<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/73275>73275</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang-18 crash: cannot lower memory intrinsic in address space 256.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    Clang-18 with -O3 -fsanitize-stats -c crashes on the test case.
Compiler explorer: https://godbolt.org/z/Ydf9Mrnvs
```
$cat mutant.c
void foo(unsigned char __seg_gs *a, unsigned char c, long n)
{
  for (long i = 0; i < n; ++i)
    a[i] = c;
}

$clang-18 -O3 -fsanitize-stats -c mutant.c
fatal error: error in backend: cannot lower memory intrinsic in address space 256
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: clang-18 -O3 -fsanitize-stats -c mutant.c
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'mutant.c'.
4.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@foo'
 #0 0x00007f306f94e266 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd2b266)
 #1 0x00007f306f94c170 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd29170)
 #2 0x00007f306f94d8c4 llvm::sys::CleanupOnSignal(unsigned long) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd2a8c4)
 #3 0x00007f306f89b9ae (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc789ae)
 #4 0x00007f306f89b96b (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc7896b)
 #5 0x00007f306f948a67 llvm::sys::Process::Exit(int, bool) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd25a67)
 #6 0x000055836735ec23 (/usr/lib/llvm-18/bin/clang+0x13c23)
 #7 0x00007f306f8a9c4f llvm::report_fatal_error(llvm::Twine const&, bool) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc86c4f)
 #8 0x00007f307017104c (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x154e04c)
 #9 0x00007f3070129658 llvm::SelectionDAGBuilder::visitIntrinsicCall(llvm::CallInst const&, unsigned int) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x1506658)
#10 0x00007f30700fae0b llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x14d7e0b)
#11 0x00007f30701962a6 llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void, true>, false, true>, llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void, true>, false, true>, bool&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x15732a6)
#12 0x00007f3070195b71 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x1572b71)
#13 0x00007f3070193cf6 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x1570cf6)
#14 0x00007f307252c52f (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x390952f)
#15 0x00007f306fd02552 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x10df552)
#16 0x00007f306fa940df llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xe710df)
#17 0x00007f306fa99dc3 llvm::FPPassManager::runOnModule(llvm::Module&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xe76dc3)
