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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash due to unhandled cast causing an UNREACHABLE to be executed at llvm/include/llvm/CodeGen/BasicTTIImpl.h:590"
href="https://bugs.llvm.org/show_bug.cgi?id=33193">33193</a>
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<th>Summary</th>
<td>Crash due to unhandled cast causing an UNREACHABLE to be executed at llvm/include/llvm/CodeGen/BasicTTIImpl.h:590
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>douglas_yung@playstation.sony.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Commit r303763 started causing a crash to occur on one of our internal
codebases.
Consider the following code:
/***** repro.cpp ******/
struct d;
template < typename > class A;
class B
{
public:
typedef d *pointer;
pointer _Myfirst;
pointer _Mylast;
};
template < class = A < int >>class D:B
{
public:
long m_fn1 ()
{
return _Mylast - _Myfirst;
}
d & operator[] (long p1)
{
return *(_Myfirst + p1);
}
};
struct d
{
int m_hNodeID;
bool uw;
};
class C
{
void m_fn2 ();
D < >m_d;
};
void
C::m_fn2 ()
{
for (unsigned i = 0; i < m_d.m_fn1 (); ++i)
m_d[i].uw = false;
}
/***** repro.cpp ******/
If you compile the above with the following command:
clang.exe -cc1 -triple x86_64-scei-ps4 -emit-obj -O2 -vectorize-loops repro.cpp
You will see the following crash in the compiler:
Unhandled cast
UNREACHABLE executed at C:\src\llvm\include\llvm/CodeGen/BasicTTIImpl.h:590!</pre>
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