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<p>This is interesting, and might be useful. I don't know that this
is broadly useful enough for upstream inclusion, but if you could
post this to github somewhere, I might play with it.</p>
<p>There might also be room to factor out common functionality.
We've also run into the need to print whole-module instead of
containing construct (i.e. this loop). If we added upstream
support for something along the lines of -print-module-after-all,
building the git history could easily be done as a post processing
step. <br>
</p>
<p>Philip<br>
</p>
<br>
<div class="moz-cite-prefix">On 03/06/2018 10:43 AM, Alexandre
Isoard via llvm-dev wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CANLM5LdprkmGkTtv0ck-DXVoc+nVtdpmfQdjzT-YRPZ_Ym40FA@mail.gmail.com">
<div dir="ltr">Hello,
<div><br>
</div>
<div>I had a stupid idea recently that turned out not so stupid
after all. I wanted to be able to "see" an entire pass
pipeline in action to find unnecessary transformations and/or
missed opportunities and generally improve the debug-ability
of LLVM.</div>
<div><br>
</div>
<div>So as the title suggest, I implemented an equivalent of
"-print-after-all" but instead of printing into stdout I dump
into a file that get commit into a temporary git. There are
some quirks with it but it's working and is actually awesome.
For example, at first sight, I see multiple time lcssa and
instcombine cancelling each other's work.</div>
<div><br>
</div>
<div>Of course, that has a big impact on compile time when
enabled, but that's still practical (git being quite good at
its job) when debugging.</div>
<div><br>
</div>
<div>There are improvement I can make, but would you guys be
interested in such feature?</div>
<div>
<div><br>
</div>
-- <br>
<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr"><b>Alexandre Isoard</b><br>
</div>
</div>
</div>
</div>
<br>
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