<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/118604>118604</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Clang] [CodeGen] Assertion when trying to pass a prvalue of matrix type to a function
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang:codegen,
            crash-on-valid
      </td>
    </tr>

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

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

<pre>
    This currently asserts on trunk (https://godbolt.org/z/5PzGbK39v):
```c++
using m5x5 = double __attribute__((matrix_type(5, 5)));
void f(m5x5 t) {}
void g() { f(m5x5()); }
```

The actual crash is in `llvm::ConstantExpr::getCast`, but this is probably Clang giving it bad input.

Assertion:
```console
clang++: /root/llvm-project/llvm/lib/IR/Constants.cpp:2219: 
static llvm::Constant* llvm::ConstantExpr::getCast(
    unsigned int, llvm::Constant*, llvm::Type*, bool): 
Assertion `CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!"' failed.
```

Stack trace:
```console
#0 0x0000000003bf9868 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bf9868)
 #1 0x0000000003bf756c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bf756c)
 #2 0x0000000003b44a48 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007ed970e42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007ed970e969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007ed970e42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007ed970e287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007ed970e2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007ed970e39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000003450fbb llvm::ConstantExpr::getCast(unsigned int, llvm::Constant*, llvm::Type*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3450fbb)
#10 0x0000000000d36ce1 llvm::IRBuilderBase::CreateCast(llvm::Instruction::CastOps, llvm::Value*, llvm::Type*, llvm::Twine const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd36ce1)
#11 0x0000000004374f17 clang::CodeGen::CodeGenFunction::EmitCall(clang::CodeGen::CGFunctionInfo const&, clang::CodeGen::CGCallee const&, clang::CodeGen::ReturnValueSlot, clang::CodeGen::CallArgList const&, llvm::CallBase**, bool, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4374f17)
#12 0x00000000043ffa96 clang::CodeGen::CodeGenFunction::EmitCall(clang::QualType, clang::CodeGen::CGCallee const&, clang::CallExpr const*, clang::CodeGen::ReturnValueSlot, llvm::Value*, llvm::CallBase**, clang::CodeGen::CGFunctionInfo const**) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43ffa96)
#13 0x0000000004400455 clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot, llvm::CallBase**) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4400455)
#14 0x0000000004457d34 (anonymous namespace)::ScalarExprEmitter::VisitCallExpr(clang::CallExpr const*) CGExprScalar.cpp:0:0
#15 0x000000000444bbeb clang::StmtVisitorBase<std::add_pointer, (anonymous namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) CGExprScalar.cpp:0:0
#16 0x000000000445187c clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x445187c)
#17 0x00000000043dabfe clang::CodeGen::CodeGenFunction::EmitAnyExpr(clang::Expr const*, clang::CodeGen::AggValueSlot, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43dabfe)
#18 0x00000000043fe985 clang::CodeGen::CodeGenFunction::EmitIgnoredExpr(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43fe985)
#19 0x0000000003f609d5 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f609d5)
#20 0x0000000003f68714 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f68714)
#21 0x0000000003fd1764 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3fd1764)
#22 0x0000000003fe472c clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3fe472c)
#23 0x000000000404c06a clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x404c06a)
#24 0x00000000040472f5 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x40472f5)
#25 0x00000000040476db clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x40476db)
#26 0x0000000004051ea3 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#27 0x000000000457fd56 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#28 0x0000000004570a58 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4570a58)
#29 0x0000000006522794 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6522794)
