<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/69054>69054</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang: Assertion `isValidGCCRegisterName(Name) && "Invalid register passed in"' failed
        </td>
    </tr>

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

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

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

<pre>
    The following program `small.c` triggers a crash in clang-18:

``` sh
% cat small.c
int foo (long b) {
  asm volatile ("" : : : "r0", "r1", "r2", "r3",
       "r8", "r9", "r10", "r11", "r12");
  return b;
}

% clang -O0 -fopenmp-simd small.c
clang: /root/llvm-project/clang/lib/Basic/TargetInfo.cpp:675: llvm::StringRef clang::TargetInfo::getNormalizedGCCRegisterName(llvm::StringRef, bool) const: Assertion `isValidGCCRegisterName(Name) && "Invalid register passed in"' 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 -S --gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics -O0 -fopenmp-simd <source>
1.      <eof> parser at end of file
2.      <source>:1:5: LLVM IR generation of declaration 'foo'
3.      <source>:1:5: Generating code for declaration 'foo'
 #0 0x000000000372dd18 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372dd18)
 #1 0x000000000372b9dc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372b9dc)
 #2 0x00000000036742f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fc0d9e7c420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007fc0d993f00b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007fc0d991e859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007fc0d991e729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007fc0d992ffd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x0000000007aba0a4 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7aba0a4)
 #9 0x0000000003a45607 clang::CodeGen::CodeGenFunction::EmitAsmStmt(clang::AsmStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3a45607)
#10 0x0000000003a4854b clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3a4854b)
#11 0x0000000003a4e87c clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3a4e87c)
#12 0x0000000003aadde6 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3aadde6)
#13 0x0000000003ac0e8a clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3ac0e8a)
#14 0x0000000003b21c83 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b21c83)
#15 0x0000000003b1ce55 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b1ce55)
#16 0x0000000003b1d41b clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b1d41b)
#17 0x0000000003b26783 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#18 0x000000000499a9b6 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#19 0x000000000498ba78 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x498ba78)
#20 0x0000000005e9b4d4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5e9b4d4)
#21 0x00000000049982a8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49982a8)
#22 0x00000000041fc4f9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41fc4f9)
#23 0x000000000417d9ce clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x417d9ce)
#24 0x00000000042db54e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42db54e)
#25 0x0000000000bef0e6 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbef0e6)
#26 0x0000000000be69aa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#27 0x0000000003fd9c19 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
#28 0x00000000036747a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x36747a4)
#29 0x0000000003fda20f 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
#30 0x0000000003fa23d5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fa23d5)
#31 0x0000000003fa2e3d 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+0x3fa2e3d)
#32 0x0000000003faad65 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3faad65)
#33 0x0000000000bec58c clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbec58c)
#34 0x0000000000ae6751 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xae6751)
#35 0x00007fc0d9920083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#36 0x0000000000be648e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbe648e)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
```

Clang version:

```
clang version 18.0.0 (https://github.com/llvm/llvm-project.git f2b79ed9c6c858426b15a0374103ab901b5b2ef3)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/compiler-explorer/clang-assertions-trunk/bin
```

