<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/107704>107704</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Clang] Assertion `E->getOpcode() == BO_Assign && "unexpected binary l-value"' failed.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          yijan4845
      </td>
    </tr>
</table>

<pre>
    Compiler Explorer: [https://godbolt.org/z/ccxeE7exq](https://godbolt.org/z/ccxeE7exq)

Attempting to compile the following program with Clang Assertion Trunk:
```c
typedef union {
  _Complex float cf;
  long long ll;
} ucf ;

void foo () {
  ucf ucf1;
  _Complex float cf;
  __asm ("" : "=r" (ucf1.ll) : "r" ((cf + 0)));
}
```

Stack dump:

```
clang-20: /root/llvm-project/clang/lib/CodeGen/CGExpr.cpp:5714: clang::CodeGen::LValue clang::CodeGen::CodeGenFunction::EmitBinaryOperatorLValue(const clang::BinaryOperator*): Assertion `E->getOpcode() == BO_Assign && "unexpected binary l-value"' 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-20240907/bin/clang-20 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -dumpdir /app/output.s- -disable-free -clear-ast-before-backend -main-file-name example.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -fno-verbose-asm -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debug-info-kind=constructor -dwarf-version=4 -debugger-tuning=gdb -fdebug-compilation-dir=/app -fcoverage-compilation-dir=/app -resource-dir /opt/compiler-explorer/clang-assertions-trunk-20240907/lib/clang/20 -internal-isystem /opt/compiler-explorer/clang-assertions-trunk-20240907/lib/clang/20/include -internal-isystem /usr/local/include -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/15.0.0/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -vectorize-loops -vectorize-slp -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/example-17b744.o -x c <source>
1.      <eof> parser at end of file
2.      <source>:6:6: LLVM IR generation of declaration 'foo'
3.      <source>:6:6: Generating code for declaration 'foo'
 #0 0x0000000003b24fa8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3b24fa8)
 #1 0x0000000003b226ec SignalHandler(int) Signals.cpp:0:0
 #2 0x000077a810a42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x000077a810a969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #4 0x000077a810a42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #5 0x000077a810a287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #6 0x000077a810a2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #7 0x000077a810a39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #8 0x00000000042f7572 clang::CodeGen::CodeGenFunction::EmitBinaryOperatorLValue(clang::BinaryOperator const*) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x42f7572)
 #9 0x00000000042e43b0 clang::CodeGen::CodeGenFunction::EmitLValueHelper(clang::Expr const*, clang::CodeGen::KnownNonNull_t) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x42e43b0)
#10 0x00000000042e4721 clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr const*, clang::CodeGen::KnownNonNull_t) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x42e4721)
#11 0x0000000003e7a443 clang::CodeGen::CodeGenFunction::EmitAsmInput(clang::TargetInfo::ConstraintInfo const&, clang::Expr const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3e7a443)
#12 0x0000000003e7ffec clang::CodeGen::CodeGenFunction::EmitAsmStmt(clang::AsmStmt const&) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3e7ffec)
#13 0x0000000003e860d0 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3e860d0)
#14 0x0000000003e8db44 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3e8db44)
#15 0x0000000003ef5764 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3ef5764)
#16 0x0000000003f07f7f clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3f07f7f)
#17 0x0000000003f6c09a clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3f6c09a)
#18 0x0000000003f66f15 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3f66f15)
#19 0x0000000003f674cb clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x3f674cb)
#20 0x0000000003f71603 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#21 0x0000000004471816 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#22 0x0000000004461a38 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x4461a38)
#23 0x00000000065ae1c4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x65ae1c4)
#24 0x000000000446f378 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x446f378)
#25 0x00000000047012b9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x47012b9)
#26 0x0000000004684b6e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x4684b6e)
#27 0x00000000047ea6de clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0x47ea6de)
#28 0x0000000000cb8fdf cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0xcb8fdf)
#29 0x0000000000cb222a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#30 0x0000000000cb5b5e clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0xcb5b5e)
#31 0x0000000000b88c84 main (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0xb88c84)
#32 0x000077a810a29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#33 0x000077a810a29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#34 0x0000000000cb1cde _start (/opt/compiler-explorer/clang-assertions-trunk-20240907/bin/clang-20+0xcb1cde)
clang: error: unable to execute command: Aborted (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see invocation)

```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzMWl1z46i2_TXKC4VLQrJkP-TBseOerttzumvS1efRhdCWwgSBLqC0c379LUBOjPMxndzxqemK3RaCzVqLzWYjQY3hnQS4TOZXyXxzQUd7q_TlA_-TymJRzC9q1TxcrlU_cAEaXe8HoTToJF-hZH51a-1gknyVkG1Ctp1qaiXsTOkuIdv_JGTL2B6uK9j_bzLfJGTx69XJMkk3SboK3ytroR8slx2yCrEABtlbQK0SQv10NwatOk179JPbW7QWVHZoZQxoy5VE3_Uo71zHwWiZhj8Wru3DAA20aJSublJdhWKEdo63gD1qhaIWsTbJH-8JJbvpSzwWJ9UGjaxFTwX--17xBrVKoYQsErI87sLVHlmbHVl-q9fdjpo-mCEJIciPAyFJvtH-kiycsZkQvptw83AnIQsHjVyh1Okb_o6Qn4hzTODGUnaHmrEfnkR8qTZzumOShp63WimbkK0Q9z0etPoTmLv0lVwxrxOyXasGPoF0vz5d7wc9Y4PrZF5lhbMSKuerJF8davqLLz-oGOHV29PFdpTMOUAovO65veKS6oevA2hqlQ5WnDBKGntsLa6XkJUXa3XkU0mZXuMkv-7Afh2YauAwuPkmyTfo6utu5ecWSkiZkNKNxChhPwCz0KDa20cC3wcEJCEVaikX0MyClt--XK9urpEZ655bRFE9dkjDoLR1k-BkKnF7O9YzpvpJ7ueqc2NGMAnZIiobxCUTYxPmENPU3KKasjurKYOErNGgYdCKgTHQIKNGHYpdS2qMYpw6DnqUyDDNBzt71U3SWZIuv01zk-pu7EFaM_mHGrw_TMEFwyG4TD6C6UFsg62bwZikpEiXaZWQbc3lYz2SIsxYhrDVfBCA9otyVxZ4lHdS_ZRYcDnucSdHhKHnFqv6T4QdyoZrB4MOgwMz2mG0M4MRbrihtQDcagCEmQCqMTUW19AqDdhJBbJBuKdc4pYLwJL2gGBP3cSdMYR7DUIx6rDjXjUg0MAZwgNnWMA9CETCBTd44IBw32raAx4Ul9ZF141UEhBue2pvMWgtFcJtO2CmpBskm-QbJRFupcJajbLhssOubii6B10rA9jFCtx739Yjs0pjKjg1YBBuR_mTywZbR9Qk-YYgbKnuwGI2jE5BXBYI21GCL-hAgnYUGqjHDnPZKnzHZZPkmyP7CDc_qW4dAOOn3aaYWnSgnTHu5tema2qE22ApjH5QquGOehgRhFum7kHTDt6ooyF4J56G8v_jUSEeHaKT8yk_GJIKzM2DsdD_3T24aTlNxBf7Go2z6xxJ_FXV12F1jGEj6WBuQzD2GDrGErKd5snj_EjINpvP0pkDNps9_3qh_nNQsHc_2HMeU9UX7Lzd-v1dIPw1R7gFrZXGgrv4mS0Rbjs5smPfnJFZhnBr7viAVaMxuwV2h7nEXd96_xNK44bTTipjOTMI34Nzc_4fwEKpISowwvksbRpteIfwZrf7tF7vflv9uN5t_r36Y0t26-3n3erm9yTfZAi7ZGBrexd5priBs6quimKmEN4jhpJ8PUXe_DrE0szF0iRfg2qT_BoNVBvQiFrkgpFqkYtEoSaZaj4ZyFfl9EFfvvz4HX3-I0xpP6lc4waYoNNlQqpWqYRUwVr-lrVPkxXZIbcIolbpt2yhhOQpSvfp4V9ek6KlC-RXLb_0mgcTfnzTXFq_pnwPC9PiqZKmP3fKWA209-vrGnFp_fLrVuG_cWVJyFW6n0A-pqWORXbCgpTA0A3vJBW_UdkI19tiAhWKzZTbpP7zaIhMhqqKLrKUFmRO0olGmKwvTDvBazYzalZ6eL5JBC6PbS7LZcvQYG810GZ3x4V4Xwe-fdRBcQq6qErUGc_zveCLqoxsz2PbZFG1OaK1y3zeZdk3jCyXzyxn9bttZnVks4pt5ktYlu-z6ZtENhfHvlWQtppX5O_LdV_LcpFfyUOue555NFGJuC5jrlDkdfp-roHdbyAGP--O2rtNxRGz9au2_8cli_9S8l-jELvzxZKJ4tMWl-RZeqpBRbKPavDPZ1-RLGIfR1KoaFHk72e_Mv1nOYw25v_d57SfZasOzV2ySrn0ZQdlyhNlnqlmbBPu7HZsv8-ycFFTw9nOWO3T2jW7pTqq7Ap2rje34wm38-uoBhV-m6D00X1XpTzfUhb0jQaAnAxA2wL70ADc2P5E_6nwSOjz8XKwI155zGtRps0HQstzUseMvHs85SUrrenDH9C68TxSwdojf3IDfDYVPMlIheJEhaYuiversFb94Haajvu_ub1Vo71hajgJN8e1oslVKyXeCj-rrvPR60aoM6ZxgXykzjxWp51X5QfUOZRcqebhTV85GzMPPGJWRszatGqr9n3Mptwe1uHp1lHbT0LVVGyAidj9H9u_vdisPx0qnkThc8kT2EfyVLE8JUuX9K_k-V01o4CnYQ8yHLhsoOWSB_q_IlYonxbtM_pG4BaRX5yQL9ts_jHy_1zSjlNEenlCuipY_THSr1M9Hx2H9pgOibfRbZWV6V-mTad0vqvhC9zDBP6YVCg5DNBsoNrO3LqCIkvPd7QOWZTQFUWVLTK_JaJSyYdejQZJ2oMZ_KZ-GQEMO5HP_SBCcdhKvw3zk1bj4NZcskQB1tXIRQP6ZXQkRldmNF9Ej_7D412XKY69f9X1ARznSZ4D2MgLohynnFPIWLR-faPawOrm-8mqBD09WZnD_2dCPgGLkBcn49Dm1eIF_10dL7V7YKOFqWh633ImpR2cCG-UKRRVmpF6eYx3q5W0IJsXAJ8VakASQY2W_qJcFHV58q4sdP5ZGkslg5fVfZ3bGZfqCW1Ep4qVB1o2EG_XPPAnVvfTu5fnyWnE-pxPOgLKiEa06KasXrRNixjLdj11BhYv7yJu6cnWYY3iMrJG94o352QTsEZklidkCCEUHQZinX330eSI0k1Phfjhn5aH6P4CszJOFZyNtfO7fbx_bDS_fyW4x8-WU1bP6_nkKgeV_SPZoKGXbPVrnZ5JV4fvWNf4sXJaLxZsUSAH_TwIQgcRgpPn0WTZLN_5PNo3iWzmpzahSNFu55rtjKXa7o4o_nIvUMS9FCeDn7EGULB_rvFzXTxiOMQa5N88uR-jpLUAZBWCMDUQU31PZePPEtRKW2iQP3-gwb84h-YNa74EtVMsPpiajg2gZvQdPT2DHw0gfO_LABA_iorLF89wXDSXebPMl_QCLrOKzCsyL0l1cXsJbbsoGtI20LA6b-iyqOdzmi-Luq2XNKsv-OVBp6zM8qKaAUvni3mT06ydL0gGSZFCT7mYuYk2U7q78OcRLrO0qtLiQtAahPFnkAiZ3o-SZL650Jf-GEM9diYpUsGNNU8mLLfCH1zyx32S-ea_cjrjYtTi8uPHLybG95fk_wIAAP__n657Mw">