#30 0x000000000457d908 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x457d908)
#31 0x0000000004838839 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4838839)
#32 0x00000000047b86fe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47b86fe)
#33 0x000000000492374e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x492374e)
#34 0x0000000000caeaef cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcaeaef)
#35 0x0000000000ca668a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#36 0x00000000045c0b59 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#37 0x0000000003b44ef4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b44ef4)
#38 0x00000000045c114f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#39 0x00000000045873ed clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45873ed)
#40 0x00000000045884dd clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45884dd)
#41 0x000000000458f895 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x458f895)
#42 0x0000000000cab933 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcab933)
#43 0x0000000000b801d4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb801d4)
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWl1z4ygW_TXKC5WUhL4f8uA47WxmZ2tmO6neRxdCyGEbgwqQx55fvwXIllDsdDtrT23Vdrm7bQSXc869XK6QkFJ0xQm5D9KHIH28QZ1-E_L-hUqJaE1uKlHv7l_fqAK4k5JwzXYAKUWkVkBwoGXHv4MAFm9atyqIZwFcBHCxEnUlmL4TchXAxZ8BXKS___lU_T0uNwEsTbdwFmSh--AAPphPOOsU5SuwTrcpCOJHUIuuYgQsl0hrSatOk-UygEUAizXSkm6XeteSABZpAOcgNYbdJza2NoLWoDF9jTkdwBIE-UOQP-6vrawp23ro55qcDeD6HmCa7-Hs9Y0AhHWHGMASqTdAFaAcBFnI2GZtmMWzueBKI66_bFvpWlZEz5HSxgqcg6rTQBtJqQKtFBWq2A7MGeIrsKIbIwHVoEI1oLzt9J2beGZFp4JP1RNcCUaCcIaNhV7LeAYCuJBC6AAuDLLbVop_E7z_af6jVQAXz18DuNgDVne4bYN4BmFUWhPhTGmkKQbvyQVwdqT1PWVYBOEMAAA6biPNsNJGhaMm_Quv1r-2sRKCudABYzGM8GaaZ660G4PNL_UNMVoHsBAtNqPn5p_XnXU3zAKYgQDCZ74xvQDupyfbVgJsMUcBhAHMQYMoI_Xd-zB40Qh_B1oiTE76I4BxCMJtuP8TV01ZZMWIn9op9-V3Sbm2Nl-tSVgMnST6YymUlgStLfa5E9AwKQK4EK3xKRbrljIib8m2ZUISadpMPNyivVTq1i7WAC4qyveX-3CBD-G2h2dEDk30xNEEfJ5m-Bj4OSOId-1v_IWuOGIBLA6uZsJMcQ2oBswAFfpQkwQlBZib9fmVYLEhcuew_Q3xmpkZi15Dr89cmCDQ_SII7V9nP-7t56Qu85AkMIVhT8oto22RLbPkllHebW9XvHMX8J0Sd5mFbIcMgBPfYJmVDQatfpME1cvvlLHzrNvxg_V0CjfJM7BSVoJzYSd5NhjOfMOwyJsYoEpIfZ5ZO3Awm78zG1VnG4yqwWDhG4xLUmbnGbRDBoOlF2BJGjZV9ZPp7yJ57-IryFFwBM1a9zJVWMcZJtEI0fPXh46ymsgHpEiPXhKkSU9y1JMrLTu836nimenxW6t8ht8Q68hHvEeNf1BOXJK2-e_iWjiygxRe3kviPGmiHLhBvdtq8kS492PR8RHlL2uq54iZVHhy3NN-yDNvxIje_PRUT8YmIT_V-SvRneRW5hcm9Id2EWMzufqVKu2ZHgUqYsw63vhmFJaezRfRSUx-FRhZIa4Xu71LBodB32FNg8rsEg77Z4eYC8n_wimIsS-2sHDXZ2c67UdL5r1rzos4N-oKPrJeGHwUez5KwjBJ08_5yOZYf2FdTOOpmpfXxTEfdEl8XdK8jhMzKeKC79aiU4CjNVGtrQrLfqVhxJA0jI0mmvRbzjeqzlCoBPMn0-SMTWoegyz1kSVVRSpvveu1tlOKflOYK127S6iul62g3ECD8_PpHI_7-MuIp8_PYPk5VtlE76jI8flxOED2cbyLwmulQAd8CKPcT4E1qhpyPq0Z3_0Ep1NmZ6uVt6yulv4tu4F7MUn_pCw-kVqeV1xIUv-Q_zVSpUE88PFrzSYLy_oTfNySmC4Sz5HDGptJiXZfSRPE89GAmdYj5vGXa9Shjt6BPAwn5Is8Sj6xT4h1KzpeG8r_ovpNdPoFC3tY5Nkaenn795Hq5oNIv4YohvYgin8n3tRRnn1ClH3Lg6h3H0bGFQhZyAMh_369IUkOz8zCT4QTae4_RD3x6hMTFWKPBDM_xg_jP1MmXeO-o-c9qOLXSGGCwwz9SJV_iLpjZHCyY7-n8Egayqlj_TMaufah0rx8snOsBs7JhHMOmx8mu-Oc_xe5GjYD13TKNaurz3E9zfAqLLJ6OCmAfgUVphFB8bksXkX7K9mQHvOYi2vZu-OuRVLfhbauG1t6X9hBvwJK86ZOsx9Vnr1Nk0iEfF63zDW7U8KPMT5J0bVmx4QlcJj6A5Ij0IoJtBClxVixB4S_E17PBVfdel_Nnwvi0m53MAe3e1VJlkKYl94e9DuSisxeXic7C1mjyaZ6pbKwh3QA7J-9mxurMiyOxOlsvEtuCe406Zv6x0MX19UAGWD6p01FXBRxOYa5kIJrwusjOK-E0GEYEPrHK3lVZNN7Czfnsz3NxOS4lqcpXWVz7XEOLPzNtYRxnngserwDmc3hJGtaM3pkr7N1OHwDem-bDDEiiDQA42i5RsZAcbyUf0OT-n0O_DY4BxtB6-uQcCgHDumEQ5YVCOxln0evNi-MmLysEWPfCD7k5iOEJgeVxkb_FMer3GpJN8dSc-xvZikOq7S0koyMNn0xtZRWVXu1f1C8P5LAiLEK4e_Lhvu3UG7iPnTm0Vys14jX01V81HuH0xTRmtmREWAkjpaUr2zPL71rDwOWS7zdRpH7USFF8VLZ7r2EXmfTsNQSUa32lyfmEGNmKQg5um66jA44bPg4we2QAOYMrasaBTAfpILF_nngL6I64ox8-hSPNMn4cO7Is7r-TK_jL6ghbOdp-bHfrvFU0iIeAn6y7-MoShrw_xwck5LueBSUvmpFHpP6pGrWa-jdzriX0kvdk4Gmw6lT-w-6zrxyZkTsslWCpX0IpWRSzBRFUp8tyi-iUqcV-UVUHzwBep-LDxHQImqc3z_d_FkR-zD5S6Q0Yg1SRhMpm6JMT8F-HH33CoQjlcEpF_yFUl6hWrXyDOLByR5elXF_87evRPbgbSqZvX-ae2KHvnjtYZANuL3qL6yKMKoTYBBfemJnup94_07QTX0f12VcohtyH-VxHIdRmsY3b_dJmmWkLEqYNQ1sSBKHOMVJlhSIhHGK4xt6D0OYRDBMwiIuo_iO5CTCVRThuKpJGTdBEpI1ouzOSHwn5OqGKtWR-ygqsjC5YagiTNmX-yDcBxQWNVkRbt9xmpt2s7HeCn67cW9NwSB9vJH39rWxqlupIAkZVVoNc2iqmX1l0L61FqSPwHzvb_zTRzC8n_XHG-FAyx3lK6AFaJFSAIFWbhDrCBANcK_yAb1riemAwH7bvukku5-8Vkj1W1fdYbEevcbmv9xm2asALnoBNvfwPwEAAP__Ubxtig">