Check compiler explorer: https://godbolt.org/z/sPjofGhec


</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWl9v46jX_jTuDXKE8f-LXqTppO-sZndH09G8lxEG7LDFYAHupPvpX2E7qXHTbrubffWTftV0mmB8eJ7nHA7HYGwMbyRj10F6E6S3V7i3e6WviZKyEYJfVYo-XX_fM1ArIdRPLhvQadVo3IIgg6bFQqxIkEFgNW8apg3AgGhs9oBLQASWTRgVQbwO4G0Aj_9ncPwHzH5qQSkg2IKjvaGRSwtqpUCACqFkA6oAlSDIb8arAGDTgkclsOWCuU4BQgFCIIjXz78IaTi0b4bP0ewzmn2Ox89Hy8OPay9mfcq5Hc_o3Go0mi2D-IRTM9trCapTU5DfenI48k4pEP4OQVirjsm2Cw1vqS_I0GmktdVK2QBthXhsw06rPxhxX8ceaCt4FaDtDTacBGj7HeuG2c-yVivSdUG8zvLUmXE3O9fE63uruWy-sRocxwji9fNt4_eG2d-UbrHgfzJ6t9l8Yw03lunfcMucj15ac6JUSgnnOKKksW7UtTFMW66kCyBufmDBz1gb_5QgQFmAMiftZ_nougI9dQQdNoZRwOWgeA5qzAWjq1Grr18-re8_AdNXLbcAg6pvgGad0hZYBfbWdsaBRdsAbRtu9321IqqdFH0pLDemZyZAW4ClG5KInjJg92wK9gqTB6sxYY5yp1mnFWEDPKN6PTa7O7ExinBsGQW6l8AQzTs7Qb63mDwA2rfdab7AVQDLr9N8w7rpWyatmUJAdYPLVdtxwXTIDp1QmuljGIT4KLQJre7lQ4C2lRNrOwVbQ39iXYcJCBsQumm2xV3n7Pa26-3KgLB1KoAwPBRZiE0bmidp8SGIb7m0TIDwHoRhQ0holRJkj7kM4ts3gbnO5QqtXJgTJZQOKceNVMZyYkBYSxUOevrNL2ZFEG8mWeNPo1CREyqIN0zVQfwJdFgbpgG2gEkKVA1qLtjYE009nw3E6yiI18OM-PLlx6_g8zfQMMk0HoJU1YAyIvD0NUB5rVSA8tFa_Ja1u8mKbABR1KVQ_ZYtEKAYAniAx584R5RGxWyemiczfviqubRDwHwfo242_TT-uVPGaobbYfZsAJd2nEvFPw6bAN3AwwTMpbkT8miBvCopOYd8IxiWffe7vOeNxCJARS-HJYgCl-UvjdPB8HAiD2eWJ6guwMYF3TdG1CPTTyOw_8GSCjdcMann9dkoadnBTvkUDr-nIeJpiLwmkJYsJwmCYLfTzFil2U7bieGYpQ9FtsuSUHDZH8JG9uOFzu41w3Rl1AoOXKIkQdBjknjDlHENYQU05oa9wz5xlrPBchJDWHmWU99yxIq0BLhS70I-s4xQkZae5WxpOT_5-902c-TbzH2bqK5p9jGbcVzTzLNZzKMkxxWGOLlcXE4GvRFLLy5xkmYwn6_GG0XZHZPel20viRtpbPzUcrs27b1tbYCK2a1T47QEu5RwyTk2Qj1xcakALrgUaVJ9nMtLInMWa5fYnvPLWmv85EqOeDNnbq1-viH-dGnmjpjHPFowZ0VOPs58o9pO9ZI6vv_L7V719p6ojvlqzHvNfHssuTavjrtumh9Y9OxeqAuvCyNhTxE_32JMKcs-rsix5UbRpzdj4qJsBrAem9hnQyAr8MfYTEUBcxd9JndCVVjcMiL80D7dP8b8q6PdHTu6kv3fmuwDY0-SxJOkQhEp4r-S5FdFe8Ge3TtSP-K_ZTWXfKT8HoHG9iGkLx4DIx-PcOoTjghL079H-D-K6MDDI5otiNIk-ss0fp7o6_QuS8Eh9Cjki-DM8o8H53fVfWGPbAI8JzK2HB2x6rC2rlorgWfpZZHokHkVRlKWuKyGqgVLJZ9a1RsgcctMN1T3pQfQ5Q-lP7edGJvHUvVtmHda9d3wSF6CEdZNzwVl-jy60kdXVDgv5rrdYPLAJN0oafqW6b-H42KenwDOPY-8GiRlZZXQZM7gq3tEXN9_X6wmrMWLVfS4gXExtBMYD220iIYC4eJMnK7ny-KBkd6yqcmBu6iiAwQPo7eSJ1FNkrqcY9xq91Ak6RmQF4c3ju7Bi314OS0JA4tyyQ34WRqLJWHnVXydz4WX0gmhR8FbShNEqzTxKExgn5k8KoJfAn_B9MJrxYTMg-4tirBiNXRlHol2LXZ3F-cr9T1elOcb4LehDXhUnF6awYjPI5AtCGQlxuAo-Cb6PmSB-SZni4X4wcgpE59hk_nLt7MxbRx45RnV_PGVRIz8BaymJYnKQZKZ3Xqqm3Z6UHW4Os64cUMqiNcEC1Fh8rCrpf-ENI49xc0m2qi2xZIuJ-9Z7xk79VOdGx07Dc5tAjsMg2tPN-x25HCIovFLhQ0nOzN0n1T0OruGndWYW3O8vDCHhXDzQOnZdddl_Zy-1_Mt6GHjNxe4rSgOUP4s1XjQ4Lr-oqrz_iiW20c5TmauOLdJNF751st7XDPx5Mn5tusuWh2NWL2YLxfBhRH0TgD-64JjUca9FgWLbdoao5imrwo3eA2_WBOPanqpe3Gj6-A92r-v69orYWbcLhRKI-F5KC22f2uMWEw_qsgvqjKvy_GLqr5w4-90vJWOTxHQYe6cP2zjvl_BKUz-bR1ZTD0d0UJHTLNXI-t29tkrDc7UBK_p__-o4yWT2SiMp1y8WMBJWkxbb8ca5Ih8SCLrF1uIry3PF6w6HCYPtFfxQcyyPI2Ag3u5UUej3qiL_X0EYRGD3U7wyuVarO1uBuG9-_IJ9PdJ4hcVVVIwMNq_pKbO7Gnc0xE509ql_PV0sl5PtTwgU3yOh8XgJ7d7wA7cjid0UTzs8veGgfARWAUMY4DPyuxy8QbD_Bx_M4z0yLSZEtu5Vx5mMI9dQVSs4Aq6gT92Lr1quAU1qvKS0ZJkpEiLBGVVlGIY50kEY1yVMKrSCrH62TXjsb6TZvJpLx-k-ilnvh37DQdQoFWUCde7U4YfxkvDg4UQjN5y_c8Oo99Qc8_IAzgaBCeD8Xp5eq9opYRdKd0EaPtngLbm6x-qvtszMrd3Ra9jWsYlvmLXUVbmqMyyGF7tr_OqILCqGa2TEqU1xlGJ6zItIgjLLKb1Fb9GEMURjJIojfIIrmiNaZZUMC-zDMEsDRLIWszFyjnH4bgaXhe4zkqYJlcCV0yY4f0ahKbARUF6e6WvB2dWfWOCBApurHm2YLkV7PoUzv_ySxNXvRbXf_-liIHo_wUAAP__xFMZ4Q">