<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/115299>115299</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang-20 crashed with cpu_specific attribute. Assertion `V != this && "Illegal call to this->takeName(this)!"' failed.
        </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-20 crashed with ```cpu_specific``` attribute.

Compiler explorer: https://godbolt.org/z/e7dxPjYd9

```
$cat mutant.c
void __attribute__((cpu_specific(ivybridge))) a (__UINTPTR_TYPE__ x) {}

void b (void)
{
  a ((__UINTPTR_TYPE__) a);
}

Also crashed on clang-19.

$clang-19 mutant.c
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: /usr/lib/llvm-19/bin/clang -cc1 -triple x86_64-pc-linux-gnu -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name mutant.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/code/reduce -fcoverage-compilation-dir=/home/code/reduce -resource-dir /usr/lib/llvm-19/lib/clang/19 -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/mutant-922ea3.o -x 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 '@b'
 #0 0x00007f42ff9e0246 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xea7246)
 #1 0x00007f42ff9dde20 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xea4e20)
 #2 0x00007f42ff9e090b (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xea790b)
 #3 0x00007f42fe618520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007f42ffb89b33 llvm::Value::stripPointerCasts() const (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0x1050b33)
 #5 0x00007f42ffac1577 llvm::diagnoseDontCall(llvm::CallInst const&) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xf88577)
 #6 0x00007f43000fd6ec llvm::FastISel::lowerCall(llvm::CallInst const*) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0x15c46ec)
 #7 0x00007f43000f8e26 llvm::FastISel::selectOperator(llvm::User const*, unsigned int) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0x15bfe26)
 #8 0x00007f43000ff5b2 llvm::FastISel::selectInstruction(llvm::Instruction const*) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0x15c65b2)
 #9 0x00007f43002796a8 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0x17406a8)
#10 0x00007f4300277e12 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0x173ee12)
#11 0x00007f430027693a llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0x173d93a)
#12 0x00007f42ffdc0738 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0x1287738)
#13 0x00007f42ffb2e6f4 llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xff56f4)
#14 0x00007f42ffb33fe3 llvm::FPPassManager::runOnModule(llvm::Module&) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xffafe3)
