<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/139383>139383</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang crashes with inline ARM assembly since clang 3.0.0
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          mariete1223
      </td>
    </tr>
</table>

<pre>
    When compiling the following C++ code that contains inline assembly intended for ARM, Clang crashes with an internal compiler error during instruction selection:

## Assertion

```
clang++: /root/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:530: void getCopyToParts(llvm::SelectionDAG&, const llvm::SDLoc&, llvm::SDValue, llvm::SDValue*, unsigned int, llvm::MVT, const llvm::Value*, std::optional<unsigned int>, llvm::ISD::NodeType): Assertion `NumParts == 1 && "No-op copy with multiple parts!"' failed.
```

## Stack dump

```
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 -x c++ <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 0x0000000003f8ac78 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f8ac78)
 #1 0x0000000003f88904 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f88904)
 #2 0x0000000003ecd6f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x0000754065042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007540650969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x0000754065042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007540650287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x000075406502871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x0000754065039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000005238227 getCopyToParts(llvm::SelectionDAG&, llvm::SDLoc const&, llvm::SDValue, llvm::SDValue*, unsigned int, llvm::MVT, llvm::Value const*, std::optional<unsigned int>, llvm::ISD::NodeType) SelectionDAGBuilder.cpp:0:0
#10 0x0000000005238409 llvm::RegsForValue::getCopyToRegs(llvm::SDValue, llvm::SelectionDAG&, llvm::SDLoc const&, llvm::SDValue&, llvm::SDValue*, llvm::Value const*, llvm::ISD::NodeType) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5238409)
#11 0x0000000005258810 llvm::SelectionDAGBuilder::visitInlineAsm(llvm::CallBase const&, llvm::BasicBlock const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5258810)
#12 0x000000000527af47 llvm::SelectionDAGBuilder::visitCall(llvm::CallInst const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x527af47)
#13 0x000000000528e76f llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x528e76f)
#14 0x000000000531d3cd llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void, true, llvm::BasicBlock>, false, true>, llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void, true, llvm::BasicBlock>, false, true>, bool&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x531d3cd)
#15 0x000000000531e295 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x531e295)
#16 0x000000000531f5d5 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x531f5d5)
#17 0x000000000530fe5f llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x530fe5f)
#18 0x00000000032ad66a llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#19 0x00000000038cfc9f llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x38cfc9f)
#20 0x00000000038d0051 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x38d0051)
#21 0x00000000038d08f1 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x38d08f1)
#22 0x000000000424368e clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, 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+++0x424368e)
#23 0x000000000492f380 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x492f380)
#24 0x000000000660cd6c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x660cd6c)
#25 0x000000000492f768 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x492f768)
#26 0x0000000004c254a5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c254a5)
#27 0x0000000004ba434e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ba434e)
#28 0x0000000004d191b9 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d191b9)
#29 0x0000000000da8bdf cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xda8bdf)
#30 0x0000000000d9edaa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x0000000004996369 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
#32 0x0000000003ecdb94 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ecdb94)
#33 0x000000000499697f 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
#34 0x0000000004958d9d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4958d9d)
#35 0x0000000004959e2e 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+++0x4959e2e)
#36 0x0000000004961c85 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4961c85)
#37 0x0000000000da4b48 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xda4b48)
#38 0x0000000000c2a384 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc2a384)
#39 0x0000754065029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#40 0x0000754065029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#41 0x0000000000d9e855 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd9e855)
```


## Program

```
#include <iostream>
using namespace std;
int main(void) {
int a[4] = {1,2,3,4};
int b;
int c;
__asm__ __volatile__("ldr %1, [%0, 1] \n"
                     : "=r"(a), "=r"(b)
                     : "0"(a));
}
```

