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<p>My complements both on an informative writeup, and the completion
of a long and complicated effort. Thank you (and others) for all
the work on this. <br>
</p>
<p>Philip<br>
</p>
<div class="moz-cite-prefix">On 10/4/21 6:19 AM, Juneyoung Lee via
llvm-dev wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAJOWn3hgw-d71KddujxKZ7e1xC6EpDAQiRCxzv=8ddya_5EabA@mail.gmail.com">
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<div dir="ltr">Hello all,
<div><br>
</div>
<div>In early 2021, a transformation in InstCombine that folds
'select i1 %a, i1 %b, i1 false' to 'and i1 %a, %b' (and
another one for the 'or' case as well) was removed because the
folding was incorrect.</div>
<div><br>
</div>
<div>To explain the background about this change and a series of
patches that were made, I wrote a blog post:</div>
<div><a
href="https://aqjune.github.io/posts/2021-10-4.the-select-story.html"
moz-do-not-send="true">https://aqjune.github.io/posts/2021-10-4.the-select-story.html</a></div>
<div><br>
</div>
<div>I appreciate many people who helped fix it! :)<br>
</div>
<div><br>
</div>
<div>Sincerely,</div>
<div>Juneyoung</div>
</div>
<br>
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