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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AMDGPU][MC][GFX10] Incorrect handling of FLAT instructions with saddr=null"
href="https://bugs.llvm.org/show_bug.cgi?id=49164">49164</a>
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<th>Summary</th>
<td>[AMDGPU][MC][GFX10] Incorrect handling of FLAT instructions with saddr=null
</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
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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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>FLAT GLOBAL instructions with saddr=null are handled incorrectly. 'null' is an
alias for 'off' but it is handled as a regular register and results in an
invalid vaddr size.
Examples:
global_atomic_add v1, v2, null
This is not a valid code but it is assembled ok and results in the same
encoding as the following legal instruction:
global_atomic_add v[1:2], v2, off
There is a similar issue with FLAT SCRATCH instructions. For example, the
following instruction is illegal, but it is accepted by llvm assembler:
scratch_load_ubyte v1, off, null
The produced code is the same as generated for the following legal instruction:
scratch_load_ubyte v1, v0, off</pre>
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