<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/66370>66370</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Bug][AArch64] Ensure SVE operand passed via memory are initialised.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          paulwalker-arm
      </td>
    </tr>
</table>

<pre>
    Taking the example below it can be seen that `j` is not initialised by `main` when calling `F9`, which means `F9` reads uninitialised stack space.

```
#include <arm_sve.h>
#include <assert.h>

__attribute((noinline)) void F9(double a, double b, double c, double d,
                                double e, double f, double g, double h,
                                double i, svfloat32_t j) {
 assert(!svptest_any(svptrue_b32(),
 svcmpne_f32(svptrue_b32(), j, svdup_f32(2.0f))));
}

int main() {
  svfloat32_t j = svdup_f32(2.0f);
  F9(0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, j);
  return 0;
}
```

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJycVN2OqzgMfhpzYw1KEwjlgot2On2BXe1tFcCUdEJA-Wm3b7-ConMYqdJqF0WJw2d_thPHynt9tUQV5EfIT4mKoR9dNaloHsp8k_tQbkjqsX1Wf6pvba8YekL6Ww2TIazJjA_UARtlsSb0RBZDrwKCZDeQDLVHOwbUVgetjPbUYv2c0UFpOys8erLYKGNmbpDsXIJkwD_x0eumx4GU9b_-oyPVeox2y-eDar7RT6qhFNgJ2GGdJVvHa8uFto2JLSGIT-WGi79T2oP4eot7Ty5s4WW-XFQITtcxEPA98L0dtTXaEvASeIn3Ubd4LoHv2zHWhlDNqaxyvZGbjdwC_3zR4798qwFtjLuNfN3I_X8l1bOxv3dmVEHwS8DbnBAUx5XldSJL1jt_nwL5cFH2CXw_71ykSy34Ape_Xft7M0yWLt0CvVOc3cx-2zitWjxl3es41yHWEKA4be9C24BLFS1Um0h_ZoEgTm_5xS_95cJYupTd_11uPykdhegssjfB_yzLpK1EW4pSJVTtZJnJUspCJH1V7LjcUZNz6qhrpcwyyhrKi64tMyYlT3TFGRes3GU7wTIh0oJLLlqpmn3OiqzsIGM0KG1SY-5DOrpror2PVEkpCpYYVZPxy7vn3NIDFxA4n9uAq2abjzpePWTMaB_8b5agg1kaxjFeIT9BfjwcXNPLDPITflkfHeEff33hOJFTtsVpLp0W71rhQMPonqgcbVtCmkRnqj6EyYM4AD8DP1916GOdNuMA_Dy7XpePyY03agLw8xKwB35eEvonAAD___iiXtc">