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<body><span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - static_cast<T*>(this) does not propagate non-null invariant of 'this'"
href="https://bugs.llvm.org/show_bug.cgi?id=35909">bug 35909</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - static_cast<T*>(this) does not propagate non-null invariant of 'this'"
href="https://bugs.llvm.org/show_bug.cgi?id=35909#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - static_cast<T*>(this) does not propagate non-null invariant of 'this'"
href="https://bugs.llvm.org/show_bug.cgi?id=35909">bug 35909</a>
from <span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span></b>
<pre>Should be fixed with:
<a href="https://reviews.llvm.org/rL322950">https://reviews.llvm.org/rL322950</a>
With that change, everything proceeds as before until after inlining. When we
run instcombine after that, we kill the null check because the GEP is now known
to be inbounds:
IC: Visiting: %sub.ptr2.i = getelementptr inbounds %class.B, %class.B* %b,
i64 -1
IC: Visiting: %1 = bitcast %class.B* %sub.ptr2.i to %class.A*
IC: Visiting: %tobool1 = icmp eq %class.A* %1, null
IC: Replacing %tobool1 = icmp eq %class.A* %1, null
with i1 false</pre>
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