<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/139381>139381</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [x86]: 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 x86.

```
; Function Attrs: mustprogress nofree nosync nounwind nonlazybind readnone uwtable willreturn
define fp128 @call_maximum_fp128_x86(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: 0x3ade0080: i8 = setcc 0x3addc768, Constant:i128<0>, seteq:ch
  0x3addc768: i128 = bitcast 0x3addbe08
    0x3addbe08: f128,ch = CopyFromReg 0x3ad783c0, Register:f128 %1
      0x3addbd90: f128 = Register %1
  0x3addfdb0: i128 = Constant<0>
In function: call_maximum_fp128_x86
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 'X86 DAG->DAG Instruction Selection' on function '@call_maximum_fp128_x86'
 #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 0x00007e645a842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x00007e645a8969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #4 0x00007e645a842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #5 0x00007e645a8287f3 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 0x0000000001f70c6a (anonymous namespace)::X86DAGToDAGISel::Select(llvm::SDNode*) X86ISelDAGToDAG.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 0x00007e645a829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#22 0x00007e645a829e40 __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/z3arKMfjo
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzEmFuT2ygWgH8NfqHsQuj-4Ae13e7t2mQn1c5MZZ9cCCGZCQINoLQ9v34LJLdsx9mk09naLrva4nLOdy4cEMQY3kjGliC-A_F6Rnq7V3r5u25IPytVdVw-Apy20DDGZQOJhExrpeHznklo9dE1WgV7w6AQX9pFyyVv-3ZRBziDRFZjKzlMrUrCQ5YsACrcJ0HjBxUgvIObXlLLlYSFtdqAsIBtb2ynVaOZMVCqWjMGpTJHSaFUvXzmsoJSSUH-Ppbut2akkkoy2D9bUgoGn7kQmtleS4CKitVcMlh3jgREiBIhdiPezrfuDlkCcDaOwPEB4BV8eToCnMNeStKyakeqSkOAQwRBegdQYSzRFoTOLugGIwjCNbSEC-j0TFq_csp3FAIcYi9UMzt1eZ-l69GRP-28F4eZjtFekJteo4Jo9gMGvLADnF-H9_Lx3bs_3sP7p6ffnhzoikipLDRMMOpcCNEhJBVDKEPuiWfelYZZSoeuiqaJ17ZS0lgi3STu9IYrBMJ712OYZX-BsKB777uzaU6ityRcw5JbSowdu0uGMj8anjeEBRyMXNG9n7RS3XGjVfvEmmFcmoUUOaVPrOHGMg3Coh7jFIwCX0RWOTqJ9NJOc6bBw8C6KtEF62TrYCQqHiWsx6i7kd9IZ1R8eHdfbO-h6cuWW0hg2TdQs05p65bv3trO5QvAG4A3Dbf7vlxQ1QK8cZEe_807rf504cEbbkzPDMAbv8a5pKKvGLR7BqkmZg9LQj9bTShzy3xrCf0Mq77thrWBFgDlH1xWkhYS3fQtk9anK8Ab1Tn5VLUdF0zP2aETSjPt2gSRzdzqXn4GeFNy6bEonCs3j3Sdm93brrcLA-eHLJkT087NUVpyAOGaS8sEBOHKqF5TNrgvcChPvZSujnXEGAhw-rKMPriG90SSxgGkrnK1quoFc6MuJOHUGYpvSfuUJXBdPMxBeL8uHuCjNFb3g_ytz3YXukH4KZJe_LdrU-pSxJcddECnv7CM8jjKfL11bg4LczTDjw-aS-uD8NGFBOBsGqTJ804ZqxlpAU5cAnNph5KT_Uw0AL5Dh5FlKAGONLgiTQMUwS1vJBH_ILISTmLmFa-g4Q2XtdpZgAv3_EXxyv_MxxlmQTuXSch_BwV4VJCyJIpJFuEYo9EEwUuAN4cs2SXRXHDZH-aN7IcOujBqkXhmP2UiDi8F5kleU9jZvSuWu89ciNdJ9_Mn6dE1bpQmsDHevNdiR2kyCY4vBeMsrUNISrfMXyXWT5zEJufxQ2kWxTk-y7TfJf-rZ1uruWy25Isvfi4ByZfLZPv47PZe6oqYTzafZQuqROWjO82_EeH0IoWyGmXZebK_LKV18fC4ZWJoHXaVfzM7dF_AbNf_UhUbM-tN2T7ATN7KrlCTss6_izq0rlTFVqptXUm4zbqCvfRHtgrSPdEnb172_Io1PHBPVuXnVgV1imhCnAYilTy2qjfQHYpM5ytMPnB_ypJ18fBR3bD027H4lCVu8GniVS64anJZ-DJWVWn0XQev1VnpPau82ds95QHGAw8Og-Aq_jTL8PdTVVXsgclCVvctt-vi4ZeQed0TGb4iq4Oa_GBmFkLcEcPpnVD0s7mI3st-ebWy38LtyCbu8II7RwGqku9y617-Jt8TuueSnRAvuL_qezv4gDaBR9eZmtXBfwF_xxpCj_8__AFwwo_P8XFZRiQ9L7pXBO64dMZ-E_pr2kVHtF24rRfekHdj9V9sRmEQxiE-X16bD27e6dT2apyfd95AMjkvveaMy-AHON_7E-ZlpMemX8IYl2cBzq4Ykzo436rEWT6e0T623bTG_mekjmUivdh-UFYyGtZwlPriMrcj-l3Eb4cTlnvXXClp2eFUnoSgX6cWRpfnnDxPUwZbwuWbbBnkvJiCg6tDWl7lrzys-imTQHwtkEUI7nZuzs7fSezObPhhFSw6UxFeuT9JUQwH4W_yzSBp0HN6JbRMt1wSyyr4zO0eDudi9364fXzY3j_8AVCxGvXA4Y6CVa47CG_cOVy926qqVMIulG4A3vztviHR_3xf_6lm1TKs8jAnM7YM0ijJsjzO8Gy_RCxLUhbgitUJCVBQsTzDSRoENSpLmgUzvsQIxygOUBCjBKNFXpM4RSSKq5zULKYgQqwlXCz8vYnSzcy_QC-DMA-zYCZIyYTxV3AYS_YMfS_AGMTrmV76d--ybwyIkODGmkmM5Vb4uzv3Yhivb96kgATR23ckCYK10m7A1_c5CZr1Wix__mZgtO3LEv8nAAD__xWmIu8">