<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/139380>139380</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [aarch64] `Cannot select: constant:i128<0>` for `llvm.maximum.f128`
        </td>
    </tr>

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

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

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

<pre>
    I'm seeing an error when trying to use `llvm.minimum.f128` and `llvm.maximum.f128` on aarch64.

```llvm
define fp128 @call_maximum_fp128(fp128 %x, fp128 %y) unnamed_addr #0 {
start:
  %0 = tail call fp128 @llvm.maximum.f128(fp128 %x, fp128 %y) #2
  ret fp128 %0
}

; Function Attrs: mustprogress nofree nosync nounwind readnone speculatable willreturn
declare fp128 @llvm.maximum.f128(fp128, fp128)
```

```
LLVM ERROR: Cannot select: 0x10c8bea0: i32 = setcc 0x10c888c0, Constant:i128<0>, seteq:ch
  0x10c888c0: i128 = bitcast 0x10c87fd8
    0x10c87fd8: f128,ch = CopyFromReg 0x10c105c0, Register:f128 %1
      0x10c87f60: f128 = Register %1
  0x10c8bbd0: i128 = Constant<0>
In function: call_maximum_fp128
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: /opt/compiler-explorer/clang-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel <source>
1.      Running pass 'Function Pass Manager' on module '<source>'.
2.      Running pass 'AArch64 Instruction Selection' on function '@call_maximum_fp128'
 #0 0x0000000003b49548 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3b49548)
 #1 0x0000000003b47104 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #2 0x000073d283c42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x000073d283c969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #4 0x000073d283c42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #5 0x000073d283c287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #6 0x0000000000784592 llvm::UniqueStringSaver::save(llvm::Twine const&) (.cold) StringSaver.cpp:0:0
 #7 0x00000000038f0888 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38f0888)
 #8 0x00000000038f6bf9 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38f6bf9)
 #9 0x0000000000bfa944 (anonymous namespace)::AArch64DAGToDAGISel::Select(llvm::SDNode*) AArch64ISelDAGToDAG.cpp:0:0
#10 0x00000000038edd74 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-trunk/bin/llc+0x38edd74)
#11 0x00000000038fc882 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-trunk/bin/llc+0x38fc882)
#12 0x00000000038ff1fa llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38ff1fa)
#13 0x00000000039010d6 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x39010d6)
#14 0x00000000038ed8f1 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38ed8f1)
#15 0x0000000002bb4a78 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#16 0x0000000003135322 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3135322)
#17 0x00000000031355b1 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x31355b1)
