<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63566>63566</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang: Assertion `Prior->FD->hasAttr<NoUniqueAddressAttr>() && "should not have reused this field's tail padding"' failed.
        </td>
    </tr>

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

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

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

<pre>
    The testcase:
```
struct T {
  short a;
  char b[~(__SIZE_TYPE__)0 / __CHAR_BIT__ - 1];
};

void c() { struct T d = {5}; }
```

Compiler Explorer: https://gcc.godbolt.org/z/hG8rsKhdP

Compiler Version:
```
clang version 17.0.0 (https://github.com/llvm/llvm-project.git 12e9c7aaa66b7624b5d7666ce2794d912bf9e4b7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/compiler-explorer/clang-assertions-trunk/bin
Compiler returned: 0
```

Compiler Assertion Message:
```
[$ clang small.c](clang: /root/llvm-project/clang/lib/CodeGen/CGRecordLayoutBuilder.cpp:758: void {anonymous}::CGRecordLowering::clipTailPadding(): Assertion `Prior->FD->hasAttr<NoUniqueAddressAttr>() && "should not have reused this field's tail padding"' failed.)
```

Backtrace:
```
Stack dump:
0.      Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -S --gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics <source>
1.      <eof> parser at end of file
2.      <source>:6:6: LLVM IR generation of declaration 'c'
3.      <source>:6:6: Generating code for declaration 'c'
 #0 0x0000559891486f2f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c52f2f)
 #1 0x0000559891484c9c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c50c9c)
 #2 0x00005598913cf398 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fb1fb05b420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007fb1fab2800b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007fb1fab07859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007fb1fab07729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007fb1fab18fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x0000559891794e44 (anonymous namespace)::CGRecordLowering::clipTailPadding() CGRecordLayoutBuilder.cpp:0:0
 #9 0x000055989179ab13 (anonymous namespace)::CGRecordLowering::lower(bool) CGRecordLayoutBuilder.cpp:0:0
#10 0x000055989179ddf2 clang::CodeGen::CodeGenTypes::ComputeRecordLayout(clang::RecordDecl const*, llvm::StructType*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f69df2)
#11 0x00005598918d6727 clang::CodeGen::CodeGenTypes::ConvertRecordDeclType(clang::RecordDecl const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40a2727)
#12 0x00005598918d8cb5 clang::CodeGen::CodeGenTypes::ConvertType(clang::QualType) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40a4cb5)
#13 0x00005598918da37d clang::CodeGen::CodeGenTypes::ConvertTypeForMem(clang::QualType, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40a637d)
#14 0x0000559891b47ab5 clang::CodeGen::CodeGenFunction::EmitAutoVarAlloca(clang::VarDecl const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4313ab5)
