<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/150933>150933</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Crash in clang when compiling 4x4x4 vector.matrix.multiply intrinsic
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          superlopuh
      </td>
    </tr>
</table>

<pre>
    For this input:

```
; ModuleID = 'LLVMDialectModule'
source_filename = "LLVMDialectModule"

define void @matmul(ptr noalias %0, ptr noalias %1, ptr noalias %2) {
  %4 = getelementptr float, ptr %1, i64 0
  %5 = load <16 x float>, ptr %4, align 4
  %6 = getelementptr float, ptr %2, i64 0
  %7 = load <16 x float>, ptr %6, align 4
  %8 = call <16 x float> @llvm.matrix.multiply.v16f32.v16f32.v16f32(<16 x float> %5, <16 x float> %7, i32 4, i32 4, i32 4)
  %9 = getelementptr float, ptr %0, i64 0
  store <16 x float> %8, ptr %9, align 4
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <16 x float> @llvm.matrix.multiply.v16f32.v16f32.v16f32(<16 x float>, <16 x float>, i32 immarg, i32 immarg, i32 immarg) #0

attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!llvm.module.flags = !{!0}

!0 = !{i32 2, !"Debug Info Version", i32 3}
```

I get the following crash:
```
❯ clang-20 -S -target x86_64-unknown-linux-gnu -o build/matmul_rowmaj/4x4x4/vector_intrinsic.x86.S build/matmul_rowmaj/4x4x4/vector_intrinsic.ll            13:37:18
warning: overriding the module target triple with x86_64-unknown-linux-gnu [-Woverride-module]
fatal error: error in backend: Do not know how to split the result of this operator!

PLEASE submit a bug report to https://github.com/Homebrew/homebrew-core/issues and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: clang-20 -S -target x86_64-unknown-linux-gnu -o build/matmul_rowmaj/4x4x4/vector_intrinsic.x86.S build/matmul_rowmaj/4x4x4/vector_intrinsic.ll
1.      Code generation
2.      Running pass 'Function Pass Manager' on module 'build/matmul_rowmaj/4x4x4/vector_intrinsic.ll'.
3.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@matmul'
 #0 0x0000000117df0dc0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x3d90dc0)
 #1 0x0000000114177090 llvm::sys::CleanupOnSignal(unsigned long) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x117090)
 #2 0x0000000117dcb874 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x3d6b874)
 #3 0x0000000117dcb820 llvm::CrashRecoveryContext::HandleExit(int) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x3d6b820)
 #4 0x0000000117df027c llvm::sys::Process::Exit(int, bool) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x3d9027c)
 #5 0x000000010223d2a8 std::__1::deque<llvm::Region*, std::__1::allocator<llvm::Region*>>::~deque[abi:nn190102]() (/opt/homebrew/Cellar/llvm/20.1.8/bin/clang-20+0x10000d2a8)
 #6 0x0000000117dceeac llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x3d6eeac)
 #7 0x0000000117dced70 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x3d6ed70)
 #8 0x0000000114959ba4 llvm::DAGTypeLegalizer::SplitVectorResult(llvm::SDNode*, unsigned int) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x8f9ba4)
 #9 0x000000011493f940 llvm::DAGTypeLegalizer::run() (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x8df940)
#10 0x0000000114943b90 llvm::SelectionDAG::LegalizeTypes() (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x8e3b90)
#11 0x0000000114a6fcdc llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0xa0fcdc)
#12 0x0000000114a6de60 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0xa0de60)
#13 0x0000000114a6c0a0 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0xa0c0a0)
#14 0x0000000114a6a954 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0xa0a954)
#15 0x00000001145c943c llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x56943c)
#16 0x00000001143274e0 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x2c74e0)
#17 0x0000000114333118 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x2d3118)
#18 0x000000011432985c llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x2c985c)
#19 0x0000000107bbce8c clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x1204e8c)
#20 0x0000000107ea88bc clang::CodeGenAction::ExecuteAction() (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x14f08bc)
#21 0x0000000108473ee0 clang::FrontendAction::Execute() (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x1abbee0)
#22 0x000000010840d1e8 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x1a551e8)
#23 0x00000001084a6cc8 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x1aeecc8)
#24 0x0000000102235370 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/homebrew/Cellar/llvm/20.1.8/bin/clang-20+0x100005370)
#25 0x0000000102233564 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) (/opt/homebrew/Cellar/llvm/20.1.8/bin/clang-20+0x100003564)
#26 0x000000010813dea0 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__1::optional<llvm::StringRef>>, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>*, bool*) const::$_0>(long) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x1785ea0)
#27 0x00000001140d12fc llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libLLVM.dylib+0x712fc)
#28 0x000000010813db4c clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__1::optional<llvm::StringRef>>, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>*, bool*) const (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x1785b4c)
#29 0x0000000108108a84 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x1750a84)
#30 0x0000000108124914 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*>>&) (/opt/homebrew/Cellar/llvm/20.1.8/lib/libclang-cpp.dylib+0x176c914)
#31 0x0000000102232548 clang_main(int, char**, llvm::ToolContext const&) (/opt/homebrew/Cellar/llvm/20.1.8/bin/clang-20+0x100002548)
#32 0x000000010223d19c main (/opt/homebrew/Cellar/llvm/20.1.8/bin/clang-20+0x10000d19c)
#33 0x0000000192d4eb98 
clang-20: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Homebrew clang version 20.1.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/homebrew/Cellar/llvm/20.1.8/bin
clang-20: note: diagnostic msg: Error generating preprocessed source(s) - no preprocessable inputs.
