<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/146213>146213</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [llvm] [M68k] CallSeq assertion failure in SelectionDAG
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            bug,
            backend:m68k,
            llvm
      </td>
    </tr>

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

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

<pre>
    ```ll
; RUN: llc < %s -mtriple=m68k-linux | FileCheck %s

define double @minimized() {
start:
  %_58 = call double null(double 0.000000e+00)
 %_60 = load double, ptr null, align 8
  %_57 = fmul double 0.000000e+00, %_60
  store double %_57, ptr null, align 8
  ret double 0.000000e+00
}
```

fails with `.../bin/FileCheck .../llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp:510: llvm::SDNode* FindCallSeqStart(llvm::SDNode*, unsigned int&, unsigned int&, const llvm::TargetInstrInfo*): Assertion 'Best' failed.`

Something appears to be wrong with the `callseq_start/end` ordering with these instructions, but not yet sure what the exact problem is


</pre>
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