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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing optimization for member function with const attribute"
href="https://bugs.llvm.org/show_bug.cgi?id=50735">50735</a>
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<th>Summary</th>
<td>Missing optimization for member function with const attribute
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
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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>Backend: C
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zhongyunde@tom.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>refer to <a href="https://developer.arm.com/documentation/dui0491/c/Cacgigch">https://developer.arm.com/documentation/dui0491/c/Cacgigch</a>, if we
defined the following function Function_Attributes_const_0 with __attribute__
((const)), code Function_Attributes_const_0 might be called once only, with
the result being doubled to obtain the correct return value.
int Function_Attributes_const_0(int b) __attribute__ ((const));
int test (int b)
{
int aLocal=0;
aLocal += Function_Attributes_const_0(b);
aLocal += Function_Attributes_const_0(b);
return aLocal;
}
while we change the function into member function as following, then code
Function_Attributes_const_0 might be called twice, so it seems missing
optimization for member function.
class foo {
public:
int Function_Attributes_const_0(int b) const;
};
int test (int b)
{
int aLocal=1;
class foo fuc;
aLocal += fuc.Function_Attributes_const_0(b);
aLocal += fuc.Function_Attributes_const_0(b);
return aLocal;
}</pre>
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