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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Type pruning not working when casting/indirection is used"
href="https://bugs.llvm.org/show_bug.cgi?id=44212">44212</a>
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<th>Summary</th>
<td>Type pruning not working when casting/indirection is used
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>8.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>Stan.Kvasov@mediatek.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>Created <span class=""><a href="attachment.cgi?id=22887" name="attach_22887" title="testcase">attachment 22887</a> <a href="attachment.cgi?id=22887&action=edit" title="testcase">[details]</a></span>
testcase
Clang emits incorrect TBAA information when accessing a union member with any
kind of casting. In the example attached, r.w[i] gets the right TBAA type info
of omnipotent char. Any other access like ((int*)r.w)[i] or *(r.w + i) gets
TBAA int type. This leads to incorrect optimization as shown in the attachment.</pre>
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