<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/62207>62207</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Crash with unsigned _BitInt(1) global variable
        </td>
    </tr>

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

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

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

<pre>
    This code causes an assertion failure in clang CodeGen for all targets (I've tested x86_64, Arm and AArch64:

```c
unsigned _BitInt(1) a = 0;
```

```
$ /work/llvm/build/bin/clang -c test.c
clang: /work/llvm/llvm-project/llvm/lib/IR/Constants.cpp:2118: static llvm::Constant* llvm::ConstantExpr::getZExt(llvm::Constant*, llvm::Type*, bool): Assertion `C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&& "SrcTy must be smaller than DestTy for ZExt!"' failed.
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: /work/llvm/build/bin/clang -c test.c
1.      <eof> parser at end of file
2.      test.c:1:21: LLVM IR generation of declaration 'a'
3.      test.c:1:21: Generating code for declaration 'a'
 #0 0x0000558258e8805f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/work/llvm/build/bin/clang+0x7f8505f)
 #1 0x0000558258e85d9c llvm::sys::CleanupOnSignal(unsigned long) (/work/llvm/build/bin/clang+0x7f82d9c)
 #2 0x0000558258dc9ca8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f1066290420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007f1065d2d00b raise /build/glibc-SzIz7B/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
 #5 0x00007f1065d0c859 abort /build/glibc-SzIz7B/glibc-2.31/stdlib/abort.c:81:7
 #6 0x00007f1065d0c729 get_sysdep_segment_value /build/glibc-SzIz7B/glibc-2.31/intl/loadmsgcat.c:509:8
 #7 0x00007f1065d0c729 _nl_load_domain /build/glibc-SzIz7B/glibc-2.31/intl/loadmsgcat.c:970:34
 #8 0x00007f1065d1dfd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #9 0x00005582586a1245 llvm::ConstantExpr::getZExt(llvm::Constant*, llvm::Type*, bool) (/work/llvm/build/bin/clang+0x779e245)
#10 0x00005582592b8897 clang::CodeGen::ConstantEmitter::emitForMemory(clang::CodeGen::CodeGenModule&, llvm::Constant*, clang::QualType) (/work/llvm/build/bin/clang+0x83b5897)
#11 0x00005582592c19dc clang::CodeGen::ConstantEmitter::tryEmitPrivateForVarInit(clang::VarDecl const&) (/work/llvm/build/bin/clang+0x83be9dc)
#12 0x00005582592c1dc9 clang::CodeGen::ConstantEmitter::tryEmitForInitializer(clang::VarDecl const&) (/work/llvm/build/bin/clang+0x83bedc9)
#13 0x00005582591c48bd clang::CodeGen::CodeGenModule::EmitGlobalVarDefinition(clang::VarDecl const*, bool) (/work/llvm/build/bin/clang+0x82c18bd)
#14 0x00005582591e8cd1 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/work/llvm/build/bin/clang+0x82e5cd1)
#15 0x00005582591e9938 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/work/llvm/build/bin/clang+0x82e6938)
