<div dir="ltr">It is already enabled by default for GVNHoist, which is enabled by default at O1 and O2.<div>There are patches in progress to convert other passes under review.</div><div><br></div><div>We just branched for 3.9, and are in the midst of significant pass manager work, so i am not sure having a super-near term date makes sense?</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Aug 20, 2016 at 12:54 PM, Philip Reames <span dir="ltr"><<a href="mailto:listmail@philipreames.com" target="_blank">listmail@philipreames.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 08/20/2016 12:38 PM, Hal Finkel wrote:<br>
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In <a href="https://reviews.llvm.org/D23432#521624" rel="noreferrer" target="_blank">https://reviews.llvm.org/D2343<wbr>2#521624</a>, @reames wrote:<br>
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I am not actively objecting to this patch, but I really don't like the overall direction here. Having a threshold where our ability to optimize falls off a cliff just seems really undesirable. As Hal pointed out, there are likely options for summarizing alias sets to allow quicker AA queries. How much have we explored that design space?<br>
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My understanding from the discussion is that all uses of the ASTracker are going to be replaced with MemorySSA-based algorithms; that is why I was okay with this (for now). If we still need an AST concept, then we'll want to do something more sophisticated.<br>
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I haven't been following the MemorySSA work recently. Do we have a concrete near term date in mind for enabling MemorySSA? If not, I am not okay with an attitude of "MemorySSA will fix everything... someday". That's a very dangerous road to start walking down.<br>
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