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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion in CGClass.cpp: Bad field alignment"
href="http://llvm.org/bugs/show_bug.cgi?id=21232">21232</a>
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<th>Summary</th>
<td>Assertion in CGClass.cpp: Bad field alignment
</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>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<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>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>warren_ristow@playstation.sony.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following volatile bitfield test-case:
// ================ test.cpp ================
struct BB {
virtual void d();
volatile char e : 8;
char f : 1;
char g;
};
BB i() {
static BB j;
return j;
}
// ==========================================
hits an assertion-failure:
$ clang++ --version
clang version 3.6.0 (trunk 219414)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ clang++ -c -O0 test.cpp
clang: .../llvm/tools/clang/lib/CodeGen/CGClass.cpp:831:
void {anonymous}::FieldMemcpyizer::emitMemcpy(): Assertion
`(CGF.getContext().toCharUnitsFromBits(FirstFieldOffset) % Alignment) == 0
&& "Bad field alignment."' failed.
.
.
.
$
In experiments, significantly older versions (Clang 3.2 based) compiled it
without error.
The problem was found on an x86_64 target, but also tested with '-target ppu',
and it failed the same way.</pre>
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</p>
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