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      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [AMDGPU][MC][CODEGEN] Incorrect definition of GATHER4 opcodes"
   href="https://bugs.llvm.org/show_bug.cgi?id=36252">36252</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[AMDGPU][MC][CODEGEN] Incorrect definition of GATHER4 opcodes
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Backend: AMDGPU
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>dpreobrazhensky@luxoft.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Currently GATHER4 opcodes are defined in a way similar to other non-atomic MIMG
opcodes. Dst size depends on how many bits are set in DMask which can have any
4-bit value.

However, GATHER4 opcodes have a few differences from other MIMG instructions:
- DMask must have only one bit set to 1;
- Dst size is fixed:
  - for SI, CI and gfx8.0, dst size is 4 dwords.
  - for gfx8.1 and gfx9, dst size is 4 or 2 dwords depending on d16.

This difference affects:
- MC layer
- Codegen</pre>
        </div>
      </p>


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