<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/91848>91848</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Compiling Error][LiveIntervals.cpp] error: invalid use of incomplete type ‘const class llvm::TargetInstrInfo’
        </td>
    </tr>

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

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

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

<pre>
    

When I invoke function in TII like:
**bool test = TII->isTriviallyReMaterializable(MI);** (An example, no significance)
```
diff --git a/llvm/lib/CodeGen/LiveIntervals.cpp b/llvm/lib/CodeGen/LiveIntervals.cpp
index 68fff9bc221d..fd53728b54fa 100644
--- a/llvm/lib/CodeGen/LiveIntervals.cpp
+++ b/llvm/lib/CodeGen/LiveIntervals.cpp
@@ -517,6 +517,7 @@ bool LiveIntervals::computeDeadValues(LiveInterval &LI,
       if ((I == LI.begin() || std::prev(I)->end < Def) && !VNI->isPHIDef()) {
         MachineInstr *MI = getInstructionFromIndex(Def);
         MI->setRegisterDefReadUndef(VReg);
+        bool test = TII->isTriviallyReMaterializable(MI);
       }
     }
```


it results in compiling error below:


**Solution:**
include
`#include "llvm/CodeGen/TargetInstrInfo.h"`
in
`llvm/include/llvm/CodeGen/LiveIntervals.h`
</pre>
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