<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/149585>149585</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [AArch64] Bad machine code: Using a killed virtual register
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            backend:AArch64,
            new issue
      </td>
    </tr>

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

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

<pre>
    A build with expensive checks enabled, and this input:

```
#include <algorithm>
int a;
void c(bool b[][9]) {
  for (long d((char)62021 - 7); d; d += 2ULL)
    a -= std::max(b[d][d], b[1][1]);
}
```

runs in to this error when compiled with `clang++ -Ofast -mcpu=grace test.cpp`:

```
*** Bad machine code: Using a killed virtual register ***
- function:    _Z1cPA9_b
- basic block: %bb.1 vector.body (0xaaaab373d9d0)
- instruction: %41:gpr64all = COPY %82:gpr64sp
- operand 1:   %82:gpr64sp
fatal error: error in backend: Found 1 machine code errors.
```
</pre>
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