<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/153997>153997</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang][bytecode] Assertion `bigVal.data() && "Null pointer detected!"' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            crash,
            clang:bytecode
      </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/KhcPv5798
```c
#include <stdint.h>

typedef union {
  struct {
    uint64_t lo;
    uint64_t hi;
  } s;
  __uint128_t n;
} u;

int foo(void) {
  const u U = {.s = {0x123ULL, 0xfffULL}};

  if (U.n)
    return 1;

  return 0;
}
```

Backtrace:
```console
clang: /root/llvm-project/llvm/lib/Support/APInt.cpp:92: void llvm::APInt::initFromArray(llvm::ArrayRef<long unsigned int>): Assertion `bigVal.data() && "Null pointer detected!"' 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 -fexperimental-new-constant-interpreter <source>
1.      <eof> parser at end of file
2.      <source>:11:5: LLVM IR generation of declaration 'foo'
3.      <source>:11:5: Generating code for declaration 'foo'
 #0 0x0000000004026d28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4026d28)
 #1 0x0000000004024154 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4024154)
 #2 0x0000000003f68988 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000072264be42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000072264be969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000072264be42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000072264be287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x000072264be2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x000072264be39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000003f3f21d (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f3f21d)
#10 0x0000000007baceb9 clang::interp::IntegralAP<false>::toAPValue(clang::ASTContext const&) const (.isra.0) Pointer.cpp:0:0
#11 0x0000000007bb44b9 clang::interp::Pointer::toRValue(clang::interp::Context const&, clang::QualType) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7bb44b9)
#12 0x00000000079d0e56 bool clang::interp::EvalEmitter::emitRet<(clang::interp::PrimType)13>(clang::interp::SourceInfo const&) (.part.0) EvalEmitter.cpp:0:0
#13 0x00000000079fef70 clang::interp::EvalEmitter::emitRet(clang::interp::PrimType, clang::interp::SourceInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x79fef70)
#14 0x0000000007e30020 clang::interp::Compiler<clang::interp::EvalEmitter>::visitExpr(clang::Expr const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7e30020)
#15 0x00000000079c5891 clang::interp::EvalEmitter::interpretExpr(clang::Expr const*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x79c5891)
#16 0x00000000079b8ecf clang::interp::Context::evaluateAsRValue(clang::interp::State&, clang::Expr const*, clang::APValue&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x79b8ecf)
#17 0x00000000079328e3 EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#18 0x000000000793856e EvaluateAsInt(clang::Expr const*, clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::SideEffectsKind, (anonymous namespace)::EvalInfo&) ExprConstant.cpp:0:0
#19 0x00000000079388ae clang::Expr::EvaluateAsInt(clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::SideEffectsKind, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x79388ae)
#20 0x00000000043edeb3 (anonymous namespace)::ScalarExprEmitter::VisitMemberExpr(clang::MemberExpr*) CGExprScalar.cpp:0:0
#21 0x00000000043e6d87 clang::StmtVisitorBase<std::add_pointer, (anonymous namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) CGExprScalar.cpp:0:0
