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JIT: Assertion failed genTypeSize(op1) == genTypeSize(simdBaseType) during 'Lowering nodeinfo' #113829

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@jakobbotsch

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@jakobbotsch
// Generated by Fuzzlyn v2.5 on 2025-03-23 15:10:25
// Run on X64 Windows
// Seed: 14181260275910254012-vectort,vector128,vector256,x86aes,x86avx,x86avx2,x86avx512bw,x86avx512bwvl,x86avx512cd,x86avx512cdvl,x86avx512dq,x86avx512dqvl,x86avx512f,x86avx512fvl,x86avx512fx64,x86bmi1,x86bmi1x64,x86bmi2,x86bmi2x64,x86fma,x86lzcnt,x86lzcntx64,x86pclmulqdq,x86popcnt,x86popcntx64,x86sse,x86ssex64,x86sse2,x86sse2x64,x86sse3,x86sse41,x86sse41x64,x86sse42,x86sse42x64,x86ssse3,x86x86base
// Reduced from 68.9 KiB to 0.3 KiB in 00:01:38
// Hits JIT assert in Debug:
// Assertion failed 'genTypeSize(op1) == genTypeSize(simdBaseType)' in 'Program:Main(Fuzzlyn.ExecutionServer.IRuntime)' during 'Lowering nodeinfo' (IL size 20; hash 0xade6b36b; MinOpts)
// 
//     File: D:\a\_work\1\s\src\coreclr\jit\lowerxarch.cpp Line: 4086
// 
using System.Runtime.Intrinsics;

public class C0
{
    public sbyte F4;
}

public class Program
{
    public static void Main()
    {
        var vr4 = new C0();
        Vector128.CreateScalar((short)vr4.F4);
    }
}

Bisected to #112728, cc @saucecontrol

cc @dotnet/jit-contrib

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    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIblocking-clean-ci-optionalBlocking optional rolling runsin-prThere is an active PR which will close this issue when it is merged

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