<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/82859>82859</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            "Type punning" some aarch64 SVE via pointers causes an internal compiler error
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    Take:
```
#include <arm_sve.h>

svint8_t f(svuint8x4_t s) {
        return *reinterpret_cast<svint8_t*>(&s);
}
```

Will cause an internal compile error:
```
fatal error: error in backend: Invalid size request on a scalable vector.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /opt/compiler-explorer/clang-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -S -target aarch64-linux-gnu --gcc-toolchain=/opt/compiler-explorer/arm64/gcc-12.2.0/aarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/arm64/gcc-12.2.0/aarch64-unknown-linux-gnu/aarch64-unknown-linux-gnu/sysroot -fcolor-diagnostics -fno-crash-diagnostics -march=armv9-a+sve2 -O1 <source>
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module '<source>'.
4.      Running pass 'AArch64 Instruction Selection' on function '@_Z1f11svuint8x4_t'
 #0 0x0000000003624838 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3624838)
 #1 0x0000000003622984 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3622984)
 #2 0x0000000003570323 llvm::CrashRecoveryContext::HandleExit(int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3570323)
 #3 0x000000000361a36e llvm::sys::Process::Exit(int, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x361a36e)
 #4 0x0000000000c22476 (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc22476)
 #5 0x0000000003579373 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3579373)
 #6 0x00000000035794d8 (/opt/compiler-explorer/clang-trunk/bin/clang+++0x35794d8)
 #7 0x00000000035c8a4d (/opt/compiler-explorer/clang-trunk/bin/clang+++0x35c8a4d)
 #8 0x00000000035c8a6c llvm::TypeSize::operator unsigned long() const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x35c8a6c)
 #9 0x000000000465b796 llvm::SelectionDAGBuilder::EmitFuncArgumentDbgValue(llvm::Value const*, llvm::DILocalVariable*, llvm::DIExpression*, llvm::DILocation*, llvm::SelectionDAGBuilder::FuncArgumentDbgValueKind, llvm::SDValue const&)::'lambda0'(llvm::ArrayRef<std::pair<unsigned int, llvm::TypeSize>>)::operator()(llvm::ArrayRef<std::pair<unsigned int, llvm::TypeSize>>) const SelectionDAGBuilder.cpp:0:0
#10 0x0000000004674246 llvm::SelectionDAGBuilder::EmitFuncArgumentDbgValue(llvm::Value const*, llvm::DILocalVariable*, llvm::DIExpression*, llvm::DILocation*, llvm::SelectionDAGBuilder::FuncArgumentDbgValueKind, llvm::SDValue const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4674246)
#11 0x00000000046750e1 llvm::SelectionDAGBuilder::handleDebugValue(llvm::ArrayRef<llvm::Value const*>, llvm::DILocalVariable*, llvm::DIExpression*, llvm::DebugLoc, unsigned int, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x46750e1)
