<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/153008>153008</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [RISCV] Assert fail on loop-vectorize pass
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          amitch1999
      </td>
    </tr>
</table>

<pre>
    Hi, 

Compiling a test taken from gcc (`/gcc/gcc/testsuite/gcc.c-torture/compile/pr39943.c`) :
```
void gl_fog_index_pixels(float f, unsigned int n, unsigned int index[])
{ 
 unsigned int i;
  for (i=0; i<n; i++) 
    index[i] = (unsigned int) ((float) index[i] + (1.0F-f));
}
```

Compilation command:
`clang ./pr39943.c -march=rv64imfdc_zve64x -mabi=lp64d -c -O2`

Crashes on an assert:
```
/llvm-project/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp:1323: 
llvm::InstructionCost llvm::RISCVTTIImpl::getCastInstrCost(unsigned int, 
 llvm::Type*,
 llvm::Type*, 
 llvm::TargetTransformInfo::CastContextHint,
 llvm::TargetTransformInfo::TargetCostKind,
 const llvm::Instruction*): 
Assertion `(SrcLT.first == 1) && (DstLT.first == 1) && "Illegal type"' failed.
```

I tried this on the current HEAD (`ccd35e5b2f1438646d11c27eaa475f34681f9cbe`)
And on 20.1.8 (`87f0227cb60147a26a1eeb4fb06e3b505e9c7261`)
The same happens on both.
</pre>
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