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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>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode"
href="https://llvm.org/bugs/show_bug.cgi?id=30841">bug 30841</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode"
href="https://llvm.org/bugs/show_bug.cgi?id=30841#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode"
href="https://llvm.org/bugs/show_bug.cgi?id=30841">bug 30841</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>Dangers of trying to make better DAG folds noted...
Hopefully fixed with:
<a href="https://reviews.llvm.org/rL285656">https://reviews.llvm.org/rL285656</a>
Thanks, Zhendong!
Note: I skimmed the rest of InstCombiner::SimplifyDemandedUseBits(), and this
appears to be the only case where we need to clear nsw/nuw.
It would obviously be better if there was some way to share the demanded bits
logic between IR and the DAG.</pre>
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