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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - problem with long long bitfield"
href="http://llvm.org/bugs/show_bug.cgi?id=17299">17299</a>
</td>
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<tr>
<th>Summary</th>
<td>problem with long long bitfield
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.2
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>yflelion@hotmail.fr
</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>Created <span class=""><a href="attachment.cgi?id=11245" name="attach_11245" title="problem with long long bitfield">attachment 11245</a> <a href="attachment.cgi?id=11245&action=edit" title="problem with long long bitfield">[details]</a></span>
problem with long long bitfield
Hello,
I find that there is a problem when a bitfield of size greater than 32 bits are
used (with a long long), which is not in the ansi c (although there is no error
message or warning when it is used).
The problem arises when we take for example a 40-bit bitfield, and we shift it
to the left by 32(the result is 64-bit instead of 40), in contrast to what gcc
does.
In the attached file foo is equal to 0 with gcc (which seems the most correct)
and foo equals 0x10000000000 with clang.
In attached file you can find the example I used.
compilers used for comparison are:
clang: v3.2 (final tags/RELEASE_32)
Target: x86_64-unknown-linux-gnu
Thread model: posix
gcc (Ubuntu / Linaro 4.6.3-lubuntu5) 4.6.3
Thanks in advance for your help.
Best Regards,
Youssef Fahmi.</pre>
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