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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AMDGPU][MC][GFX10] Incorrect FLAT GLOBAL fcmpswap data size"
href="https://bugs.llvm.org/show_bug.cgi?id=51715">51715</a>
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<th>Summary</th>
<td>[AMDGPU][MC][GFX10] Incorrect FLAT GLOBAL fcmpswap data size
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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
</td>
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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>d-pre@mail.ru
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>global_atomic_fcmpswap and global_atomic_fcmpswap_x2 are similar to cmpswap
opcodes but operate with f32 data. They have 2-element data operand:
- global_atomic_fcmpswap: data operand type is f32x2
- global_atomic_fcmpswap: data operand type is f64x2
However llvm assembler expects one-element data operand.
An example of a failed test:
global_atomic_fcmpswap v[1:2], v[2:3], off
The assembler expects that data operand size is 32 bits which is incorrect:
global_atomic_fcmpswap v[1:2], v2, off // invalid opcode but assembled ok
Compare this with cmpswap test which is accepted by the assembler:
global_atomic_cmpswap v[1:2], v[2:3], off</pre>
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