#15 0x00007f42ffb2ee4e llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xff5e4e)
#16 0x00007f43084ebc7e 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*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x1e20c7e)
#17 0x00007f4308891132 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x21c6132)
#18 0x00007f43072fa739 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc2f739)
#19 0x00007f430938d0b5 clang::FrontendAction::Execute() (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x2cc20b5)
#20 0x00007f43092fd2f4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x2c322f4)
#21 0x00007f4309409dee clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x2d3edee)
#22 0x00005609ae370bc5 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm-19/bin/clang+0x11bc5)
#23 0x00005609ae36dad5 (/usr/lib/llvm-19/bin/clang+0xead5)
#24 0x00005609ae36cc9b clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm-19/bin/clang+0xdc9b)
#25 0x00005609ae37af36 main (/usr/lib/llvm-19/bin/clang+0x1bf36)
#26 0x00007f42fe5ffd90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#27 0x00007f42fe5ffe40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#28 0x00005609ae36b765 _start (/usr/lib/llvm-19/bin/clang+0xc765)
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see invocation)
Ubuntu clang version 19.0.0 (++20240722031324+65825cd5431c-1~exp1~20240722151445.1819)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-19/bin
clang: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/mutant-dd08a9.c
clang: note: diagnostic msg: /tmp/mutant-dd08a9.sh
clang: note: diagnostic msg: 

********************
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzEWUtz27iT_zT0BQUVCfAhHnyQJStxlTN22U5m56QCgSaFCQlwAdBx9jCffQskZZGK83DGu_-UK5KARvevG_0A0MxaWSmA8yC5CJLNGevcXptzyRqmtPra6M5ye1Zo8fWc10xVmISIG2b3INAX6fYoSMPhj7fdzrbAZSn58yBizhlZdA4WQbgJwtXw_1o3razBIHhqa23ABHSF9s61NqCrgGwDsq20KHTtFtpUAdn-T0C2kImn27__EvmU07Ok8SeJOXOo6RxTbsGHwUctBdrtnqHsdgFZBmQ5Q0yW8vFrYaSoICD58IcYCshyt_t49cfD7cPd7uGv28vdDj35qSC7CLLNFEovpvAr_DfPYZjMLoYvaGD3AsdelF9ALw5rZpxXtdXPVtcKDTsR5TObetXH8RP9b68vV_eXyHZFIx1iqOgqZKDVxiGnT80u3b4rFlw3AdnW9ePhA7dG_w3cBWQrre3ABmSLmBJIKl53ApDbwwARFYx_doZxCMgatQZaozlYCwJZ3Zlh2K9k1moumQOBTKeQ5Ua2blTp3jH-GYmuaT2yfihcoP7frdGVYQ1ipuoaUM5jRwHZdtZ4rLI4II7ygGwLqQKy7Q2DMOcRws7Itgb0tEx3aYxbjmupuidcqQ5haKTDuvgbYS9aSIMYRlhIy4oacGkAEOY1MIOZdbiAUhvAXl9Q4kjXS38EI0sJph_mzAj8yOoOsGINWIQbJhUuZT0MPG8Ywo2BWnPmpFa40QJq1EqOcCs5ruERakSGH9LiVgLCTWlYA7jVUjkfRxtW1wiXDXN7DMYojXBZtphr5ffEBXSjFcKl0tjoTgmpKuxpEW64VtaZjjttMKslsx5n2akvUgnsvGY2oBuCsGOmAod523