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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [PM] Remove use of old PM in the middle-end."
href="https://llvm.org/bugs/show_bug.cgi?id=28322">28322</a>
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<th>Summary</th>
<td>[PM] Remove use of old PM in the middle-end.
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chisophugis@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Blocks</th>
<td>28315
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Right now, each pass/analysis we port has to keep a legacy shim which is
actually a nontrivial amount of code (although it varies from pass to pass).
Perhaps most importantly it forces awkward patterns for the core pass logic,
essentially requiring there to be 3 interfaces to be implemented:
1. the old PM interface
2. the new PM interface
3. a weird (and inconsistent across passes) meta-interface that both 1. and 2.
can be implemented in terms of.
Often, 3. takes the form of passing in the analysis objects explicitly or
passing a callback that lazily constructs them.</pre>
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</p>
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