<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/118934>118934</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] Crash at O2: Assertion `llvm::isUIntN(BitWidth, val) && "Value is not an N-bit unsigned value"' failed.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          cardigan1008
      </td>
    </tr>
</table>

<pre>
    This code crashed at O2:

```c
static char c = -2, l;
char d;
int e, f, b, k;
static char *g = &d;
long h;
static int *i = &f;
char a;
int m(int n) {
  if (n < 0)
    return n;
  return 0;
}
void o(long n) { *i = m(c + 6) + c + n; }
void main() {
  a = c;
  char *j[2] = {&g};
  for (; b;)
 ;
  *g = 0;
  e |= 0 != h;
  l = *g;
  o(l != 0);
  c = 7;
  for (;; c = 0)
    k = *i + *i;
}
```

Compiler Explorer: https://godbolt.org/z/r96WqYacv

Bisected to https://github.com/llvm/llvm-project/commit/3e1b55cafc95d4ef46f302d0fcd695461e376958 which was committed by @nikic 

The crash is: 
```
clang: /root/llvm-project/llvm/include/llvm/ADT/APInt.h:127: llvm::APInt::APInt(unsigned int, uint64_t, bool, bool): Assertion `llvm::isUIntN(BitWidth, val) && "Value is not an N-bit unsigned value"' failed.
```

Backtrace:

```
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 -O2 -Wall -Wextra -fno-strict-aliasing <source>
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module '<source>'.
4.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@main'
 #0 0x0000000003c01b78 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c01b78)
 #1 0x0000000003bff87c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3bff87c)
 #2 0x0000000003b4cd78 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007dabed242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007dabed2969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007dabed242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007dabed2287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007dabed22871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007dabed239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000004ed6c79 llvm::SelectionDAG::getConstant(unsigned long, llvm::SDLoc const&, llvm::EVT, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4ed6c79)
#10 0x00000000026d7805 (anonymous namespace)::X86DAGToDAGISel::matchIndexRecursively(llvm::SDValue, (anonymous namespace)::X86ISelAddressMode&, unsigned int) X86ISelDAGToDAG.cpp:0:0
#11 0x00000000026d7c89 (anonymous namespace)::X86DAGToDAGISel::matchIndexRecursively(llvm::SDValue, (anonymous namespace)::X86ISelAddressMode&, unsigned int) X86ISelDAGToDAG.cpp:0:0
#12 0x00000000026d952a (anonymous namespace)::X86DAGToDAGISel::matchAddressRecursively(llvm::SDValue, (anonymous namespace)::X86ISelAddressMode&, unsigned int) X86ISelDAGToDAG.cpp:0:0
#13 0x00000000026dab90 (anonymous namespace)::X86DAGToDAGISel::selectLEAAddr(llvm::SDValue, llvm::SDValue&, llvm::SDValue&, llvm::SDValue&, llvm::SDValue&, llvm::SDValue&) X86ISelDAGToDAG.cpp:0:0
#14 0x00000000026eb1c7 (anonymous namespace)::X86DAGToDAGISel::CheckComplexPattern(llvm::SDNode*, llvm::SDNode*, llvm::SDValue, unsigned int, llvm::SmallVectorImpl<std::pair<llvm::SDValue, llvm::SDNode*>>&) X86ISelDAGToDAG.cpp:0:0
#15 0x0000000004f0ba37 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f0ba37)
#16 0x00000000026e0cf1 (anonymous namespace)::X86DAGToDAGISel::Select(llvm::SDNode*) X86ISelDAGToDAG.cpp:0:0
#17 0x0000000004f0106b llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f0106b)
#18 0x0000000004f1026a llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f1026a)
#19 0x0000000004f137e9 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f137e9)
#20 0x0000000004f14aa0 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f14aa0)
#21 0x0000000004f0544f llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f0544f)
#22 0x0000000002f54029 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#23 0x000000000355b57f llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x355b57f)
#24 0x000000000355b931 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x355b931)
#25 0x000000000355c1d1 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x355c1d1)
#26 0x0000000003eb4a33 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, 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-assertions-trunk/bin/clang+0x3eb4a33)
#27 0x000000000458355e clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x458355e)
#28 0x000000000653a51c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x653a51c)
#29 0x0000000004583938 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4583938)
#30 0x000000000483e9b9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x483e9b9)
#31 0x00000000047be64e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x47be64e)
#32 0x0000000004929a1e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4929a1e)
#33 0x0000000000cb12df cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcb12df)
#34 0x0000000000ca8e7a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#35 0x00000000045c6b89 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 0x0000000003b4d224 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b4d224)
#37 0x00000000045c717f 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 0x000000000458d41d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x458d41d)
#39 0x000000000458e50d 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+0x458e50d)
#40 0x00000000045958c5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45958c5)
#41 0x0000000000cae123 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcae123)
#42 0x0000000000b82494 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xb82494)
#43 0x00007dabed229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#44 0x00007dabed229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#45 0x0000000000ca892e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xca892e)
```