#16 0x00005582591f27c4 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#17 0x0000558259c7cc69 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#18 0x0000558259c6f890 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) CodeGenAction.cpp:0:0
#19 0x000055825b5e4d64 clang::ParseAST(clang::Sema&, bool, bool) (/work/llvm/build/bin/clang+0xa6e1d64)
#20 0x0000558259c7a868 clang::CodeGenAction::ExecuteAction() (/work/llvm/build/bin/clang+0x8d77868)
#21 0x0000558259b4fd09 clang::FrontendAction::Execute() (/work/llvm/build/bin/clang+0x8c4cd09)
#22 0x0000558259ad1c76 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/work/llvm/build/bin/clang+0x8bcec76)
#23 0x0000558259c419f7 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/work/llvm/build/bin/clang+0x8d3e9f7)
#24 0x00005582563367c6 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/work/llvm/build/bin/clang+0x54337c6)
#25 0x0000558256331e5a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#26 0x00005582599392bd 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
#27 0x0000558258dca190 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/work/llvm/build/bin/clang+0x7ec7190)
#28 0x0000558259939b7f 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
#29 0x00005582598fde1c clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/work/llvm/build/bin/clang+0x89fae1c)
#30 0x00005582598fe8bd clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/work/llvm/build/bin/clang+0x89fb8bd)
#31 0x000055825990679d clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/work/llvm/build/bin/clang+0x8a0379d)
#32 0x00005582563344e0 clang_main(int, char**, llvm::ToolContext const&) (/work/llvm/build/bin/clang+0x54314e0)
#33 0x0000558256344715 main (/work/llvm/build/bin/clang+0x5441715)
#34 0x00007f1065d0e083 __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:342:3
#35 0x000055825632cb6e _start (/work/llvm/build/bin/clang+0x5429b6e)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
clang version 17.0.0 (git@github.com:llvm/llvm-project.git 626b7e5dd249f569203e024141c1a2a0f618df9c)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /work/llvm/build/bin
clang: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/test-adcc14.c
clang: note: diagnostic msg: /tmp/test-adcc14.sh
clang: note: diagnostic msg: 

********************
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWk9z4yoS_zTKhYpLQv8POThOPC-v8nayiXe2ai8uBC2HHQlcgDL2fPotkOwIx86LM2_3slMZx0JA_7r50d3QIVrzlQC4CtLrIL25IJ15lupKakOEIIpdVJJtrxbPXCMqGSBKOg0aEYGI1qAMlwLVhDedAsQFog0RKzSTDL6AQLVUiDQNMkStwGgU4OIuwPkLIAPaAEObIltmSYBnaKpaRARD06miz1kSxNMgvAnC3WcW9j-0f-6EQ83Q8pqbO2ECXEQBLhFBQXyDwiC-Phh3dLLhEScowPMfUn0P8LxpXtoAz6uON8z-5iLA816rS-pgTwYMrjGIp28H21-XayX_DdSMWnkV4PndY4DnMymsfY2e0PU6iKc4igo7kzbEcIrcgHgaxNNdxwBPj7Tebtaqb1mB-dftxprh6Fhr4NcXi-0ahsZKyibApZU93S9