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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed accumulator recursion elimination"
href="https://bugs.llvm.org/show_bug.cgi?id=51461">51461</a>
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<th>Summary</th>
<td>Missed accumulator recursion elimination
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm@rifkin.dev
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Of the following simple recursive functions, LLVM is able to eliminate
recursion for foo but not bar:
int foo(int n) {
if(n <= 0) return 1;
return 2 + foo(n - 1);
}
int bar(int n) {
if(n <= 0) return 1;
return 2 * bar(n - 1);
}
GCC optimizes both. <a href="https://godbolt.org/z/rozMcn6o4">https://godbolt.org/z/rozMcn6o4</a>.</pre>
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