## To reproduce

https://gcc.godbolt.org/z/zahxKxnM1


Generated by fuzzer


</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWltv47gV_jXMC2FDou4PeVDsyXS2OztBkm77JlAUZbNDkSpJJfb--oKSbF1szyRovGjRIEEkXg6_8_HwnEOKWGu2EZTeguAOBOsb3JitVLcVVowa6iLk3eSy2N_-fUsFJLKqGWdiA82WwlJyLl_t2wqgO4DuIJEFhWaLDSRSGMyEhkxwJijEWtMq53vIhKGioAUspYLp41eAVnDFsdhAorDeUg1fmdlCLNqWSmDej0oVpEpJBYtG2TGZ0EY1xDApoKactk_AS4HT_iIPIA-mWlPVVnSlodP_Oimxg3a4gZdCgO6VlAage85fqkWt5D8pObzafywH6H4lC_qZCoDunw5DrtPPs9e7hvGCqiWpa-ClgedY-S-SFXBDzUrW-2f5gJXRAMWtcC8FXjqVF1paiBTawFGT9a-S9HXj0t8xb-iFwtSWN6Kd48JSOm339ffncyONO2tTdIWytvAwB95qItD7NJX55WndPfwmC_q8rylAiWXgOBcQhM5vTdVyAIG3Bt4aurBVLIQAod_kQtaQyHrf2ULVcMNqTmHdseYChACKYIkZp8VyNq_D5D8ZTL7Doqnq09kf1bUm4yyBkzwouVG4glhtmooKo3vDkLU1hIMZLuiu5lJRZcusES3wQTO9MKoR3wG6z5k4VPdrY7EpXrEqFz5cbOBCWrm4rq30xtSNWWq4qCyJcLHYxeEC62qh98LgHfDWdilwuCiFXLxQlUtNbT1cPMHFYkPIwkjJyRYzYdn8EV7bWAtc6600cFESyaVaFAxvhNSGEd2N0a7EafEOkl4P4K20bBShduKd1LXEAW9FZQm8T3aKNFUQG0hFAWUJS8YpcFJkm9nVAzdUUIX7NenZ4sdGCLuia6w1BCi6b0S3rB9swVcs8MaCj6AUsJJFw6ltNcGBImsG_jlp_4hDuE4_L4D3aZ1-hl9GbuO45nrh5WFgK953KksoioBjjcBzoLNzDj9eGWMSxSOr13vdPTwoJkxrXs8KEzpZ5Aq_ZlIbRXHVr-N2RSYQoPiD7AygO2fXw7MLrwPvzsDHieOfA7_iFIum_iae2MYudRQflzqXdohrQLVgBqhoApWSIixjuLIW-UiJfKFq32H7CxYFtyPGPYeTNispDN2Z3gc77V8n3-vlR4HvhIHjowA5vVKdj9_FYRb6C85Es1tsRNNVkKWWy7CF3HYZAPtTgUmYlATWZqsoLrLvjPP3SW_7D9KDOVw_CuFGtxS8F7YfhYPgcCoYxVHpQZxLZd4ntu04iI1OxLr5uwW6-SAwngr0EpqE7xPYdhkEJmMDC5AXIxS9MzLPYnIXP68SmWcx-TDSx0VmeDlzOawa6z-cOWm-k4wkP9KNvpeqU60tORJqq6Z8nqXlPyb5Unn6Mxp_wk-XG32w1-sZ7IzS8utO-Q3i2HUu0NNPUlfxwjQzX9ocO9XVhOcV5vwOa3qBuDusGbnjknwfsfHh7r1XZVAUTRWNcOlHb1bUqnSio43oIx2voEILclDBm6oQ0ygs36zCBP44GbmqBi3GQQN_ooHnFh4pLmjw5YnycelgNhNNGGfaZMzY1E6q7DXLmU2fV_MWBTWY9QKFLGjW-a5p0xEt1maN6rxFibluH-xealxxzqh753fs07adO8T_JdS5lPxK5tEZwGAewcw8KEqCN5pH2vqcXpup3z-m9de09A7soEo