#18 0x00007f306fa947d4 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xe717d4)
#19 0x00007f307813109f 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>>) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x1ade09f)
#20 0x00007f30784c75fe (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x1e745fe)
#21 0x00007f30770e3866 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xa90866)
#22 0x00007f3078f3b645 clang::FrontendAction::Execute() (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x28e8645)
#23 0x00007f3078eb9cc4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x2866cc4)
#24 0x00007f3078fb61c0 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x29631c0)
#25 0x000055836735e837 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm-18/bin/clang+0x13837)
#26 0x000055836735b905 (/usr/lib/llvm-18/bin/clang+0x10905)
#27 0x00007f3078b51909 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24fe909)
#28 0x00007f306f89b94c llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc7894c)
#29 0x00007f3078b512ae clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24fe2ae)
#30 0x00007f3078b190f1 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24c60f1)
#31 0x00007f3078b1933e clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24c633e)
#32 0x00007f3078b3539c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x24e239c)
#33 0x000055836735b25c clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm-18/bin/clang+0x1025c)
#34 0x0000558367368f32 main (/usr/lib/llvm-18/bin/clang+0x1df32)
#35 0x00007f306de32c87 __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:344:0
#36 0x00005583673581ea _start (/usr/lib/llvm-18/bin/clang+0xd1ea)
clang-18: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Ubuntu clang version 18.0.0 (++20231018091808+48a53509e851-1~exp1~20231018091910.1571)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang-18: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-18: note: diagnostic msg: /tmp/mutant-786ce9.c
clang-18: note: diagnostic msg: /tmp/mutant-786ce9.sh
clang-18: note: diagnostic msg: 

********************
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzMWktv4zi2_jXKhrBBkXousrCduKoaqZsgSfe9dzYGRR3ZnJZJD0nl0Yv-7QNKsi069lSScjemUEBk8ojnOw-eBylmjFhKgMsgngbx1QVr7ErpS8HWTCr5ulaN4eaiUOXr5axmcjkKM_Qs7AqNbikaVYZJYcUfMDKWWYNGHHHNzAoMUhLZFSALxiLODIwDfBXgyUytN6IGjeBlUysNOqATtLJ2YwI6Ccg8IPOlKgtV27HSy4DM_wjI_P_LKv-u5ZPp1ggS3P_vfpKIM4vWjWXSjnk3-KREiSqlApI1shWxRHzFNFosDCwXS4MCMmEBmSF_mruhWsklkgHJewbptHtAqFIaBSRrCQQK6BXCAZ22jzMk3WNApgGZit3LCCHEgngqgviqfYEHdLpd96p_2MmxVfEp7fpCVsyyGoHWqlVj-4CERAXjv4Ms3RhnUiqLavUMGq1hrfQrEtJqIY3gjpaVpQZjkNkwDojESbf03c315OEamaZYC4sYKpol0rBR2iKrDg0m7KopxlytAzKv66ftn9FGq38CtwGZC2MaMAGZIyZLJCSvmxJaB2n9pUVsNePg1L_RsNGKgzFQIqMa3Q27N5kxigtmoUS6kchwLTa2d60Hy_jvqGzWG4esHcJjdKfVUrM1YnrZrEFa02rlY3oOx6j9F9AZqCqg12jDtAGNmEUgS6QqVIkaOmLSE89UCWgJEjSzQslukvaT942UQi7Rhhnniem8kdxRoTs38J1JtgQdkNRto7Uqmxoc1Q4VSXuZoxPr_V-WoKvJl1FAr68mX9A3aaxuOg4PUEP71C9fbVkHJA0i3O6ZtPfdgFCM8AvGGKcVxUmVR0CSBLVGppOATsyr6R7utJC2NcFjZ8dsT6TZ80IZq4GtA5I4WwppA5K7rRSQeWO08xhRbP0mdKOFkAGZj8f7KVHc3Pz2fRRmY6PGYUCm-KUkBUmS_WYLCA0PAPMwxccA3zfyQSwlq78yWdagTQvmLJjyMMUeJnKAqcx4dAzTrAYmm81tj2wYvFzIORM8lvHIg0c9eFle5Ax-nhFPs5yBxyh6wygpzsMoKTxG8YHCM5akx722jTPdj-sXYQOStb45Q4VS9ZkUHrMk9eAlPbw4zmiS0hg4oe9g1Iatds2QckK9JVNftSznUTWQuIvdizZjLLqMMdyhj89CAuJKGtvv0LOJz7OER5WHNRtgTXGYhjjiP88ojCPAEfc45T4nkidxNtDKLhZeTb5MG1GXbT0S0MmTMMJ-2-bJGatrT11uwMVUT2O7rXqu4BbGOEnibF-HEBpiTyBcMcDFuwXyZBjmhL0Y54AdlSngwoMd-nbIE8KSE7C_PUA9HJ0yI_i0Vvx3D76ohbELYV16VXrxvCiEy-2zQ4oSLBP9glKVsFAbx8gnHejCWbJitQHvwZWT7q_VDQT02psbjP2Xw-v29JmsHKeUsMSzMjmwclyk4TutPKnrvaGNZ-ldbXReL41TUqShh58e4Ke8-rGX6kbeyu-Mr4SELVQP_5u5swmAeeUbYJhfUxITHpPq5znRHOcxqTxOfoItMYljgk7K7KragbaOquns-sFlFcfEQ514qFke4XKYJOd3Dui2-v6b8ULqEHtw0wO4ecnpO-B-bxsG3wf7oXNBTUpOPajZoWbTcljh1rBk_LWvufagv603-130lwIO0zLyAHuVQRbSEOdV1xf2xeBa2GnXR982dtO45DmYvhJsKZWxgptruRQS-iJgQPIVWAn6AZjmq9suqnv1woDU9YpfQP6A6pHpJdgfEN0wuTxGMghjrqpZ3kPlD281PjlYsFfCZJd-hnnJ6saIJ7iHaibtndVe2nqq-k0_FzU8vBoL6z4RGVt2M40U_2pgsTl40zWMm2ctLCy2bePgpRIq1tQud9Zg4Qcv0uuW58edqDsj4JtN60ZZF1NYCTj3NinxKrIs4mlcfbx5OsoM0iiuwGPm1VEpBpolydBYd0wbmDw8-s76AGvmlfWfL--PAWU5zhIvERGvEsgqWiRRPMQ510ravVf17RfwxsIn2_BjwEgGWRLFHjIvx2dQ5JxH_lbsDihdzcUkBw_bdhNkp0X5XMQ6jj5JOPeiFol8vRZJyLEXtTqceyGeFGdvMb8R0u36M6HOExpy7KGOD9vdjKaI83CxZsIP-xOt2asLTXTWHcd2EWzSxw1_bFf4vhP8sH3OaOpBPOzIixzHH1sS59j3tNSzVRGHOT6TiqMKcpx7zLI3JysRH0TqmWZmdQ9cPYF-nTmHfbH7YzBWQf3q2WF7KLjQrS3a0_RuY34ymh49tBk0606G_FBhhMHQuUstnraFzmwWztR6zWR5GDyOOtMud3TtFau9rLHPiH22GCSbxYK_vIRh96NwLYrLLMJhal3UI3YDC6tZ1-u10wfLsbp2O1LpwbwjmeyDcuvNrZOfzVsI89II9XNWEea4Ck9quo0V7E2c3qrfCywHLzqCU4XKfyCdHJxBnVMZPMGV1_V5B8atMig97XYnlPGLKsxpTfyiihtxcFo08L41q-vfgFvV18N7b90w4RylP5F8r_J6l_oLVUip709-ui9oTHN-Cu7V4NlLV0fy1CnV_40qPFfIBkJzL9ztTt13KYfEvdK2eXELug0zkz5IDA5tlar7WP7Bs5Fh2iKxDyvyYSVZRQlygD62bllRr_f2j-RLoIRnKVosnMIWxjJtFz2TedGIugzIfOnmRrPffnn-R7H7ScYkdZxMs1V899hOtuuMeUAnNIoCOsF79ocJPguBoY7xhwQrQ2A7ubb3iLvb193lIqr6shDx3rcqJmoou8tzeBHOZCWgFDvujQE0ekJWIQOAxKBq6xn9WjTSNv3ST6CNUBKF2RiPcYd-GpApwYSGOMxwHmbYjUUZi2mMc8jicBT-CS-b8M8BUR7icRgPzsC6BtPJ8JIliyQabfioFrJ5GS1l05OsNLASrVXZnn-hjTLipZtqi8m6hvJKtHrYqdSp8I26pHKt2wSVu0Yarc2yfa-32U_8H9yq9xfZk8fHyewrevx6jea3Nze3__vtf76g-beb6wf0eNsOT3_9gu6v727vH3fXx3fHLqIz4_bYycvoHYEG1KZ6KBGzuyXfqQIyt-tNQObdje8ozRIO-fY6-qfWMKtP2OJcFtl-uHFRXtIypzm7gMswxTjNCSH4YnVJU-CE4TDNqzQMqzzMi5CQLM5SlhAWFRfisnXgkESYuDfHEYQkizDOw4rkGNMgwrBmoh67LTxWennRfntwmVKSxhc1K6A27ccuhEh4Ru1kQEgQX13oy3bbF83SBBGuhbFmv4oVtob9NzDtZwuf-8BifNHo-vLzn1C0kvw7AAD___CndRo">