<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/56165>56165</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Backend error when compiling x86 AMX-INT8 code with -Od
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

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

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

<pre>
    Reproduced @ OS Windows 11, clang 14.0.5 (the binary from https://github.com/llvm/llvm-project/releases/tag/llvmorg-14.0.5).
$ clang.exe  -c -Od -mamx-tile -mamx-int8 amx_test2.c 
>> 3.      Running pass 'Function Pass Manager' on module 'C:\work\gb\amx_test2.c'.                                                                                                                                                                                                                                           >> 4.      Running pass 'Fast Tile Register Configure' on function '@do_tmul'              

With /O2 it compiles successfully.
The code is as small as:

#include <immintrin.h>
void do_tmul(int* C)
{ 
    __tile1024i c_tile = {16, 16};
    __tile_zero(&c_tile);
    __tile_dpbssd(&c_tile, c_tile, c_tile);
}
     
[amx_test.zip](https://github.com/llvm/llvm-project/files/8961068/amx_test.zip)


</pre>
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