<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/155736>155736</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [AArch64][SVE] fatal error: error in backend: Cannot select: 0x4c53a330: i64 = vscale Constant:i64<16>
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            backend:AArch64,
            SVE,
            crash
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          k-arrows
      </td>
    </tr>
</table>

<pre>
    Reproducer:
https://godbolt.org/z/57KE1Krz5
```c
#include <arm_sve.h>

long test_builtin_vectorelements_sve8() {
  return __builtin_vectorelements(svuint8_t);
}
```

Backtrace:
```console
fatal error: error in backend: Cannot select: 0x451d27e0: i64 = vscale Constant:i64<16>, example.cpp:4:10
In function: test_builtin_vectorelements_sve8
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++ -g -o /app/output.s -fno-verbose-asm -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 -x c -march=armv8.2-a+nosve <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 '@test_builtin_vectorelements_sve8'
 #0 0x0000000003d0b648 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0b648)
 #1 0x0000000003d0901c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0901c)
 #2 0x0000000003c58793 llvm::CrashRecoveryContext::HandleExit(int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c58793)
 #3 0x0000000003d0086e llvm::sys::Process::Exit(int, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0086e)
 #4 0x0000000000db97bb LLVMErrorHandler(void*, char const*, bool) cc1_main.cpp:0:0
 #5 0x0000000003c62733 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c62733)
 #6 0x000000000527d3ea llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527d3ea)
 #7 0x0000000005281e19 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5281e19)
 #8 0x0000000000f67737 (anonymous namespace)::AArch64DAGToDAGISel::Select(llvm::SDNode*) AArch64ISelDAGToDAG.cpp:0:0
 #9 0x000000000527afd4 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527afd4)
#10 0x0000000005288db2 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5288db2)
#11 0x000000000528b735 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x528b735)
#12 0x000000000528d5c6 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x528d5c6)
#13 0x000000000527ab61 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527ab61)
#14 0x00000000030d048d llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x30d048d)
#15 0x000000000364aba2 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364aba2)
#16 0x000000000364ad21 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364ad21)
#17 0x000000000364c667 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364c667)
#18 0x0000000003fae77d clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, 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+++0x3fae77d)
#19 0x00000000045ed43c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45ed43c)
#20 0x000000000627a27c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x627a27c)
#21 0x00000000045edc2d clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45edc2d)
#22 0x00000000048fb75a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x48fb75a)
#23 0x000000000487543b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x487543b)
#24 0x00000000049eea83 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x49eea83)
#25 0x0000000000dbb815 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdbb815)
#26 0x0000000000db37bd ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#27 0x00000000046607c9 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
#28 0x0000000003c58693 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c58693)
#29 0x00000000046609e9 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
#30 0x00000000046235bd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x46235bd)