kr4jRG2HUK-oEKFBgPWEDRVRUYPyVVFdBNJQqEy34c8z4BDFoK6WEHZLvXDfjN0sJ_GBAdB4RLrh_BsApes8jA4Gue7vvOMfzunSMg2yhHuDeiYjWW9qt10Pz6Wh8YYyj8iIvmrP5F0l5AxXlAtqOzPnuqlxgFZLtYfPvfC7TfSoMn_4V_K3UkfYHPj1e_XgTCJRijDa6lT0ve-mWlOu4jx0qtArqJF2QRIVzaz7LFWhjM98A_Y6lw1ZS9Z9TaYCFZpbR1knt_ZUIYKyuEN7vdu_V693716XK3-XN1tyW79fZqt7r_ENBNhLD2iFzTBmQ7RB_OCQFGFxrhJ8RPcmg0Zp-ArkGXAb1ELTMWDGIO-eDXJfLRPBCTkXitBQwR0TvtMEnHybtO-cBALbMWBSTbdop7KnTrBz4wxSowAcl8wm-06GrwVM-oSDamyvg7_P5rmaLN6h0O6OVm9Q5djcHtJdxDDf23kX15EB2QLIjDwn8MJSsgNEThUxiGYVbGpCxzCEmcor4y0FVAV_arHb7cGqlcn7cfhuS_PBIZ9mWnrTPAmoCkvgBI5foq6uvhD1N379PjlCyurz99WFi9iPJFGJCL8AlYRuL0udh6wNEcsBBAwpcA33XqXlaK1e-ZEjUY24N5E0wxkHCGiZwaMQ-LN1E-97s1EUSngiCNlgkJR0EDnxfSQy0L7vmmPdOYJCfg4xn4YpkXlE4M-snXtdG2vrjeDqVozaw7mLQvLf9e3yhMwoLSGbhkBo7xKMmyCbgxOcBGK7dmdT1zSz_g42LA13vmG2x_uVwmWTYDmR5B0jAMS5ECn4DcMuuu7qEeftX6i7feT7Cu3gRrlPA4BT4Dm52AXQJJvwvW9qnkpvUpTpsZ4o8-PR7RrlGn-ruGeLPgj5KiBDKP_uUJ-jIpyE_QT1LjTIFpynxrq6dJQWa48xlukuUpW05wP6fszerdEf8wuqrrC2Ylv6g1_2xnKjwXlTf18CiLw5Qtj1ccQqPwBH8GEfkpftOpG_WB8b1UcIA6w__N3FspQAEiMlMgOlEgzSn7gQLXUDH-9T-uhsgpm6kxrzSChxmd-tEJEn_WmOjwIvg3R02WWUbn3kPnJYZAWsbTqL31QA9nov9nvGWZpGU8g3tSESktgf4C3A_9MW7uGePQW0FlJdAZ1OTUshDDBGo9ceMJ6KumPYbo_yngBGKYAZ7VymUMBc9gePEYAFw20l0MV-6bzrWdC8hyMr053gYuVSUVjAfOCcl7YALMPTDD9zetdxU7yY8zUn-CfwfqJ1QP_YX4J0TXTFUvkUxSjDNSVXdQzocPFl-dMByNsBqdfbrkSjnTWfkId1Culbt1JqDr4_RjOQb9VtZw31_PAnrpWVgnhplOyf_uYNeerPQH-faLkQ52h-P8ZJGAknW12wmowcFPFtLLUea3Kq21sl3jbz-_VW-HZzDetvO0AyTk2dzXZked5TKPIkp-hGdwn_668GCYssNjxEclT5xwdf-w1srB0--W3JdVIBFPIzovW7PzTkZKltF8qsKtv6au7h_mAO-hYaP_FVrXx8-3gspJmdF8hnR2wsnpUoRFMkW6Nd5kzw49BPsT8M7Bb97MvmNFzklYJFNsZHZ6yUkpSBnP88DwYO2PhExxmKE7RODy-8q8qRdwSsi8IJHZ4SWPw1zAPGkOSI9qPI5vjHPU36j5lgFIBAUBswAkh9NKkoY5A5qFBU8Q59GuYXJed1bGsK8-N9I137PJxWJMIrMxskbDG_wvwh-f8XyWiAo-dw06h5gKJpJXsQQm5hzjE46c58WwWQe1-wvSoFSvw2qe3h-0rsf88sqD_RGV4HkxQ5WcbAUraYo8ntfZryhpOuObzl4kkrIU-StfJEgu8nDGMzvlCXGIdju_bGcdM243Af7LUiCeS1me7FORpQka-L_KJjxLjw5wiDbUP376L51iRQ3IaQRDlCKum4YpX1TRPVQNKNfHKuqrqxfNtYG-OwLiB4yHrkc5ZqIDV1QyWYNAoutl2v4JzDPtLCD82I8BIDlJEaOEj0WnXDeyHV9pkQ_vxbihFwG5ICGJw4yQkEaUxAG5SJMlSbhIYhpxHP0DT230z4EoSqI4ThbRMjqWiuEw5fG_0KIZSfYGmEB9e8QTttrKp2Gqz1x1DWIjzU8bQ3O7Ke3PLCt0fE9Gje1nDi7xL_4mjbqxHbd6eFit36OH95doe3N9ffPn1R_v0Pbq-vIePdz0wxcf36G7y9ubu4fnJtjtS-20pe0biN9rqT0TGEB9awkEYu6Z5a_of_JQLkS4ZPnhafz3Gdj9a7fgrTbi0DU-E-f-Cp2zMziPMhrmWU7T5Gx_LsK8jFiU0GVG8zJM8jwpEhayMuJxSEGcyXPvxFEUZlFE0zBZLJc0E1lWcH_JIqQI4hAaJuuF97mFNtVZ3zg9j6KE5PlZzQqobd92J0TBF9TPBoQEyebMnPeOWnSVDeKwltbZIxsnXQ3f6cZPW9qT3jtaWQtmeOJPw08oIFFAN8jtpUV97UhRQMhV7W-DNeKsrn0a8NM4oJeOfYY_WOM9zQ_1vfHIIyXZmEwWZ52pz3-_kzza5PGc_G8AAAD__wdTvbc">