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<body><span class="vcard"><a class="email" href="mailto:david.majnemer@gmail.com" title="David Majnemer <david.majnemer@gmail.com>"> <span class="fn">David Majnemer</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - wrong code (generated code hangs) at -O3 on x86_64-linux-gnu in 32-bit and 64-bit modes"
href="https://llvm.org/bugs/show_bug.cgi?id=28402">bug 28402</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>david.majnemer@gmail.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>DUPLICATE
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - wrong code (generated code hangs) at -O3 on x86_64-linux-gnu in 32-bit and 64-bit modes"
href="https://llvm.org/bugs/show_bug.cgi?id=28402#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - wrong code (generated code hangs) at -O3 on x86_64-linux-gnu in 32-bit and 64-bit modes"
href="https://llvm.org/bugs/show_bug.cgi?id=28402">bug 28402</a>
from <span class="vcard"><a class="email" href="mailto:david.majnemer@gmail.com" title="David Majnemer <david.majnemer@gmail.com>"> <span class="fn">David Majnemer</span></a>
</span></b>
<pre>Bisection points to r272267:
Author: Haicheng Wu <<a href="mailto:haicheng@codeaurora.org">haicheng@codeaurora.org</a>>
Date: Thu Jun 9 15:24:29 2016 +0000
Reapply "[MBP] Reduce code size by running tail merging in MBP.""
This reapplies commit r271930, r271915, r271923. They hit a bug in
Thumb which is fixed in r272258 now.
The original message:
The code layout that TailMerging (inside BranchFolding) works on is not the
final layout optimized based on the branch probability. Generally, after
BlockPlacement, many new merging opportunities emerge.
This patch calls Tail Merging after MBP and calls MBP again if Tail Merging
merges anything.
Likely the same bug as PR28307.
*** This bug has been marked as a duplicate of <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - wrong code at -O3 on x86_64-linux-gnu (in both 32-bit and 64-bit modes)"
href="show_bug.cgi?id=28307">bug 28307</a> ***</pre>
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