<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/112379>112379</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang++]  Assertion `UserValue <= UserMaxValue && "value is too big"' failed.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          yijan4845
      </td>
    </tr>
</table>

<pre>
    **This testcase is generated by a fuzzer.**

Compiler Explorer: [https://godbolt.org/z/qcsh9qGrf](https://godbolt.org/z/qcsh9qGrf)

This valid code will crash on Clang Assertion Trunk, it seems that this goes back to clang-11:
```cpp
typedef int __attribute__((ext_vector_type(4294967295))) type; 
void test() {
 type x;
}
```

Stack dump:
```
clang++: /root/llvm-project/llvm/include/llvm/ADT/Bitfields.h:126: static T llvm::bitfields_details::Compressor<T, Bits, <anonymous> >::pack(T, T) [with T = unsigned int; unsigned int Bits = 6; bool <anonymous> = true]: Assertion `UserValue <= UserMaxValue && "value is too big"' 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: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.      <eof> parser at end of file
2.      <source>:2:6: LLVM IR generation of declaration 'test'
3.      <source>:2:6: Generating code for declaration 'test'
 #0 0x0000000003bae128 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bae128)
 #1 0x0000000003babdec llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3babdec)
 #2 0x0000000003af9048 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007a6304c42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007a6304c969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007a6304c42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007a6304c287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007a6304c2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007a6304c39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000034cf4a8 llvm::AllocaInst::AllocaInst(llvm::Type*, unsigned int, llvm::Value*, llvm::Align, llvm::Twine const&, llvm::InsertPosition) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x34cf4a8)
#10 0x000000000435ebde clang::CodeGen::CodeGenFunction::CreateTempAlloca(llvm::Type*, llvm::Twine const&, llvm::Value*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x435ebde)
#11 0x000000000435ec2e clang::CodeGen::CodeGenFunction::CreateTempAllocaWithoutCast(llvm::Type*, clang::CharUnits, llvm::Twine const&, llvm::Value*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x435ec2e)
#12 0x0000000004365472 clang::CodeGen::CodeGenFunction::CreateTempAlloca(llvm::Type*, clang::CharUnits, llvm::Twine const&, llvm::Value*, clang::CodeGen::RawAddress*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4365472)
#13 0x00000000043393dc clang::CodeGen::CodeGenFunction::EmitAutoVarAlloca(clang::VarDecl const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43393dc)
#14 0x000000000433cfcb clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (.part.0) CGDecl.cpp:0:0
#15 0x000000000433d226 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x433d226)
