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<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>
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<th>Summary</th>
<td>[AMDGPU][MC][GFX9] Incorrect handling of v_cndmask_b32_sdwa with src0=vcc_lo
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AMDGPU
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>dpreobrazhensky@luxoft.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
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<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>
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