nkIWzyyC-XYHpuxYBLoeGJ0oaop74T7gT19zo_iUK4hlabN_tE-AswBkKMH5SdLFFbacNqgDpljQNKGSeiUA3oM1i63jT6xMFGAc4dxQDNukt_3B_O326RbqrWm4QQVW3QgrWUhlkJHo2Zq2tpnge4PmKm-eumlDZnlwfrnUHOsBzR0AuaNMxQOYZEFVEP6OK0O9GEQrWYmsFayUpaA0MadmpvtmOJFpLyonlteoE0lTxtRkgPxlCvyPWtes9s8MJelBypUiLiFp1LQijj9LpA1yMJsj9C-IZyDqIb9GaKA0KEYNAMCRrVPMG-s546DxMEE8jR0Er-_7-2x_o7hGtQIAijg2yRgxoQ4bHAOckwHk_U3x6pi_DDGLV-w27pCfnQQGOQxRuwjAM07TAaQFFEab1iLR6q_svD4oL48y56NdkRHlFfiylNgpI6-g2Q9zyv0SOgn9u1gBfh5u8LtIwrS1l9-CiA3ApK-kxcLMGiOjWX8UTXwnSBLjYe6pG2vnPhoJZST0o2IPCaElJgWaWqI9A5QuobS_7NyJYAyrAxWADr89MCgMbM_if0P3fi4gHEXkdhVmGyzDBIVouFWgjFSyVGZToPVrvwy8bLrrN5Up0_Yu1eVZA2ETLSeh0iZIEh54myVhMyjALwwopwjWgkU1WDa_o5dPPu5_59f4RT-IowHM9WHk-mdinrWawthu5E3zTN7w4NKKzj25qR9M0clzdI0l9JCEt0hKRSjpNP4bEsN4abpQTUlghI4Jnh0JyXKIVmGWPe6lhZX3A8oU03YctwIWx-jeSsFavKOlFp6F16cWr7PyY7KVolnbgksmWcPFrIsvckihOXmUWvsyI1Sz7AHGopUzmKBPHNcs8ypQe-TMS4ST9bwbG83ZrXgJO0j1g6zc8r1biqijKHO0yB4fFZUoH8FtuDAwaQMvNXKo_oJVqG-Di9GD38IdkXQOD9zup82iSv3ek6RU_T9sirtKizD1tI19bGpWMnqetUVv7_KD4CzEwl-obUXeCG1_xb0TdAG0QtVM4Xc_GDiWjHnZ8iJ3R8lPY59Ih5qThP53__YuBM1p6wGMPeESTomLvAB-zxDVZzF8aWZHGoau5BS_Fu8A_vUcKTKOiYp4Cia8AFJRFn1PgFPrdW9r4u2KndtP1-_5cXSClLPJ0SQ90Kcu4-JwupzU4G2VWxoWHMvNR1jinybkoF3J9Dy8wYBpj7Vt25pysiTI2ByiRN9Pb1MMiyz1kNKc0c7MQIcW2lZ1GgrSg1y7zKz2ANt2U6q5dN31znwC9D_OLkt36EWyyh3pY19aMoI6jK3x0WV2U4dhu14R-B8Gsd-janVs4F8egzpRaHh_H4YXBKoWEZd76Pdjkf_q08AU9QUuGwNBv3c9tYZJBxOyh_ZVQODxYNlJkx2jf6zRwaAO0MzA0DcfIc3jN8rzIPF5jP_5USc1Cz4fPlU17BTuC4zMIaEJZ6Dlj7EcRwiKaZ74h2jVvQN25-EHhuC1OQ_5EyKgo0DzzUPohgyZRWXtZyYDnFeyLpOQttjfKfMKHshjK2ssisBcPsjjOcpohSqOlzVK9TG6qFNnabRPP6DNRr9EpvnVZjteGZ-hFcvYJkGkSxzn1TZgegIwgJWhnt1m0cBtrBPWpJU3zDejeRR1BfJCz2TmGc5qXMDDFX054KOx79jIuccWc2qN56044Mi2Vs5x7O9zRxLd9F0qapiL0-7IWFunrkveyh-WfRTPZtkSww510dIW0GfrJtZVOrA1G9jGKi5XreTss337Ackk3myjqHyqiOV1q132wotfZNiyNItzo3euD6UjTWDpLNXpvu4ySGkeR3uZuSIDzhrQVc1cWe1PhYneo_11Wx9cjPzitk6gMx2n5kTN5_-axE0-khmbrmfP9pTv3vAI0j8rQo3VxyJ8qr9H_8_ofpDAnF9oLyWVRM4joScM5v0nexKCdNT0nezDQdhh5g9k7MsZdp17gH-n2cU9d1gQi78zk39mVRQ0HR4-PKP27rPRpjX-X1T3XxtP4Pae6X-Q14XZ93d3Xx400MOHXTVUdHHL8G8SyDLO8PGmqm9F3LxQficGnTPw_NNWZEZ-EcV76xsEHwTRJYMirdzF_B87t9unbm5sTofLMKB8l4LnDOPaBJUkepWi4LDtn5iTKI-9i6PDyM4SwiNFy2fDKOjeizPKcOzmqu90taP_VvXTzuNu5OMH281X8QfqCaZUB6gWfqRouqwz2qu2LYqCUdbDToSJYD2ksogOP-oIO-sHNM4INN32VIIoTK77TgC5fkJFIAyA-Sj_HYtALKM2lQFE-CSehHbjiJkjCUc0nnh6p-UxW3KAMZ1UOKWM4Kes0K3EYQ4iTKIloRDAJ6ywqWD26fF-4IqZVabi47MR3IX-I0QVm389dfKNWMrAnUbSWmm_6Vy5RbhpgN1z9aanHt6eQxh4WEONkJaQ2nKJW9-XHYVF_4WdUHB1qa9PFYjr7DS1-u0Xzr_f3X_9597cvaH53f_uEFl9d8_U_vqDH24evj4t9RevhWG2s0K4we6o-tu-gALmwDAwRs5_yI_rjuWnX9hO0uSSM0ih5U6M9c7h-Ptf8f9Ui7GrTF-wqZmVckgu4irIiKnAUJ-XF81VW1mlRRYykLMwqSuOC1UlCUgZ5XVY4ueBXOMRxmERFhOM0KSc5LvIihrKsy6iuEhwkIbSENxNLuolUqwtXAb3KMA7zi4ZU0Gj35wAY7_S3m3MFwhVjZ7bd5q32Kb25UFdub1XdSgdJ2HBt9OvMhpsGrlya2-_1U5X7lbvgQi9EcVI1cNGp5urzlVynyn8CAAD__-_cxOg">