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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Investigate whether or not we need a frame pointer"
href="https://llvm.org/bugs/show_bug.cgi?id=31346">31346</a>
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<th>Summary</th>
<td>Investigate whether or not we need a frame pointer
</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
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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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
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>In the past, we removed the frame pointer (R29R28). The code made the
assumption that the register would always contain the frame pointer.
If you look at the AVR-GCC wiki, it will always set up a frame pointer
<a href="https://gcc.gnu.org/wiki/avr-gcc">https://gcc.gnu.org/wiki/avr-gcc</a>
<span class="quote">> In order to access stack locations, avr-gcc will set up a 16-bit frame pointer in R29:R28 (Y) because the stack pointer (SP) cannot be used to access stack slots. </span >
We may need to add this back in in order to be compatible with the AVR-GCC
calling convention.</pre>
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</p>
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