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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - missing tailcall optimization"
href="https://llvm.org/bugs/show_bug.cgi?id=28417">28417</a>
</td>
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<tr>
<th>Summary</th>
<td>missing tailcall optimization
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vanyacpp@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>For this code LLVM generates code that doesn't use tailcall optimization.
struct token
{
char const* tok_start;
char const* tok_end;
int tok_type;
unsigned identifier_hash;
};
token f();
token g()
{
return f();
}
Generated code:
g(): # @g()
pushq %rbx
movq %rdi, %rbx
callq f()
movq %rbx, %rax
popq %rbx
retq
Expected code:
g(): # @g()
jmpq f()</pre>
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