#16 0x0000000003f02277 clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f02277)
#17 0x0000000003f18e79 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f18e79)
#18 0x0000000003f10b25 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f10b25)
#19 0x0000000003f18894 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f18894)
#20 0x0000000003f80d34 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f80d34)
#21 0x0000000003f92d1c clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f92d1c)
#22 0x0000000003ffbb0a clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ffbb0a)
#23 0x0000000003ff6825 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ff6825)
#24 0x0000000003ff6ddb clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ff6ddb)
#25 0x0000000004001303 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#26 0x0000000004509516 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#27 0x00000000044fa0f8 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44fa0f8)
#28 0x0000000006646864 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6646864)
#29 0x0000000004507088 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4507088)
#30 0x00000000047c1509 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47c1509)
#31 0x000000000474008e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x474008e)
#32 0x00000000048a70de clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48a70de)
#33 0x0000000000cdc07f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdc07f)
#34 0x0000000000cd3d8a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#35 0x000000000454ad99 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
#36 0x0000000003af94f4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3af94f4)
#37 0x000000000454b38f 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
#38 0x0000000004510c8d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4510c8d)
#39 0x0000000004511d7d 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+++0x4511d7d)
#40 0x00000000045196a5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45196a5)
#41 0x0000000000cd8f4f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd8f4f)
#42 0x0000000000ba8474 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xba8474)
#43 0x00007a6304c29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#44 0x00007a6304c29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#45 0x0000000000cd383e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd383e)
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/eJzkWl9z26i7_jTkhrFHQrL-XOTCseOc7nTndBpvz6UHAbLZSqAFlDr99GdAciwUOxv3xDt75tdJmwq9vDzPwwu8ArDWfCsYuwWzOzBb3uDW7KS6feZ_YhFn8eymkPT5FqA5QPP1jmtomDYEawa5hlsmmMKGUVg8QwzL9udPpqadMQiWIOj_Xci64RVT8H7fVFIxBaI5BLO7nTGNBtEcoBVAq62khazMVKotQKufAK3-InqX__WgSjBbApS93xzlw-Yd7idccQqJpAz-4FUFicJ6B6WAiwqLLZxrzZThUsC1asV3gBaQG6gZqzU0O2ygsU62kmlYYPIdGgmJrTgJQ4uoay0Juh_SNF2JeW4YZSXkwsDNBhujeNEattkAlAGUsb3ZPDFipNpYS4CyGOVxnqQon1kO7ge6V9Ed7Fw-SU5dJzgXOQTpXffC2cE9iPpnkC5HsIaaPBrLgrZ18xp-9-joAXRnf2x3oZWS0gC0qqqnetIo-Scjh0eAVlyQqqXsWDBfrgFa3XFTclZRPd2BaB6ixPrSBhtO4Bo602gOonlxsNtQZjCvdFdsI0cxraUC0WJte-WOG21_g2iBhRTPtWw1iO4hiO67Kg0m3wHKnPHaKTS7-8HNDq4hiJawFS7gqe0Tq-rw2Tl3Vol9VUhZnWhnCY1qmQ3JaD6IG5AEf2imvuGqZbaWNbQFv-N9X4YSgBIIEHpyz3YwSQkLvgUIAZTCEvOK0Wkn_5fP9_PHe6jbouYGYli0W6hYI5WxsTcaCtzs2mJKZH2Uf9RLXOuWaYBWEAvL1XUWNDvWDwQb1EZhwqxsjWKNkoRpzSjUslVdsa2JtZaEuzGvWgE1Ubwx07MxFUxBkH9RcqtwDbHatjUTRvfxJBuLjPSTw4QdJge06oYWPmirJ6YblKuCi8PrLjThZEt_YFVOYjjZwom0fnHTWO-taVoz1XBSWy3gZLLPkgnW9UQ_C4P3IFpyYVgFJ6WQkyemCqmZfQ8nj3Ay2RIyMVJWZIe5ANHyTbzWWAvc6J00cFISWUk1oRxvhdSGE9214ZT2ikG06OWN7jvBQisYiBZMljbaGqw0UxAbyASFsoQlr1hniXrLo4NojkA0dyPs8-dvv8NPXw8ztI1PWULKSIX7R4DSbhZJO3fRW-4eejdi282gpVRvOoMARQEM9sHhT1RgFqJsMOD1cz_EvygujAuddRd_2dFI4R8bqY1iuHajZ-FGrR3TdvL7kAAC6C7Y9_Be1g2LPxzhLygjp_AvKoZF2_y3eORbgSuAspcppZK2lWugtWA8tMhDi8s8iDO4sAH3lRH5xNRzB--_sKCVbTTrlfRsFlIYtjdTu4BF88D9fWki6ptIcRIFMYnRDAU9tYoXAK32WbJJ4knFRbufbEXbvSBTLaeJA-6qeLBj32ee5CWBjdkphunmu12nL2rA1fcamI1Bx2kCt9ppcSn4OE0834nvG2VpGUFc2Cn6Is-uouc5feU5LC72GRaez8z3GeUsTy7z6ap4PnMv6mJSxng4xudVJQn-JLR59Twc5WuX-8zt8PZWZ7QY-HJraG81bIFvhV-0_sEFg0S6VhL_3Sdhh9gXqbkdZ9cYmp0GxwQURaE3EcbRjBWUdcnjIceh7IEJ72HVCuIgdoWKYcPWrG46Bc-p9z4Rjkp-OP2enUc_HNMn6P9I_3-42cnWLPD5OBr632H1h-izxn-FQgT5CiFfoWQWp-g6AfJRsizOwvuKf8wptSn7tfRz8nj6Rb5-UR5Rcpl-9zU389bIb1i9CDhw8A2rJSPVQJYr8HKwPV7xiBcpSXE5rx78uxhNG6zMNHB5wYM1eJ0JWGCzETCKUHI5sNeo_gGRLVRP5MRbwsoAoTT9NS6Ppjav-djSa3LqIXucUp9TmLE0v5zTI6-bir1mNWQ0Xo6Vws9fWQmixaDC3Bh1rBDdX0UFR9JTIRupEBRo9gsq_H_hb-l5_PNxFGR5fDn_hawb2QpqWfcL7yORbrPK83W08laPQsrqrfVivt26ZeWxklf5sOtoD3VB_odpmQU0-gVdDiV3kj6_GR9X4OQge5z8j9UyRzS8cAnsP_GZfenzeahkgatuth4G-0v9tzOCxcPB8JMo5XWnQsfbE8b_Li7Logjw3wnzu6RtxY5d3QlwYLFkJRf998N7ZOrKr5hS9qw82tGIdpL9_dx3mva_ka5l49GNx3Qp_dtM6TTd8ySvQoTSwiPiZ1ZBEEZBdCmRtWw-sydWnc6vjp0yTPaGnk7mfMjLk-JZkM9Ct33wsjkOBa6ZbtwWXu4BtPOKVJ_qpuqKuz2ot2E-KNk2diVFOexg3bW8okydRudlPHFc4qDMhrrdYfKdCbqQQre1O3_6BRwfnY12ML3-93KWJImTLPHWpi9YaTZ_XI9WHFbj0Xrb_f5wzD0kD3M-iow0yLITMTsfLqB7RlrD-qL-IOuD1e2ADJH6W9JxSsJZ4OXFKyWFYYKegHolkB0GD6S_X5LGQZCN9ku6Zj8JbbAg7LSi51ld58uqw-kR8bc1MpwG_r5XD_nI50kS_Br-K77X2Vfo8HkEvEU0IJQEaQkJCTc1tj6y03n_Do-S_QX0y9ACPklOr8OjQ-nRiEc0IppheBB_Ea7dTDEg81jjqvrmjqW7OfsEp9HOkPXRnx14CR5V_OnMlB35S90sxjTPnTADv2Wfc22U09a97Ubiy3EvwVVVYPJ9Uwr_q6tru4-hRbiQdY0FHQ_qk32oTW8nG9s6thoM9DGKi62zvO87-KXCZkP2--5KQDQvsOZko515r6JnbAs2RmFu9OH1yB12m1HGnX4f3luT-XGKd0HUae6qAJRWuC4oBig9SoWyw1nUb7I43R_J-AQpLuNBV5w6J-q3_FrxiEtWPXtyvt11V8imOsRe5KejECuirIT_ySEySvvOxkLmCxcGJKNnhXN9h1-tmAc1vcl8VNEaeNsF7zOde8nOgNvHJhCOthdQo1QnDGl6sS6_yUKfF-U3WXzm2pzZgX89Nb_EQYO5DYH-3Oy9OvbB8o-oacUaqhkHIzXzBM_OIV8O_u8lDicyhnO98A-qeYV01snj6ReOFvasjPvp7ZChHPC7aWX--pTwzLL94TmJReZB93LDoMBZnMbQgv7otjvXXtujewwop_mF9xhcFc9nPPbJ4gBuNrbaRhuszGZA7t2tsNhvZTbO5LKIwc7_x_eZdf7S-ugyIFNKukucrhyW_RcGJP2I6G6yQXftju256W4NhVFsYbaawckTNBJqxiAfpP356LqoYqZVgtkxaSu_cZ3xht5GNI9yfMNuwxTlQTDL8-xmdxvHWYaKHJOAhpjMigBFJIuLmOKIJtmM3vBbFKA4DMJZOENJlE0pCnGWpmmICItInoE4YDXm1dSOm6lU2xt3l-42DFGU5jcVLlil3fVZhA4ThaW7ZcLd61vYcnfzS4qJu4V6LO7ND_q5tOnnT9tfCMyWN-rW3eIr2q0GcVBxbfQRheGmctd2h30zW8JrXEm8aVV1--t3Dnupnm7R_wYAAP__3IR-0Q">