#31 0x0000000004624571 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+++0x4624571)
#32 0x000000000462e02c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x462e02c)
#33 0x0000000000db8021 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdb8021)
#34 0x0000000000c6c514 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc6c514)
#35 0x00007b83fe629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#36 0x00007b83fe629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#37 0x0000000000db3255 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdb3255)
clang++: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Compiler returned: 70
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkmluP27j1wD8N54WwIZG6-WEeNPY4_-wm_wzi6QJ9Mijq2MOORKok5Xj20xeUZOsSz6Vbb1ugQYLYpHj447mStJgxYi8BblF4h8LVDavtk9K3zzOmtfphbjKVv9x-h0qrvOagEU2Rlz5ZWxn3kawRWe9VnqnCzpXeI7L-HZF1GP967_-qfw-Rl6LIa_9y94VQIXlR54ARXTJdbs0B5k-I3rtOLy2U3GMLxm6zWhRWyO0BuFUaCihBWuMeTxBJEFlgFN8hL8VYg621xNtXhiCSmEMtpE22FpEFom4UildDtHbyO8afrWYc2kX24EoaVQDy0h2zrMCgtXKKaD9gIXHG-DPI3LUtmZTKYgMFcOsavGMQ-jmJwXPfRBRgRFf4YDgrAC-VNJZJ96CIAkSXfuR0QZYYjqysCpjzqkI0DRBNfYf5WeJdLbkVSjpx76rKSx--3Kebe2zqrBQWM5zVe6yhUtpiq_DEksI-1dmcqxKRdVEcTv_NKq3-5tZD1sKYGgwia8xkjk_GtE-AuWbmqVFFq0SyxJV2jsPBGMixUbVum91IZoziglnIsa4lNlyLys6Rl24s4884r8uqNYM3R97iQau9ZiVmel-3VqUpRmStKsfEVVmJAvQMjlWhNGjXVjC5n1ldy2dE1pmQpzZE7hC5w7M9niknglWVE1TbqrZzg2c7qWYH0JkyMGOmxLMNnlmm92AxY5o_RcGsELI-zvayxrPZnvOZVargT0xIRFdvQjFdRoHTM-czn8zJ3HONndRaPkv1Q46kmxejlbLXlftOXzcnnu24KpSe5YLtpTJW8E47jaHHzUfM8ax0QhFdMV0ekjmZMUTupDKHJtY76zeB7juTIroEtUP0HldMG9CYWQwyx2qHd6KJNuIeW6oc8B4kaNY4vZdS1_y9llLIPa6YMRiReN0FBX5wDV-ZZHunmRgriUuV1wW4p0YcJHbuFlySlqaNevBnaayuW8GbJqIdQiv1FIaN3MB7P2nFLlshQj3sHb3TH5p7WRQkuAk2miKamhfTfnjQQtomGh7beEr6hzT7sVXGamAlIpGLKSFtkxRdbvzjYYHInXfsmFyybIn9CfHC8_kl4mUBTNbVN7kRe8kKRJJaNtUlxy6xX5HPEfR8ZMTHwyRe0AHf0vnrd-DqAPplqaSFo217_o_JvID7o7CIJNfUYMvQE9KJBr0kgss2b7Jl-2XItcSZUsUVNegIer5gyOfl2SLOMvzly29f712Ja9WkEUkOSuSIpI6HPzGNXWm0XcMJkHN_WzIhu9LlNf_aacKxoSIS06Gh2rK0barstq2yQ6d__CEknKaMrq6TFqfXSTSEDUmcU2AD2HM-WKWfPm-g6HytKf9_Bdt2j_g3q_9XOTTaug5yB9Ujx2PkxAd_8S5y2-ry7FKVpctvl5mX-BzNP9n-3HPFIOr4-9UlIyfdRXFMYzcTk0q-lKo2WLISTNUky0XL32XyVfrpUV1Y9ev26Qa6AafBFxx6MfERtsuDdxW-UoO6MigryRX9woG0mnP525v4RZJn5H1XVjl8ApnK_L4UdpV-uiphw9AT-hPCLKbhBz03LYo7ZgS_KxR_NiOLnncFfdK4Gr8j7PnJhD8PefQuv67lN_mV8Sch4YQ64v-p75oLcIj9AujUk7PIf2MBX2DP-Mt_wTIa0H4Zo0JGvdwLkhy_SuI2i4M1XIT_E6g7rp56XBejgGVsGJ_rBwd62tT-B3hbop43mvLmxP8A79dmIz52ja7pqqw5GXhEPGHlURQPWIuBIw-oP5dVH6R_OrFj6olHdY7uGMRxjttRDQGUwt61Nw7fmmMrIsmge9lxfG6uFjh0e6XRE01m_1Y5PzFd_yDWrRZy_x124-bTwtOJtA4l7bxuOOSztLo24gDfYbeU9sFqRJd992HXRd9aFLB5MRbK7vbD2LztqaX4ew3bajLSnX-qH1pY2J5OQYNBOexYXdhtDgVYeGcgve_m_HlJSyVNXTpDXm3L1pmzN_ZoBxGEkAeUv4UyOLc8aiZN0RyL_yLFxAvSzePpqHM9V-34zvRktLGISMxIPKJ_cEf7dPM4ZttAyUY7-Ovu5DuOntKf6piT_EI8pKdrtebsBby2kF57a9bN3rONNg5BssvikA3Z1tpZ8RxeQ7hrYrUT91h0jBWHAc3wW0nmotZeX8cVfbKF69FHW4BgAcASOkTvIPsVHBRnPwP_nEavlgQ6qB45nBy_s8QPz-foUfVJtWYvLjXT5fgQ1uWw6cHsfGC_DnmL1oNHE3AaZzk-KXjpPzZRPTxilawofmtux9oKe2EVk2rkZHSZbLSNz7U4gJ6cyRzTqOAHUeTFfNHoYSD0dHm31Y0qm942nJp64B7hrCgyxp-3O-kwe8doJ-6cZOm7QzOT-TQyL5rsXKFUU3pZMapNfd0916TzgO2WH4--337J3HHH1S_hmBoVjh52DVurmbDm1D0Rx4rCOb3Sg373yOAip_GZVuHNEETigpVZzhCJe1WR5HSz94vKLhgjmV7NRR-8mvteyw3bQfEy0uXbdrvi7V20GITnYupRC1jg_2WPcGqeV0zbufeq6cf33EFEaJjlr2qtMRX7qcSdVDnKzJOB7oHRreDHHk0nd4jnhf3r6b1d69l_xvfnQUSCMPb_WU38ojLzuhp-UdkXYexIDW9l3bPZKyacxbs75o9qrvONP09_TkO9_shEf-AR_hrravB5VOkvlPjX9P5v1N-VNhStTnqN0UldTjzSedxpS3EibjJF2sX5-1X3OpsIh9PDjn984BEP_QA7zKvM1srrZzvtteIsoTuIyCJfeN1EhcgQWR-TaDv8kbft4HOj5lEjsRnSC4ymAiHw8HbrxmyNZdpuB2v58BQQDKaIp9ssEoa4FX4liziJ7XzDvtM7Du5D04533TYe886nd0wUkOMfwj5hOArnLTnguFFpbQDPDtgqbACwGGy03USnDXb3Agc0r0_E3vDNi5v8luYLumA3cOvHYUSDKArozdNt7gVJxCmNIQlpHOeBR5KE-4THzA-SHG7ELfFI6CUk8YgXeHS-YwtIIkKzgMYeywAFHpRMFHPn83Ol9zfNmw23fhjGNLopWAaFaV6KIaR_vaP7VQARgsgSEbL57f78uflZ3H0LVzf6tnltIqv3BgVeIYw1_URW2KJ53-YkLVyh8M6JClf4D75iwkPKKP34KyY3tS5u__jLH52WDrfkHwEAAP__p-0O5Q">