#12 0x0000000004679567 llvm::SelectionDAGBuilder::visitDbgInfo(llvm::Instruction const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4679567)
#13 0x00000000046b48d9 llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x46b48d9)
#14 0x000000000472dd16 llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void, true>, false, true>, llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void, true>, false, true>, bool&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x472dd16)
#15 0x000000000472f348 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x472f348)
#16 0x0000000004731b29 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#17 0x0000000002ab83b0 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#18 0x0000000002fe9a52 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x2fe9a52)
#19 0x0000000002fe9bd1 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x2fe9bd1)
#20 0x0000000002feb7f0 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x2feb7f0)
#21 0x0000000003892149 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3892149)
#22 0x0000000003e6cfb1 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3e6cfb1)
#23 0x0000000005cf7719 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5cf7719)
#24 0x0000000003e6c415 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3e6c415)
#25 0x0000000004100a51 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4100a51)
#26 0x000000000407d00b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x407d00b)
#27 0x00000000041e2c33 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x41e2c33)
#28 0x0000000000c242a6 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc242a6)
#29 0x0000000000c1cbdd ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#30 0x0000000003eb39f9 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
#31 0x0000000003570223 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3570223)
#32 0x0000000003eb3c19 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
#33 0x0000000003e7b9f7 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3e7b9f7)
#34 0x0000000003e7c3ad clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3e7c3ad)
#35 0x0000000003e8610c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3e8610c)
#36 0x0000000000c21521 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc21521)
#37 0x0000000000b18064 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xb18064)