4U6UMip-rohrxTXzFZMsEPaCeqHJSdyVdLNpBl2iqi1PS4JLfsbr8SjeY7P-7NGoxDxrFk1wf4SIMMbwIym4HR-qc1eNUgWWNlVnaCATPyDuT6kzyQy8mJUnGNN8_2H6HXem74Xzo3qkDd-QTTfeoceE4gfsG6F_bTfXUHvqi68BugQ2w3TnsuBzD5iNDHinwpaqH9fqngo_LEfhJQuMj3wtjCrteLRhaMXOHyXcqim_tSQ9A8ah61UOy0QMLckhkJy3aM8dvfcg5SXSNYmLzSMvZ_qHnIJ1J66Gkxzg1DmBGNZq90EdaroR5MGoS317KfvXdM06f9trQqg9Nx41II9i_GprVs54Kv2b1q2KGZofDj1Gngpa44TbIcmroTzp6n_oxT1VaSaGbys7pNRLZfmaHeZ9kgX6CSi92foSqLewOLZ4VFpq3Z2B_E2xmEOnTc394cR0D7qEOikySwTB0SBGSsSIPWGmaPj1PYT7RCve22GUmh_8fDriHNAAO5sxHYXxmwaTHLwJe-mlHSWPowerjK_EahfEAc5J6-AQFPg7GMO-VbL-FnMF5JYQdhgHhJKHwc-x7PoU_8k1nubys0nXst8M5aDFJIvzCTdw8GWvR4x2UeZEEn2I_dcRXcSMdvgH9JNtwChznRQkJcbPu9HkU1VKl8N76eW9FtlgNu_beIU7KjvuNayjRoTzqMD0ad4qEFhjDA-0r97n1C-MToApz_jslRvZB_IxCsyhnZfRucbJ_KBR7OXdgNT3x9pMk9MKk-wg3CD2c92eqZbWt7ZZeG2dsE4I5zzH5npXCwhzMpRu4N52Vu5JVhUUxX8VnZ-_cud25eH6MdccOWUZ2O9ftXnK7z7JxkVlMLYWTxrYgMwp3W9q2eiYOc26XglSjetskHbx5ejwC67oAFHFc5QUGKBqoQvHh68AvMj8zGSdn-nky_vxw7uS-P1dsxBMuKd9PuPzxvF0h5-sQDwbvzY0riUr4_2wcs43WeSvwp6wFcZEUF1lrZw2fRMYDlRPXPetoG0wOPd_WNJ2kM1c6-O3VHkxplswECUX0vaT8InN9mZFfZP4rmxyRTrYPJ774aAE1Znby-08TbyWxN5M_hUpL1kDlNOFKQpfEwSXY69HzJEE4kxlcmoI_kcorZKstPQN50SwP8XO_T6oPmcgBfOtK0pOPJ5ci9IfnHhbZgHuS_TkEYS_2oUX80QN3ooeBk9mHzqRI3vkdue1yFOg7c4HUd2CW2T6ZNliZbKTWm4eg_mgId56oxUEAO-EfPk-t8H7o2fWc4w2d_sLN6fUcgDwmCG8KCu2ykcPu30kbzcQGClxRXWNCu4h1B5yUCQN7W-1y3wSC6FCBQXDng2ANgbe2xS5AKwTQygNo5YNoPYjIh0fSPWYZ1lWWwSx7kXbtc5plLV2IFwoCFFhhEAR3AAWOfXTbgYKVAAgBJ4Xnfrq7RQh4a9XeZ4qxJcvKGRcePoT_QIIz7p50iK1Cl65FPUuoaK1k0RDaVWyNqduzHXTf3RFabmSRS26WUm0Auv_D_uHt7q878dU9zuHn7iIPLWC-h2Xzxx9UdRU3xa1XJF6Cb-itG_lhnDjID2-2tyUq_MQJYxziKESBj3CUuLikSen7XhKUN-wWOShwAtdxAzdC4TJOvBhRlyR5nITIocB3aIUZX1q_Y9HdMK0beut6iRd7NxznlOv2KiNCvUUiEKxv1G17qy9vNhr4Dmfa6EGEYYbT2zOXEPu7i-nj1-H-omaC9AEaektn6dw0it_OGGRm2-RLIqvR_cHprcIWtgbovkf-cov-HQAA__-fraCY">