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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [mc] SOP2 u64/i64/u64 instructions -- source operands do not support floating inline constants"
href="https://llvm.org/bugs/show_bug.cgi?id=28163">28163</a>
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<th>Summary</th>
<td>[mc] SOP2 u64/i64/u64 instructions -- source operands do not support floating inline constants
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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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
</td>
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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
</td>
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<th>Component</th>
<td>Backend: AMDGPU
</td>
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<th>Assignee</th>
<td>artem.tamazov@amd.com
</td>
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<th>Reporter</th>
<td>artem.tamazov@amd.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, nikolay.haustov@amd.com
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16564" name="attach_16564" title="Failing lit1 tests">attachment 16564</a> <a href="attachment.cgi?id=16564&action=edit" title="Failing lit1 tests">[details]</a></span>
Failing lit1 tests
Example of failing instruction:
<span class="quote">> s_mov_b64 s[0:1], 0.5</span >
In the case above, 0.5 is encoded as 32-bit literal F32 constant (0x3f000000),
which is incorrect. Correct encoding is inline constant.
When a FP literal is encountered as a 64-bit src operand, relevant double
number is used by the SP (ALU of AMDGPU), regardless of the operand type. If an
operand is not F64, then 64-bit representation of double number is used.
In practice, such kind of operands are rarely used, so importance is low
(P=enhancement). Number of failing lit1 tests (-search=simple) = 2513.
I am almost sure that issue appears for other sub-targets as well, e.g. gfx8.
Lit1 tests attached.</pre>
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