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      <base href="https://bugs.llvm.org/">
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    <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][GFX9] Incorrect handling of v_cndmask_b32_sdwa with src0=vcc_lo"
   href="https://bugs.llvm.org/show_bug.cgi?id=43607">43607</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[AMDGPU][MC][GFX9] Incorrect handling of v_cndmask_b32_sdwa with src0=vcc_lo
          </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>An example of a failed test:

    v_cndmask_b32_sdwa v5, vcc_lo, v2, vcc dst_sel:DWORD
dst_unused:UNUSED_PRESERVE src0_sel:DWORD src1_sel:DWORD

This code violates constant bus restrictions because it uses 2 scalar registers
with a partial intersection. However assembler does not detect this violation
and instead produces the following (invalid) code:

    v_cndmask_b32_sdwa v5, v2, vcc, vcc  dst_sel:DWORD
dst_unused:UNUSED_PRESERVE src0_sel:DWORD src1_sel:DWORD

This may look like a minor issue but it affects GFX10 where the provided
example should trigger no errors.</pre>
        </div>
      </p>


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