#15 0x0000559891b48023 clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (.part.0) CGDecl.cpp:0:0
#16 0x0000559891b48320 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4314320)
#17 0x00005598917a3397 clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f6f397)
#18 0x00005598917b7a1f clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f83a1f)
#19 0x00005598917b0969 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f7c969)
#20 0x00005598917b72d4 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f832d4)
#21 0x000055989181726a clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fe326a)
#22 0x000055989182ae9f clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3ff6e9f)
#23 0x000055989188fe09 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x405be09)
#24 0x000055989188adb5 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4056db5)
#25 0x000055989188b988 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4057988)
#26 0x00005598918947d3 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#27 0x0000559892703ac6 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#28 0x00005598926f5b70 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4ec1b70)
#29 0x0000559893bfde14 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x63c9e14)
#30 0x00005598927009a8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4ecc9a8)
#31 0x0000559891f4ab79 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4716b79)
#32 0x0000559891ed04c6 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x469c4c6)
#33 0x000055989202f2a6 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x47fb2a6)
#34 0x000055988e9290ed cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x10f50ed)
#35 0x000055988e924dea ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#36 0x0000559891d2f23d 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 0x00005598913cf8a0 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b9b8a0)
#38 0x0000559891d2f85f 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 0x0000559891cf69ec clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x44c29ec)
#40 0x0000559891cf747d 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+0x44c347d)
#41 0x0000559891cff55d clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x44cb55d)
#42 0x000055988e92734a clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x10f334a)
#43 0x000055988e82d5c5 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xff95c5)
#44 0x00007fb1fab09083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#45 0x000055988e91fbce _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x10ebbce)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWltv4zqS_jXMC2GDInV9yIPjxDl9tns328n2YubFoMiSrWlZ1JBUOpmH-e0DSvKFip1LH_fgAAMktkWRxfo-FquKF25MuaoBLlF0haLrC97atdKXP0rQVtUXuZLPlw9rwBaMFdwAYjNErhGZoZgMf92jsboVFj9glFz1JRibtdIWc8R2JWLNNc5RdPVPRNPl8v7TX2-WD3-5u1kuEc0IRnSBl8v5b7Ovy6tPD8slnuAARdc7ASg5-N19PqpSYoFoimjmusY7PSRG7NoVRX0r7L6Oad5_ztWmKSvQ-OapqZQGjdgMr61tjENMF4guVkJMV0rmqrJTpVeILv6B6GJ9m2rzX2t5d1TaN9CmVPUp1kTF6xV-7CvhIJmSqWMhHXVc2nWbT4XaILqoqsft16TR6m8g7HRVWhxQyETCOY_jPIlpmEcyieNYAE2yUGYBzYsMwjxBNOv7fuB6BdbBfErjZRxO2vp7rX7Uk6qs26fJqm6HemsNXOKNklC52o0y5VP_6lNtLK8qkNdlxxeiC9VYRBdiwD-BLZt00WGdcGNA21LVZmJ1W39HdJGX9Yg1DbbVNUgnk7xn0GZbqfgLGMNXJ83UWTkNcc-72fCqmgpnYTTtigYQWik74ngLwBWXOaKLuZJwC7X7dfsVhNLyM39Wrb1qy0qCnoqmQWyWRKmT2ZkpSq54rernjWpNZ5MzxGa7xuoH6LLTALGZqMrmgZfVHZfSFXb27QTtgaKY3OlS6QliN4tr97nmZmatRmz-3-r_6vLvLcyk1GCG0pvtLKExojFGlJq1aiuJa2Xxmj8C1tAakNiuS4OLEiqJaGKw5WWFm60iFNEEF7ysQE53pnR0cK64-G41FyfH4t5y8R3LdtPsapApItmdVivNN5jrVbuB2po_ZlrDazxZyR9cF5MQT1Z4opxE3jRObmub1k4NntzjyWQlxMQqVYk1L2vErl_t2FXOpnRK8KQQqlJ6Iku-qpWxpTB4UtRqIjQ3a68YsblRrXbE3PSwAwcbsTmoArEb3HBtQGNuMdQSqwIXZQV9TTrU3Atgs3j4x58_f_uCP33FK6hB885KVIEliIoPj4gmAtGkl8Vek3U7yKhXWCgJuFD6tCSMKCOYPBFCSBRlaRaEaVzQAnfOqrNo82z6H3e6rG039A-dcdB0X0nzH0tlrAa-6ax0jsva9jab_mEDQPSKPDER0YIWO8t1mgcjzUORiWOazyvgddv8T31frmpeIZq2dRc8Ja6Uk39ePYnIhKcn9fRkomBZiufOvJwLeQT93Cv2G69l5bpLB_a8OnNVW3iyg38i3f-uCzZ0kRR5UOQkykNK8HKpwVilYantgLB3gUPc2MeL7kVju4AxNWpKOixBGFLiIQkPu-E5TQnJsealgXfIF05y3EkOGSG5JznyJZMkjTLMc_UuzQ8kU5pGmSc5HktOduP9bpkJ9WUmvswgLWT8MZmMFTL2ZKaelSRZCGHoZO5CD675BkzTzb3sw0EIvxbtRtaUjVThecB-TpXKPSGa5kpVH1DCTW4yUkLKguJtsHcdDnH88OHhuYHtpFebprVw2N1BsoDYrH9zDaLCQtXGIjpzjmvvP-67jNSJ7F6d00kUcSYLug_DlAW-M0tlnNDkQ3DrR9B2D6rX-03AZ0QVEk4Tmnio6AhVKvLo46heYvnflg8IzwsgFHnkAWAjAJwl8ucALJT-AptTMOZ4O0XOCSdmifTghB6cPEz42-OxaGthh7UQm91sSjtrrfrG9ayqlOA-om9cH1pYfF5ELGB8NEDRCFFKKPs4okHtd2GZNlxbFyKdO3MVjvuveKwYo-Tjir3U6pfSG7KDiO9QJL4X5oxlb7ql4yju7ca-ROJKfw0aVsQFy3x3NIqxecKD4uNo7stNU8FLPIdYRrFkpjV__goFYvODBm59t2_gFnpnxZ8yHhQe_lFgz0kWZz-B_0-PPBFZnB0ip2Q88lSGH0fukgrV1tLh_f_SrlVr74UaB6fDWge2vXXx85P9zlarb7xq4b5SZ149FSmjMvQYGSUcQUJj_nFGtiVXSj6_ahNnRQOMxtxDM0o0KIfsgzN7WDiDe-kjua1UzqveEx-a9q59b_Mne7vdVvxUF-pXObsihsyb7HSUuqQFkDcn-xcl2wr2w9tD3-p_DUVZlz3k9xDUl3cmff5kM8qB-HM8HAHm8u3k5jjgPxfQWPo5D41GQPMsTX8O6Gl454WQZGnqQfCzozQLE_lm2jaG8KCaz_AI1fEcaT8QhwnboaSjeRv1Mh6aEMZF_Obitxfr_IfSnzZN1Rf3Gzqvq3mrVdu4-Egz3Kv12qqYehkMjYsoT7ys8oqL71DLuapNu-kOQ35Cj_ONPIggT7yMkno5CMsLCYEXie-4NjC7fxhFE9jwURQ9-4IpZiKDwIuS_u4oTQjJ-LGpNjsMi08gWgtD0Xbv_nyMiox7c2m0D1qEPE88R7_QqrZQyyNKnl29JIjzxHPLo-1PkCQUMR6lS67D7lCqFnCcxdN4zr0KijMRitiD4IVSSmhBuQdhUHaP5FEJ_lLxF0jPHSuSIqfcV_0wKKaQ0YyAxEIEyw13rdPjmfqaj9LzOfbL6Lw7Gzs3goAUEQFvz4JFIwShBI63jM-Dh84NHOC43_Cq-gZi54qPwIn9-O1kDPvrXn4mdfl4whMzP4JJWlAm-_PCvdxiSJyWuqO1P00czgRvhs1aXlU5F9-XRe0vkfq-B8OZB3O12fBajmfv0eEzdqinGtc7dxx4-5plvepq3gxju2uwXIqnpyDoH3JuSrE0tt_O7Vj0KruCpdW8tGb7eiSOdztEVumD967KbO-_O_vpOe-aIJpUfJNLjmiyp4qm25Oa31V-fDyS8SlLysnBUBw7Sxn2Rdv6nhdQPXt0vj50Z83d8yxPuRckR4cBkhZp5C1n_uOMY5THnbQCf4dDFHEG4iRx3ajxF0Fxy6bnu0cNXQVvbf--qjMvhznAdqYAEAqagTg0pZCMGElCfwf7PYz8rnJzmo7fVf65NP5Wx2vueGcBDS_d4Henne9ncDCTX8wjC_2t8zAY8VhE0Ukerw9-e7nBkaTgFP__Rh7PmYKEIo8inzk6CuAJC4edpm0SstW8cyKzF3uIp8LzOdMOxkJvRylkntYplZGIsNP3fN0WRRYJb2kfjk7YSUZShpfLqsyds-XaLg9UeO_5dUhS5vUySqmCIheAe_nnJBXyvF8k7-_MITbDoLXqrp3193uKIZ3HYrDQ_pYS_lHaNYan0vYXWQLWHYe3BvDkEVuFDQAuDzLt7JXLaAELj15lupCXTGYs4xdwGcRpkgVpkoYX60vgKRSUFZI4biQnEQEOUSppkkkaiovykhLKSExTQoMsDKdxmPMkhaRwa_IkzVFIYMPLaurseKr06qI0poXLmEVxfFHxHCqzvbypL7sra3m7MigkVWms2Tezpa3gcsfen-om2UWrq8uPXXpEdNERYRBddFz8KwAA__9U9RW1">