```

Am I using it wrong? Is it a problem with the target triple I'm providing?
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzsWktz27iW_jXwBmUVCFIiufCClqxcVyWTVJzqmZ0KBI4k3AYBXhD0Yxbz26cAkiYpyel0x5npxU25uikSj-87-HDOwYM1jTxogBu0vEXLzRVr3dHYm6atwSpTt8er0oiXm62x2B1lg6WuW4fiApHwtyL9HylQfIs_GdEquN9gFG8wounHj7992kimgLvuE6IpIkVjWstht5cKNKugL00vlKZdPwL2UgN-NFJglJCKuapViGa1s1gbpiRrMKJLgugan7yLLryjiOYYpbeIFNj_TgKCAzhQUIF2vvheGeaGukM7cpVgMtRahlrKMIFRvI5W-LmvFN9N6iX-mSl50DgZaq5-oD961l_6Q_2tLvSXhZqcKXVW05tTqcdqUTFn5fOiapWTtXpZPEarfUzn_0M0O69Pl0vf5aUPaeAQU5xcesgHePkPmIPMzdE4Y-Fin9mkUn5qCwsuiMirKt30Go5v8bbV3EmjceGcbVBcYG28uUrGf8fa7C0A1qZ50Rxr0-onqQVuauCtYo6VCvCTVMqCa63GFVTGviCaaaOhYymAK3YR788Z_5LdBwPLqmL28P1fOUY0Jp0ZmHNWlq2DJrzs5mR6-46GwKPJadTRDrN8sVfs0PROIPLTkkZkWpZMvnn4YWr4n5RuoGwP-F7vDf4NbCON9j6jpxn3jUydFCnuvdKwOwLeG6XMk9QHzC1rjr1Xm5a-oyjfoGKLuWL6cE0Jvn7A145Z38RzttqtkutW_67Nk75WUrfP1wfd4muDy1Yqgei281Q7a54q9k9Et8lz8pwgun0E7ozdSe2s1I3ki-dstXj489WUwpN_UYziIk5RXEQZIsUTs1rqg5ezeQRrpfBcPfPO8Lgn4qysw9C549uk0PL2-j_7ZuC6awAtvX33zDGFwVpjfVfhAUuNvWZAC_9uY7A2Dvs28dE8YWdwUyvZDYOFplUOm30XYUwNljlj_QCHAfvy8a54uMNNW1bSYYb9iFuojXW-naNztZ-xiG4R3R6kO7blgpsK0e0_TAWlhSdEt8f-8ZobC4huZdO00GCmBZaaq1ZAgBJ0EIA7yzgEV2KhtoZD04DAXeAKXkULzJrGcMkcCGxbjRtuZe0WiBQPzk8X0VZ1pymy6MbnizUHyyrM7KH1ji54mr-vtBApoh752gjAB9B-aPwkIwXtv3xttRcZrlnjPUf66kq_-BefmGYHsIim2OhBdoimfwUNTb1t4zf6_a9shTfFh2sU322KD_heN862HZIH8ClF8A0Bxn6A6LORMZvwmUnn-8gz6f5FUSr2RHCCvb_ygxkXzUvTPXyxUrsw1N86sWRjIcuedqZxFliFaAjJUrvO4WaIbk3tJqJEdLsGpZhFdBuaoFtKFtHCl1Sy7P7rk6OFeAm_b8lzLHKPq4-iiMbRFHUSpSnJL6JeK2C6rT_rB3nQzCdRrQ4poMDK6MN7YowiD2KESOeG5WWWJr4zpo1-qUzbYJ8NNnUwZt7D9TPyK3DveV7WRjt4dvdVrbqv_2BaKAhlEM2Cidf4l_GJxcpDHgnFZ4To1OaXsE9x3z1LN8B-Z5R0YvbkVM805Zf1HNxc92OKbY1LY9R7q5emfMS4nGAklMaCsgw3TnRgdruoexDwrxZQvB7Rf4VDmNiFh3legSlleIgmlyvFd-HPv_yfrvHlLSsliguto9xj8THOs_7z5EupEd0O7r2bEZ6g5zYyX51oCIBNR6cLdLsQY3ddjJ36mW9