#22 0x00000000043e85fb (anonymous namespace)::ScalarExprEmitter::Visit(clang::Expr*) CGExprScalar.cpp:0:0
#23 0x00000000043ee1fb (anonymous namespace)::ScalarExprEmitter::VisitCastExpr(clang::CastExpr*) CGExprScalar.cpp:0:0
#24 0x00000000043e67d1 clang::StmtVisitorBase<std::add_pointer, (anonymous namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) CGExprScalar.cpp:0:0
#25 0x00000000043eab7c clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43eab7c)
#26 0x0000000004350d4d clang::CodeGen::CodeGenFunction::EvaluateExprAsBool(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4350d4d)
#27 0x000000000456eb8a clang::CodeGen::CodeGenFunction::EmitBranchOnBoolExpr(clang::Expr const*, llvm::BasicBlock*, llvm::BasicBlock*, unsigned long, clang::Stmt::Likelihood, clang::Expr const*, clang::VarDecl const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x456eb8a)
#28 0x0000000004501af3 clang::CodeGen::CodeGenFunction::EmitIfStmt(clang::IfStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4501af3)
#29 0x00000000044fa60e clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x44fa60e)
#30 0x00000000045024fc clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45024fc)
#31 0x00000000045699ce clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45699ce)
#32 0x000000000457b674 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x457b674)
#33 0x00000000045e6aad clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45e6aad)
#34 0x00000000045e1a84 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45e1a84)
#35 0x00000000045e29c0 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45e29c0)
#36 0x00000000045eccf3 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#37 0x00000000049cd1b0 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#38 0x00000000049bcb84 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49bcb84)
#39 0x00000000066d75e4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66d75e4)
#40 0x00000000049c8d28 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49c8d28)
#41 0x0000000004cbcd15 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4cbcd15)
#42 0x0000000004c38f6e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c38f6e)
#43 0x0000000004dae5f1 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4dae5f1)
#44 0x0000000000db0c0f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xdb0c0f)
#45 0x0000000000da786a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#46 0x0000000004a30739 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
#47 0x0000000003f68e24 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f68e24)
#48 0x0000000004a30d4f 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
#49 0x00000000049f2fbd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49f2fbd)
#50 0x00000000049f404e 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+0x49f404e)
#51 0x00000000049fbae5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49fbae5)
#52 0x0000000000dad0c5 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xdad0c5)
#53 0x0000000000c61054 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc61054)
#54 0x000072264be29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#55 0x000072264be29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#56 0x0000000000da7315 