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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AVR] Optimize 16-bit comparisions with zero"
href="https://llvm.org/bugs/show_bug.cgi?id=31575">31575</a>
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<th>Summary</th>
<td>[AVR] Optimize 16-bit comparisions with zero
</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>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AVR
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>dylanmckay34@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Currently when we try and perform a 16-bit comparision with zero, we generate
the following code:
ldi r24, 0
ldi r25, 0
cp r26, r24
cpc r27, r25
breq LBB0_4
We can simplify this to
ldi r24, 0
cp r26, r24
cpc r27, r24
And save a register</pre>
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