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWl9z2zYS_zTwC4YeEvz_4AdaslJ3ksYTu0nvSQOCIIWaAlQQdOT79DcASPGP5DjOKZ3OXSe1aWCx-O0Pi90FSNw0rOKUXoHwGoTLC9yqjZBXBMuCVZh7rptc5KJ4vnrYsAYSUVBIJG42tIBYwY8I-Blwzb_Itf8IcLNGYcUIJBssIYHAX0IHAbSANfCvgZuZ9sI-M64g1X2l_pHrH4-2Z6wEoKwyegCKuoG14BXcTES1LoAy1kuWo-nwMN0WoET_5gClEMS6GUJWQoASDoG_gC5AqWmEUFLVSg65HX3427V_g3gJ3OxJsAIKgBIDqdc6INHzEQjQNYxMH7qG9k-tFY50bDHjACVjWNhoIP30PRl_gvAagXBpLY2vAYoqragTK4WWSrT6XLdZc_reA5lu30IhiBemBQLk6YdN31V3ZGZV32Is7eUMVT04Ixofg9A4CDyIW2Yfe8XMcKEfxqQe_Mm610Jsd6ymEt7sd7WQVAI_gxuldo32QLQCaFWJIhe1uhSyAmj1b4BWMo2-_PUvTJ6sjmvWUKJoAZWYD2Vq0-aXRGwBWtX1U__L2UnxJyUKoBUR2y3TDz718jAkuCRpWAS0DKLSd1HhlqSI0jCIPOrHURom8OuGkQ38ivW20WP1zPkzBIHL2SMj0IJ62HQ7CjKNB85MJzXmlWlHKymEOgbWwWWc1G1Bh4Zs-aB_3t1ydbkBfuahWOsxvX4G_Mx0jR9R0nITDQq9k_RObBlXUbA2z7kQ9fA71bqypqFSMcEhiNxBMWt-v-XqN4CSa6a-sEJt9LgnXFvvjwCKIEDoM65bClkDuVAQc_ibkzMFDxCedDdACKAYlpjVtLg8dotrTB6VxIQexyHgZvcKk0dYtNud7XYvgZveSVFJvIVYVu2WctV07Ipdt8zGzxza-xlamTVwcG9s4yjZ8keAVrnerrYbOlXxFcvSCaBTQUdojXi303pbtWvVZQOdraYIOs4-iRzcbJ3mmSu8B_6ScUVr6JRcOE9U5qKhuh8699BxKkIcJURNNjo4-MtvItXCDce7ZiMUdEoiaiGdguGKi0Yx0tg5jLtNmz8i6HzBdQ2dL3SvJLaCjZKMKAfXDDeM65ixaEQrNds3wM08TSfwF1SUwL-BOywbKnVaoLyAooQlqylwM6TFFjpzVJRTiTWHwM183fyp5Vxr3uGmgQDFq5YT41B3uuED5rjShsVQcLgVRVtTLTXBgWLtF8EpbX8kEVxm7xzg3yyzd_CWN0q2Vv89ral56pSX_cRafeDaSBybqIl8F7p7t__PJ66Xx8loIzXPjX24k4wr43QPxidRMghJ_HUtGiUp3potsLB7LDUh8r_1PoCu3X0HrA_2yPcmsPOyTGJyCvaippi3u4_8nlVc79IhDuiMdl6QFsYAEk1BBqSIE7jQHvqJEvFE5bNF9QvmRa3nSjreJjILwRXdq0uy01vdNf9b_X6nPy5wTgsUoBC5nTk1ywFa7ZNoHQVOzXi7dyre2g5y2YjLyEA2QwbAwVRhGqUlgTu1kRQX60dW12_TbsYP2sM53CCOYNUYCt4KO4ijQXE0VYySuPQhzoVUb1NrBg5q4yO1Xv5mhV4-KEymCv2UptHbFJohg8J07GABLSISp6NdcAgEy-ydbamoWgjeKDxNiXYrLMZDl-8FgUTLdlt66Lv5_HAiaZ5vH3WGWDP1Xp_EKBQVceKGejrMBX_eiraBHG9pszNxKbUg_0iiZfbuQSyzd7f3tLaNW6zI5pYXdP-JklY27InWz5NQdr_8bHPz4jsm0IqzopC0aT4IXZ8YoqaFRgo7wR7NbB9r-7y5fSRJ_5fsQzP70hDhH7evQ_SPstCfWYjz1P0hCxuzZd_fZBrVS3adaIx-fvv38BBMeaC5R-If4mGxoeRRH4xqur_DSlHJZ2z8ZtYrm-N9ofnA3fwYMBLa4rr-TIkS8na7q3UhpgrbtcNMAn_x6mL0k_s3pnr7TtLCSRQv3Rz78QtRfCDIturScyG2W_ENdg4W2ysLG9KzU35-vghujRgieDTzC5eU3g_5hTX7JWO_h-14xrbnRvmrbC_FqMAe1dfJuWnTaAbakilWz0URfhWr9ol3lGe8uNkypVP_2WEaIAPMdAbTj-lLZch8JbO6vsYNI9e1II_NZF0P56WhCjmvERrmwQjkzowIMHZfNUK2_CP_gMmGcdrjnRhx1Hd2KzTOwQpv5t1hEJTfsOI9rTB5_qfYYtAOtkzLhjIMXDR2qxkcfaoeGXLSgmPolzss1aUmEJ7Qdxw-0CTT-2GYh_GY4NWdHtcf7t8M50wHUQtrYDKYg0597ztAfzC3ElMf6JrODzj1vQFwOANMvGIMuB657Qi6Tdsd_L8HtgY2wJ6kOZ_mAfZ92F9z6pPTlqlrTB4pLz6aqzOAklH3cri2uuEV4309NhL5heKCynuKJdl83Bl4k1PaSLTLA69IPWBZUfWK0HvMq1Mio8CiJOPVJ1pOm3ves5nCjoSsc__xkFuuZKvr-k-0XHB1p6aV11PZ7fIVq-n9c6Po1tRaC3io1lrO_mrpejcbKfHX9e6rZIqu-7uq0aCClrit1bqgNVX0lYFdfXfKJH28brfaj7Lz-pr1psHXpnVMmPhhSL-Fx7qPuWl6kJg3tbms_J2zmRNm9w_djdPZA7wFOZgwKW-i0MehR8Ym3GHZ0Oz-YQrwnm5x538_7QqiAzNATedsp35yYrN1Dm03-56SVtHs55SKFsIB4PQeN0h8mubpGOBK6kU9bLkxwrNjs7MP2KZFSZzTKKBT8uxst-Zmyr7wOObvZWPO7acW4YB_UogEKUqxN8HfIR3MeBIEH6M-MvPMIaJDNuCe1CouyT1UlJAQb929jB29L5MSP-vo7S-mp8QuzM1Pjk-CFeeGb_EN6IMpepzQGMOe6oX3YPZ88q3z-7Eps6yldXTBbnLKKCR7ovK4-vOnR_WQRHmSGjJGSvvXLWtp-DS9douZvKFFCK7rHJPHdck1zMFF7MSduyw8fbTHvJjv1pPrdshkwiRqXE8vLA75-ZC7DgPWa7Lfe579I9enMZ3nmMZkKJwI64a1kpippu-eqcN1rd1fyFG_FsmGSG0cxxJuhgAU13ibFxigeKDKfnSgRX8V-YnFiGavVwqEgtE6nHqJYns-tfwel_OLw2-v23lfFBmsg6vPcjmJvbiE_89uMTuanV7_ZJaTi8ArXmTNrBc-yn09lZNAPRuoBV6qjL8hmk2KlJFhZ6sAtMGDE81LFBq6b6bjV5E3L3Pxq8jfs0a9dAR49f60u3L9XvqGW9SfSaKm6UBiMC2jwjRMSPgS4OXoeVICnMj9L5H_N5J41urTEDPQ5s1yNfVQd_Dta40etgkc2dEN_UuZ-HzVhcE0IJ7UdG6eoCANzEdq55vSKh2mnL2uR2mRvvF1vRkyKAzmCmngwvVaj1k3Cku1Hhn03VPQYDRFOC_CUkShVX7OtdFqu0lH3zhdFFd-kfopvqBXXuz7QZSkiX-xuaKk9Iq0iEiJCg8lRUT9CJUF8fwkwl7oXbAr5KLAQ27kxm4aoEvXD4s8iRCheRiHbgACl24xqy-1C14KWV2wpmnpleclqR9c1DindWM-HEWoA4pAuLyQV-YTtbytGhC4NWtUM6hQTNXma1M7IlzaDzkOX5P-7R-VXbSyvnrz54CGiQagVUfG0xX6TwAAAP__nKkd1A">