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xda7315)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkW9ty2ziTfhr4BiUVCZ4vfEHLdjbze3a8ViZ7qQIBUMKaAlgA6Mj79FsgKPEgyYdEmdqtncpUSBwa39fd6G5CCNaarwVj1yC6AdHtFW7MRqrr5xlWSv7QV4Wkr9dPrFaSNoQpEOTAyzfG1No-onuA7teSFrIyc6nWAN3_N0D3_9qQx5coyVLg5SD23B9iX1DABakayiAIFtpQLsx8A4I72-fl5rVmlJWwEVwKCJIb4OUQaqMaYg6vEDZcmDhcGVhJEBw1bvi-ESS3UO9fVis7wkfpykDhGm1_0z16ORcGllIClL5ITgHKDisSKbSBDfwbguDWts71_snb-Sj4--EBoAX0dmVZ2ufk1v7Zy4WQlxCg9O-5ACjr0CpmGiWgPxjVNXkHbEPluUE3mDwbhQlzZuhVK4WWFQNeTios1iDIIUD3SkoD0H1VvWxntZL_xcj-1f7FC4Dul01dS2Wb88evwsxJXYMgz5CVYLUA29FBDoK8HeAeueDmXsltrhR-BSgdDLItT6wEwaKSYg0b0XoXhdzOvbP8gxzmWjNlWhPHXsHX33E1p9hggNJW7SgGKIYAoX9vqgrWkgvDFKTMMGIYBcgHCAGUwBLzitE58PLHh7t8eQd1U2y5gRgWzRoqZqlBI-HEXbnZNMWcyO1AG2Mdca0bpgG6h1hY7M5jzYZBorDewOJgB7SAtbK7gzCtGYVaNso125lYa0k4NoxC1QioieK1sXiXBpNnSJtt7SzpzYGXPSq5VngLsVo3WyaM7uwoa4uJyG3NK6ZmbFdXUjFl26y1Z3ivTj0zqhHPAN0XXOy74WxNf2BVzkI4W8OZtBJxXVu5jakbM9dwtrX84Wy2S-MZ1tuZfhUG70BwazVfwVkp5OyFqUJqZvvhbAlnszUhMyNlRTaYCxDcvonUDtYC13ojDZyVRFZSzSjHayG14US7NVrtTprZrmaKW33gaibYj1m7G7Ews9YtasWsc9ho4lTfxhLf6hMECyZLENzBGivNFMQGMkGhLGHJ292CumH91CD3fRDkkVX9w8P3P-HXJ7hmginc-qssIWWkwt0rQEkbMRLg5cGbsr50MsQaEkkZLKU6KwkCFHjQ23n7_0IPxRSlg82oX7V7eFRcmNabvjl_HGxGhX-spDaK4W27pRbtLmw3WPrLbgXQjbfrgHVhDaDAn8AO_Sg8BXtRMSya-i-x5GuBK4DSQ6SwcePSIC2MHiQaggzKOM3SFC6s6z0xIl-YenWo_g0LWtm10k5vozELKQzb7UOm1_7v5Aed_AShOCxYiCLkdXRc1N2l8SoOZxUXzW62Fo3rIHMt57GDbKf0gMOxwCzOSgJrs1EM09Uzr6rPSW_n99KjKdwwieFatyr4LOwwiXvB8VgwSpMygLiwQflTYtuJvdjkSKxffFqgX_QC07HAIGNZ_DmB7ZReYDZ2sKBEPr2cP3cC3XJ2z41iRVJgwooM7guBNl3bOOmevwrD1gpX-SMIFiWudBepQJAbmT9-x1Vjg8hgdr781rm6q4PaUJJ1NRFA6ZxrhefWW-Gjy9STLWEh-mOIRRieh9hJ2YN6OoFpOPwY3GIo-T8aXH17rdkI82UM0fHoDTEKLElGPRbFsJCyOkf17gVXd1tuDnTZlpsnZkCwOE_4UfFtx8gP2qLq3Mhlm4q-ilKOTGeNVmNlnNEGGE4YLhhTKlmZeJ9m8wEqi3NCz3O4kBEdp96I4YgxCzwPnWW86FYGweIjOuk22gvX3NztajVWjG3Zc8ytRqznXJarY9NzjcbWJVGa-R-27qH8-jCV30HJge4pxWNKRcpIed58bejonPUFVw02LNfvRZylwYYdR5oj0sMguo-sl3bell_PPhmzD1DKgnaHT5gBlGIhxetWNhoKvGW6bqvHrLe13XK_QtKOXHSl-onAkk6QplHMBkjtt-bbLjXp64E_Md1UJzLByUR2Rs6SU3ZXlowY_S8uqB33GZW9yz6bsk8xO8_oDZX8dtr7HXvp3Ok4HzwXjT94AkZZEbyn8yXBFVYW_igwfbfx9U-2LZg6Dk3D9rwt6r_YFyfq2FLIn-CKaZoMlbc0W9MuKNUNttXUQhvqujClq-7w4gMOdEwGLQafTt3Wyg9ZpF10zM1i-RgrNGGVRmXxK9o-4ZgfwhFMcDD_13AssD6RjvrWj2AKpxZPqP9_3-LRhBUuEjJktZCUfWFi9HLfCGK3cWfVLTc95H-6dukg9wEjHhOKPBrSTxLqQqsFn-ubFvEbpC5KpoXbkxnl7TCKWZHiz1vnRmFBNn8JS-UDNupd7QZrTm4qSZ7f75oc1CymW8M9PfBnVvGNlPQTBcR3rG4ZqX6Tzp1We52nY517Pi6Dz-v8a-n24FDTru33fK90QHsao1IiDEsce-wnNvYRiSGFiU8MTvmHhYYxA8u2h_0XpO2IHWhPDkgjD4XlT8Qz-wEnG0Et2f_kZiMbsySynhT_w1GjImr_WXNu3Xy9bqP4spIXPnh1hHt1-JMAkmXkJ7xg33Ij6eub3nDZfWnB9lTGtUmUFHESfo5Kd9jObOeYxpdKFriyQWbs0Yf5RzFpvNqX_cDfdyDRMe71Ma6RIhZj_G6i-1PSpmK9YR3vPfhbVnLBHd-PaMe1H-qRy7Jt-fRswwlbH6fvWv802_9dLC2PnmU0YYky4v0cy_PcLovfIuzxxxP8hLyfO6f4v8n6gb2wDu2QhWvJj88qR5KOi9xgXEZlhPqF914V3sm0AUOqr9u6cs3ux5-3MX5RsqltHkQZdJhuGl7RUwepwbjayApSjP36BpNnJuhCCt1s9980nwVxOYM7gL3BR1VGHNMkYiP4j1hpli-_TbIG2-JJqrz4h0EH5gA19CZOkFKUnvDNfJj7dow0hnVN-1sIF9NlC6EHOM7VpCDUj4YA75UUhgl6AuHFsbnVe2zj5EuCtIwndYRb7Wt7tEXYaf2dJ3PpZOkQ9vjHyZJiFpX--POjRdrTeJEEH6M-onnphOCQ9bhHac-jhUe8EhLir7bYTj19xYZs8KTiXsBxG1pAd5npsvAdvh59NEaPkzTGcK_qhf_NfVr3HJZbXFXfGTlE3BNU4nF2tjJO_Q5JFX85FXDDcYrCgZcE2fROU9kVRCvV6rPtdVvscOhCcFUVmDyvSjH-3HELd-6y8Bdyu8WCTnfrSbsdzotkbVfHVgED5RjFxbodedcZ9TBhtSK7XXurBAR5YT_NV7od3qlwNNg2rIzC3Oh990Qcrirr_lIN-u2QwRFOfjj8dVMASiq8LSgGKOlVhdL9tY0_ZHHCGMn0ygVDw3shpy5WuJ6nRixxyarxNbO37XZJT--w9q6eTt2KhqPfl_7fucWkRDtt__EhRVaisqBntdbaCx_lvr0qR4F6MtEOOPczxxtD81GRcvEfOzrCByeKJiVKGXoh-6w6_pCFPq-LP2TxwPX4tOKt-HuwfY25NXt74-nj6usc5Dcr0aqpV6I_UWKBWXQO8O3geVQCnMj955T_DyrxotVnq5hebWiSq6lHOrXta4097DZw5Eenf-cy8eWqixZTj3hU03kk9r0ohBbr5ZZ0QvslJzfuUEazT17ha6f0AqOpQBZ6cLWyc1baYGVWA0IfXoKFgyXiaREW-BF0wi9pGyvWLbr3a8iUsrkid24Ey67kh6TzcHdPG_7gZgPZjht3BdYPQour0QzOXqCRUDMG-aAgt2vsC_HudjyzG8zOHN5-v6LXAc2CDF-xaz-JotDzozC82lx7URqgJMywzwhOChSlKA19nGZ-SjIckCt-jTwUeamfeEGAUDiPCoJIWSSMYcoojUHosS3m1dy6_1yq9VV7Nfzaj4IsS64qXLBKt_90AqH28nJ7M31h3zrlFK-GkfYcEoHo9kpdt1fNi2atQehVXBvdyzbcVO0_xHCTo1sQ3RzmR7eXvjd_1ajq-ufvxnc6eLlG_xMAAP__vrtrtw">