Pfl3EjW5c72fef6hWHtIIOD0FLFLydwMs0on-s5lnzJd5yZIJ4E3x4dtLDR_hwJT8b7Dd2wefnvwWotDXkJ_MWDxs_sMI6FX36m_eeSJne4905JHPecT7PCF_yMO2-i_K901YwnfcwfJxh8xhJXE5CzyvwXdTfOjeDAg92ua9wYHvfgQ3j4psteeCvwHu_gH6qOKTnQ-gCy3uKuk87vcFyYiHMYKkJyAFrN6y4Aiye1sodcsayW-V4b83M42-JmLjZHtPCh7kSCE-ocAJ-2MKttWf9SfGj1LDgHZG4ezbO3PwKEcOyQkHli-T73DwMuYvfxMmHuvIZDljsuR5Ek9VfwLGJ-oTGhfx_yLgy5WHNgKfBcMkpmkCUxltv3isw5ri_wcy5R7UCDmdQ47jKMp-APKwwTnVSP_qfeEKD2iEm51YOM-WU2moiagnwMeMu4snvxo097BG0NPIR9Ky5JDxbt3cgYBKuttut-Fz6-rWB-vJ57WpaqnA-jUh0xz6xGNWInj8z7UXTNN_n0x9vwo9fIX9_PXAvThprYdS9PKbVrnXzraNfISvsF9r98XNE9PHfT8Tt1LBw0vjoOq39M5T21bLf7Wwq0-a8CvP-slKB7th_XmptoA9a5XbCVDg4A9a6LLkiyTXRjdt5Vf4xU8poEuTeV1P14-UJJCNOqBkpgNgWVbyC8PYG75fxwBvHQxj8XNx_CLIZE-ycgJymnKQLEljADIFubV-JfgqjynKX4KPlSVMHBalc3xERJDh782Wi3Z8m9BPuoLLHJbLCEYvRuM5B7bifMahRztSefSrwDPk547hF4iYAXA-wZ6cLHWXcUow59GuYnLuWwtr2Yv3OvGaH5kdErlimIyzd3TdnWz8NQpvrVU9uBH66So9Xq4SPNh6HX0LK7npMqliSnWLqC6CXOBx4mp9G_1WyU8lrm8R8pBHQquZjqJYACPdKeOIaNgt3NkwEt0ZZJior1sHwwnJbq89x1FgwsrHIeyv19HaVBXT4nTOXxzxc5dtQnRiauasx9D06qTPa5Z-ieCdeTgNCINwuaD_snOWSdcM5d5qc7qzMhT0ZYtxTR-U2A1iqIJosiOhUPbTW3MXp1qaLWGS0dN5bkZERPf8h_bnvrb6ge1BvcxG5_tKeMf8J_VARxrZqUrLZBb2_q2yTmXvr6YymQxDPh8GkrEseXMYQmRhZxF-GJtZGDqp6AvMdsh-rGhxsp_2S0yyJCwb_efsqIRkEU3y6E2TbCbPs_h8ITC_ZcqzxPwswJxLqGbSq6ffyf5RW_Y6-wW5TLrieTSxYXQSVOky6XOZISMYoIcJVfTi_78LmR7QCJee7tRHOcce6Pvtj0f5OOtmZyw5FQmUeYYRKV7rDUfOr2epeN8npJj3o7pnUoHoDrjhWXozCcAp8ZDbBvD1YziRBsBykil6BMMRct_yY3fHAPccSPEtnNf6rt86svWFjhaYwJURYecL16aRz4gUIe1UCsRGBvR_2npzK2jjF3IFFpIdtGmc5Lhqwun_XTiSH45v9eHyoXbWeNVcY20m38OljnDpq1mc36UoKnyP28Y3KR1-sj6qx1t83-BwUl9bUyqoOsO74-mFg3tE08oXegw3E1C8vRI3scjjnF3BTZT65HOV5tHV8SbLV0tSEsJJTEvGMppTHrGEMiEgFgm5kjeU0CVJqfdCqzhacMrIagVECNinmVihhEDFpFqEmyfGHq7CHYCbaEnyOL5SrATVhFtwlHZOglK03FzZG1_humwPDUqIko1rxiacdApuQh6Bpe5F8nQE7aVXS-UNE460cXegfXrRB78ecF-1Vt185y5DP_wBS23NP4G712sMiG57Fo839H8DAAD__1u0AEA">