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzsWl9v2zgS_zTKC2FDomRLesiDYye73euiRZ3rAfdiUNTI5oUitSTlJPvpD9QfW1TtNLunLg64K5rEJqnhj7-Z4QyHIlqzvQC49RZ33mJzQ2pzkOq2YkI_MXKTyfz19pE8gReuPH_j-Stv6Xf_2684ZILyOgfkhWuiyp0-wvzghfddf_NbH5kwyc6gwsOJPtb220u0M0h7OEVefNcPThWYWgnk4ZUCJgyoSoHZUaKNF657MR5e2Qlw4uGlleCFvYB4cxll8_sfjHNESa0BEYEa6YJwRGVZMQ4IlJLq2joLYgg_DWk_ICZQRugTiNy2fRBHwlmONPsdkILfatAGSYEI0pRwknFAR6BGqnkr8vPH-9X2Huk6K5lBBGX1HimopDLISHQwptIWDX7w8MOemUOdzaksPfzA-bH_M6uU_BdQ4-EHpnUN2sMPiIgc9UoxB0BUEX1okBpFKHh4jSoFlZIUtIYcaVmrttk-SbSWlBEDOVK1QJoqVpkO8tYQ-oTyuqxOPPlzz08_K7lXpERE7esShLHAkYcfZGWRdQSrGbxUXCpQto0TsZ8ZVYsnDz9kTPRtHr7z8B2a7fNnoopZhGZ7NJNWGKkqK7I2VW3mGs22aGaI2oNBhCh6WEYzzkT9MtuLGs1me0pnRkpOD4QJL9y8iYaochlZmimdBXiO575t7KTW4knIZ-FI169aSWmmlfudvm5ONCuo5FLNckb2QmrDqEazQshZo2e3ubTyvHBDVHlMZ8TDd_oIGM0-BdZdO8X3vhpYVXrhGmThhfeoIkqDQsQgEDmSBSoYh3YktiPXMge0BwGKGCZF2xPani-1EEzsUUW0Rh6OH2pB7RD02Tb8SgTZW3pi6x2lzGsOdpQDCMedyUWXBK5WDU3og9BG1a3sLXBoPnWCi35SKzryd_8MiiAY7D22uZkBeTj0kf_i9__CJY6SMEGNn4UrL1zpV91--KyYMI0XPLaulJwHKfK8k9ooIKWHl9admDDN_mY3qj_vCx6-8186THazO4EORqBxmkSXQK85EFFXn8SW7QXhHk5q0ez6OeLSzjIZRIvAgYgdiIvYD3E4gLi2FvsFqDyCel1LYeDFtD0_E5FzuH9hxsPJlDy2GByQoctjQMIlXFZ-s2O2X4bQ1iiTkk_HY4PAgRgNIfoU4yheTjJZK8qZazHSWRrGQ521IWrXBMRdGxCHXvD4zAQgKoU2nRdMyk0Lx8G7HOON8mSyyaLc9bnYnYwmJMonmqyR5UyWfDPZkg408fhawZb9Du03WdmNWCo0cm6Lv9XHdDiX1MGZDnFGy0UWp8sBztPOvFn9dFcznoPqfKhkxsaGVZc2bLL9V8Jrd1ttWnqDWlmDOvdtPnyUlPCvRDGbX13ov3-pFGjdhIWLD5tLXVcRX0L7Nyby0eMbB3TjXk2Hh2NOyiwnvo0-w1WulCKvX6CwQdDkbVtFmPLC9Umf3V5zyQDum5iZupbQ6v4HTNOZ0wWW5rSyqaHf_PQHhMB37SOOcPR_-3DtYxLf7Kg9-ablPhhxv_AheM9KDk0A3kBWX-B8YEZXFWEtZTpdWBwfJbWtY0OdMr50BDkM4hGD6WIZv4fBI9PMGsEHUUiHvWHW-gNMwOJzFhC6C8iiJE_fvYC_EHkDzEHupD1RjPM8uLZxfNgCH7beEc3oHZf0yVkB40ybHTPtDrl73mXMnlbX4xE5GMI6gULmsJOVncgdOqDDGmJBuAbnw1GyxvWNqqFziFPfoO2_HF7rYNMputWjo-jFSNFFGCXvVPSK87OutaPs07lzclttETpLWLpLCIMMX_Oy8xJULT6JXwk9MAE9WmcJ3_T1a5hXRJm5b7-NRV8Owk7mikmWhJmPrk5kT-oDiBexvQnqgrzLuJwkFxeQkgUe4Hr4bB_tawZ_GNF_rOoOkaPqdAw5y4N3QP61KXW46u2aJoWb5U4Aw_4IbhYXQ81z2BP62h1xz8A_lNXZSH84aIvJAe0WN5IUB1GK2gdPueFdW3z91JQEPZwMujfnKti92DMB3WF0MORnIDmoLRBFD5_a7dM5tw6GrmUOP4H4zqjHphr5nUEfidhfGjLYKYxiYm-zK6e5Z301EtiRsDrt88MAYFSt2RG-QLEW5rNRTnw4Fp2LPzAO21dtoOx2_NPZoBbstxp21ehJRZ531bNiBnZ9wWvwUA4FqbkNUhwMfOfB7kxxaUlrKXRdWitaTVY_aA3JsTS3RgVLWmTBW2gG9alHRYTmzRnh74KNTHC1fexLWtO5SofPWYCT3y1oEceB4yqfidKw2j668LZQEqdCM20m3eFwgEZjpqNgccHNOlPuymxAawO9dSdT8hgFCweem4QEvk8WjiE8KKvOk6sN8U2IrJvYQebmFn6c-37mEtfOZTM-Iihc5u76UibMjFpwDvrY5RUwDUNnK29xnhdxPJ27k7cWOd220IFyUCejkmuEyRJRGuxKwsS10zA9EDU-Arttp7R7MvAtNAd76mIPaJbnqKd5HTw2fj5YwbYknH9tLifbsH9hIaMoZWV025uTXueKHa_UgUa3LJCFaZE2bAzk9tc2O9UQ2vR2hSwbKuwQSjjPCH3aFcIiPVtIO3dnLetgLcuSiHzsqG9Xw9qDFOFO2DqH5FO4Oj2w29GXlyBov2T2JGJDG7OYGhadwbZhZxRpT3VN90gc4dxav1SDfjtkdd6gV6cS3Kiq2BYVO6pw0l_u_CKzy_oIxrcz-J23M19qsSUF8FeHzrdVN-EFDsaOq45umSALqRsA_-fsYnQWu2oA7s0XxFlaxFeJaxRGvgl9PZvOXj160A64lhC_MXQ1ukGa8BajXatjRaPsJKYhyf8oGb_ITF9n4heZfWTaXMv7v9mExyX6ruD5XvI6C_lxFFqGHArdq0NIloFPr8HdDD47GcCF0H-N-r-QwqnSzoYTh7TlKNEIFrhLO_tUowfd7Bqrb4rj10LxNMmFhePgddI5PwsSfxkhi3SSCVt55wn717Bu8tswT8OU3MBtEPtJHPmpH9wcbhMCSRQu0jzyaVYs88SnGcThIqDFghZL_4bdYh9HPrY_wcIP5gmm8ZJE-TIKipimCy_yoSSMzy2lc6n2N827VLcJThbpDScZcN28H4exgGfUdHoYe4vNjbpt3sLK6r32Ip8zbfRZimGGw62H8eNrBahq32HxMEZaltC_tIS2X-_RkRFUyeaNNN2-oaYvvaKm2vfObmrFb__8-2HNsv4dAAD__z2TL0k">