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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang generates broken module, "Instruction does not dominate all uses!""
href="http://llvm.org/bugs/show_bug.cgi?id=21220">21220</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang generates broken module, "Instruction does not dominate all uses!"
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.majnemer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat t.cpp
struct s {
char c[33];
};
struct t {
t(const s &);
};
extern int a;
void fn1() {
switch (a) {
case 0:
*new t(s());
case 1:
(t(s()));
}
}
$ ~/llvm/Debug+Asserts/bin/clang -cc1 -x c++ t.cpp -o - -emit-llvm -O1
-fexceptions
t.cpp:11:5: warning: expression result unused
*new t(s());
^~~~~~~~~~~
Instruction does not dominate all uses!
%call = call noalias i8* @_Znwm(i64 1) #4
call void @_ZdlPv(i8* %call) #5
fatal error: error in backend: Broken function found, compilation aborted!</pre>
</div>
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