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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 - Missing tail calls for large structs"
href="https://bugs.llvm.org/show_bug.cgi?id=35065">35065</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missing tail calls for large structs
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jmuizelaar@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The following code:
struct Foo {
int o[16];
};
__attribute__((noinline))
Foo moo()
{
return {0};
}
Foo goo()
{
return moo();
}
compiles to:
moo(): # @moo()
xorps xmm0, xmm0
movups xmmword ptr [rdi + 48], xmm0
movups xmmword ptr [rdi + 32], xmm0
movups xmmword ptr [rdi + 16], xmm0
movups xmmword ptr [rdi], xmm0
mov rax, rdi
ret
goo(): # @goo()
push rbx
mov rbx, rdi
call moo()
mov rax, rbx
pop rbx
ret
goo could just be:
goo():
jmp moo</pre>
</div>
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