<div dir="ltr"><div>I don't know how others feel, but it seems this was removed more by feeling and less by actual data points. It doesn't mean it wasn't the correct choice, but just because nobody spoke up could mean that they silently enjoy the benefits and maybe some end user far away isn't subscribed. With this in mind - I hope others would consider turning optimizations into an Assert, Warning or Error if they will be removed - at least for a release. That way there's some visible warning that users had a chance to see and potentially relay the feedback. The middle ground could be disabling the transformation and just warning on the analysis pass. "Foo optimization has been removed and it may impact your code performance"...<br><br></div>Too much work?<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jul 1, 2017 at 9:32 AM, Chandler Carruth via cfe-dev <span dir="ltr"><<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Already added in the commit (I think)</div><div class="HOEnZb"><div class="h5"><br><div class="gmail_quote"><div dir="ltr">On Fri, Jun 30, 2017 at 3:58 PM Hans Wennborg <<a href="mailto:hans@chromium.org" target="_blank">hans@chromium.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Thu, Jun 29, 2017 at 3:42 PM, Chandler Carruth via cfe-dev<br>
<<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>> wrote:<br>
> If you don't use BBVectorize at all, you can ignore this.<br>
><br>
> Hal suggested this in a thread in 2014:<br>
> <a href="http://lists.llvm.org/pipermail/llvm-dev/2014-November/079091.html" rel="noreferrer" target="_blank">http://lists.llvm.org/<wbr>pipermail/llvm-dev/2014-<wbr>November/079091.html</a><br>
><br>
> None objected then, and I don't think any new uses have arisen so I plan to<br>
> just remove it. It is causing maintenance burden, complexity, and is a set<br>
> of features I'd rather not port to the new PM.<br>
><br>
> Just an FYI email to folks so they aren't confused when the patches land.<br>
<br>
Maybe worth mentioning in the release notes?<br>
</blockquote></div>
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