,S3,S2,S2)' during 'Generate code' (IL size 2164; hash 0x03983244; FullOpts)
// 
//     File: /__w/1/s/src/coreclr/jit/emitarm.cpp Line: 3919
// 
using System;
using System.Runtime.CompilerServices;

public struct S0
{
    public ulong F0;
    public int F1;
    public long F2;
    public uint F3;
    public byte F4;
    public float F5;
    public sbyte F6;
    public double F7;
    public sbyte F8;
}

public struct S1
{
    public double F0;
    public short F1;
    public bool F2;
    public S0 F3;
    public sbyte F4;
    public ushort F5;
    public ulong F6;
    public int F7;
    public S0 F8;
}

public struct S2
{
    public double F0;
    public S0 F1;
    public S1 F2;
    public ushort F4;
    public S2(S1 f2)
    {
        F2 = f2;
    }
}

public class C0
{
}

public struct S3
{
    public double F0;
    public float F1;
    public ushort F2;
    public long F3;
    public S1 F4;
    public S2 F5;
    public S2 F6;
    public uint F7;
    public S2 F8;
    public S3(S2 f5, S2 f8) : this()
    {
        F5 = f5;
        F8 = f8;
    }
}

public struct S4
{
    public double F0;
    public double F1;
    public float F2;
    public ulong F3;
    public bool F4;
    public int F5;
    public bool F6;
    public S3 F7;
    public float F8;
    public S4(S3 f7)
    {
        F7 = f7;
    }
}

public class Program
{
    public static IRuntime s_rt;
    public static S4 s_2;
    public static S4 s_3;
    public static S4[][] s_6;
    public static S3[] s_23 = new S3[]
    {
        new S3(new S2(new S1()), new S2(new S1()))
    };
    public static void Main()
    {
        var vr8 = new S4(new S3(new S2(new S1()), new S2(new S1())));
        var vr9 = s_23[0].F6.F1;
        var vr13 = s_2.F7;
        var vr14 = vr8.F7.F6;
        var vr15 = vr8.F7.F6;
        M48(vr9, vr13, vr14, vr15);
    }

    public static void M48(S0 argThis, S3 arg0, S2 arg1, S2 arg2)
    {
        arg2.F2.F0 = arg2.F2.F0;
        S4 var1 = new S4(new S3(new S2(new S1()), new S2(new S1())));
        var1.F7.F5.F2.F8.F5 = s_6[0][0].F7.F8.F2.F3.F5;
        var vr2 = new C0();
        M49(0, vr2, ref arg2.F2.F1, ref s_3.F7, ref arg1.F1.F8);
        S4 var2 = var1;
        s_rt.WriteLine(System.BitConverter.DoubleToUInt64Bits(var2.F7.F0));
        s_rt.WriteLine(System.BitConverter.SingleToUInt32Bits(var2.F7.F1));
        s_rt.WriteLine(var2.F7.F2);
        s_rt.WriteLine(var2.F7.F3);
        s_rt.WriteLine(System.BitConverter.DoubleToUInt64Bits(var2.F7.F4.F0));
        s_rt.WriteLine(var2.F7.F4.F1);
        s_rt.WriteLine(var2.F7.F4.F2);
        s_rt.WriteLine(var2.F7.F4.F3.F0);
        s_rt.WriteLine(var2.F7.F4.F3.F1);
        s_rt.WriteLine(var2.F7.F4.F3.F2);
        s_rt.WriteLine(var2.F7.F4.F3.F3);
        s_rt.WriteLine(var2.F7.F4.F3.F4);
        s_rt.WriteLine(System.BitConverter.SingleToUInt32Bits(var2.F7.F4.F3.F5));
        s_rt.WriteLine(var2.F7.F4.F3.F6);
        s_rt.WriteLine(System.BitConverter.DoubleToUInt64Bits(var2.F7.F4.F3.F7));
        s_rt.WriteLine(var2.F7.F4.F3.F8);
        s_rt.WriteLine(var2.F7.F4.F4);
        s_rt.WriteLine(var2.F7.F4.F5);
        s_rt.WriteLine(var2.F7.F4.F6);
        s_rt.WriteLine(var2.F7.F4.F7);
        s_rt.WriteLine(var2.F7.F4.F8.F0);
        s_rt.WriteLine(var2.F7.F4.F8.F1);
        s_rt.WriteLine(var2.F7.F4.F8.F2);
        s_rt.WriteLine(var2.F7.F4.F8.F3);
        s_rt.WriteLine(var2.F7.F4.F8.F4);
        s_rt.WriteLine(System.BitConverter.SingleToUInt32Bits(var2.F7.F4.F8.F5));
        s_rt.WriteLine(var2.F7.F4.F8.F6);
        s_rt.WriteLine(System.BitConverter.DoubleToUInt64Bits(var2.F7.F4.F8.F7));
        s_rt.WriteLine(var2.F7.F4.F8.F8);
        s_rt.WriteLine(System.BitConverter.DoubleToUInt64Bits(var2.F7.F5.F0));
        s_rt.WriteLine(var2.F7.F5.F1.F0);
        s_rt.WriteLine(var2.F7.F5.F1.F1);
        s_rt.WriteLine(var2.F7.F5.F1.F2);
        s_rt.WriteLine(var2.F7.F5.F1.F3);
        s_rt.WriteLine(var2.F7.F5.F1.F4);
        s_rt.WriteLine(System.BitConverter.SingleToUInt32Bits(var2.F7.F5.F1.F5));
        s_rt.WriteLine(var2.F7.F5.F1.F6);
        s_rt.WriteLine(System.BitConverter.DoubleToUInt64Bits(var2.F7.F5.F1.F7));
        s_rt.WriteLine(var2.F7.F5.F1.F8);
        s_rt.WriteLine(System.BitConverter.DoubleToUInt64Bits(var2.F7.F5.F2.F0));
        s_rt.WriteLine(var2.F7.F5.F2.F1);
        s_rt.WriteLine(var2.F7.F5.F2.F2);
        s_rt.WriteLine(var2.F7.F5.F2.F3.F0);
        s_rt.WriteLine(var2.F7.F5.F2.F3.F1);
        s_rt.WriteLine(var2.F7.F5.F2.F3.F2);
        s_rt.WriteLine(var2.F7.F5.F2.F3.F3);
        s_rt.WriteLine(var2.F7.F5.F2.F3.F4);
        s_rt.WriteLine(System.BitConverter.SingleToUInt32Bits(var2.F7.F5.F2.F3.F5));
        s_rt.WriteLine(var2.F7.F5.F2.F3.F6);
        s_rt.WriteLine(System.BitConverter.DoubleToUInt64Bits(var2.F7.F5.F2.F3.F7));
        s_rt.WriteLine(var2.F7.F5.F2.F3.F8);
        s_rt.WriteLine(var2.F7.F5.F2.F4);
        s_rt.WriteLine(var2.F7.F5.F2.F5);
        s_rt.WriteLine(var2.F7.F5.F2.F6);
        s_rt.WriteLine(var2.F7.F5.F2.F7);
        s_rt.WriteLine(var2.F7.F5.F2.F8.F0);
    }

    public static void M49(short arg0, C0 arg2, ref short arg3, ref S3 arg4, ref sbyte arg5)
    {
        s_rt.WriteLine(arg0);
    }
}

public interface IRuntime
{
    void WriteLine<T>(T value);
}

public class Runtime : IRuntime
{
    public void WriteLine<T>(T value) => System.Console.WriteLine(value);
}

Attached an SPMI context captured on 0912e94.
3D8307E1.zip

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