#18 0x0000000003136f19 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3136f19)
#19 0x00000000008bec3f compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#20 0x000000000079977e main (/opt/compiler-explorer/clang-trunk/bin/llc+0x79977e)
#21 0x000073d283c29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#22 0x000073d283c29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#23 0x00000000008b6705 _start (/opt/compiler-explorer/clang-trunk/bin/llc+0x8b6705)
Program terminated with signal: SIGSEGV
Compiler returned: 139
```
https://godbolt.org/z/YWdK1ecM5
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzEWFtz4ygW_jX4hYoLofuDHxQ7zqa2s5OKe2ZrnlwIkMxGAg2gxNlfvwWSI9vxTHc6vTVd7ooNnO9858qFGCNqyfkCxNcgXs1Ib3dKL37VNelnpWKvizuA0xYazoWsIZGQa600fNlxCa1-dYNWwd5wCBLUNM_tvBVStH07rwKcgQRBItk0R_Ync0pCQjTdJdEcoMJ9EjR83HKACsYrITmsugBnEESIkqbZjihbPwpwNs7ieA_wEr79egU4h72UpOVsSxjTEOAQQZBeA1QYS7QFodMJ3WIEQbiClogGOh2Txve8_1ohwCH2oJrbaQo529LVaGR4Dde9pFYoCQtrtQFhAdve2E6rWnNjoFSV5hxKZV4lhVL18kVIBjUnTCrJoek47RtiSdlw-CKaRnPba-k9Rhui-XcY8MYd4PzY9WeRAKj48uW3e3jz-PjLoyO6JFIqCw1vOHUuhGgfIJqVnCD3S4TY-9JwS-k4l2UUOXVLJY0l0kkJpzhcIhDeuBnDLf8DhAXdeecdiTlIb0q4gqWwlBg7TqcVy_xqeDwQFnCwckl3Xmipute1Vu0jr4d1AYoHOo-8FsZyDcKiGgMVjIATZIIOkB7tIDMtHs0v2SnXydbBSFTcSViNYXcrL-QyKh6-3BSbG2j6shUWElj2NdS8U9q6OttZ27lkAXgN8LoWdteXc6pagNe-YIY_V51W_3GxwWthTM8NwGtfhkLSpmcc2h2HVBOzgyWhT1YTyl39bSyhT5D1bTcUBpoDlD-4lCQtJLruWy6tz1WA16pz-FS1nWi4vuL7rlGaazfWEFlfWd3LJ4DXpZCeFoVXysmRrnPSve16Ozfwap8lV8S0V-ZVWrIH4UpIyxsIwqVRvaZ8cF3gqDz2UrqG0xFjIMDpWw09uIF7IkntCKSurbSK9Q13q06QcOoMxZfQisI3IngnjdX9ALzxOe7iNaAewudxL3ej1OWEbzRojw7_wjLK4yiDPkhhAcLCvJrhy4MW0nrPf3VxADibFmnyslXGak5agBOXsULaoclkPxICgK_RfuQyFL1jGpwxTQMUwY2oJWn-QSRrHGLmFS-hEbWQldpagAv3-1kJ5r_mo4SZ086lD_L_BwV4VJCGDGchjXCM0WhCI0qA1_ss2SbRVSNkv7-qZT9M0LlR88Rz9iIT4_AUME_yisLO7lx73D6JpvkYupef0KNzulGawNp48z5KO0qTCTg-BcZZWoWQlK62PwTrBSfY5Dh-KM2iOMdHmfarFH_0fGO1kPWGPPtu5xKQPJ8m29cXt9NS17V8svksm1PVMB_dSf5ChNOTFMoqlGXHyf5WRqvi9m7Dm2F02Ed-53aYPiGzWf1LMT5m1qeyfSAzeSs7o5qUVf5NqsPoUjG-VG3r2sFlrkvYS3-gYpDuiD5483TmZ9TwwHuyKj_JgbIieRQ5DUQq-dqq3kB3DDKd7zD5wHtseKvi9qu6YO2fx2MUdAIH4bOccF3ltAFmnLE0-qajV-qo_R513-zzHvMExqMODoPgLA9oluFvp6xi_JbLQrKbVthVcftTmHndEzN8xqwKKvKdGVo0zTUxgl43ij6Zkwi-bZZnFf4Z3o7ZxDs84Z2jALHkm7x1L3-R94TuhOQHiie83819nvhAbSIenWdqVgV_QfwLrwl9_fvoDwQn-vExfVyWEUmPm-8ZA3dWOuJ-kfR7tvOOaDt3WzC8gHeh-k82pTAI4xAfl9f6wckdjmwfpvPjzhuYTM5Lz3nGZfAdPO_98fI00uPQT-EYl0cBzs44JlVwvGU1R_l4xPau7aYa-78xdVwmpqfbUFZyGlZwRH1zmdsZ_U7it8WJlrtlLpW0fH9oT01D36cWRqfnnTxPUw5bIuSnbBlw3kzBwdlhLWf5Bw-tXmQCxOeAPEJwu3UyW_8asT2y4btV8OhIRXjm_iRFMRzAP-WbAWnQc7gPWq5bIYnlDL4Iu4PD-dhdDjd3t5ub298AKpajHji8TnDmpoPw_LXh7FarWKkaO1e6Bnj9X4DXv_-b_TPg9D6esUXI8jAnM74I0ijJsizPstluETFc0iioSkZYEkQpyyKGk4yTtIyqKK5mYoERjlEcoCCKE5zNEcsQC-ISJWUQRwSBCPGWiGbun0uUrmf-6rwIwjzM0KwhJW-MfyXDWPIX6GcBxiBezfTC37rLvjYgQo0w1kwwVtjGP6-ND10gXkGQoHePKPTy00iCYKX0nz2gzXrdLH78UWA07nmB_xcAAP__8pT9rQ">