<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jul 17, 2017 at 11:18 AM, Sanjoy Das via llvm-dev <span dir="ltr"><<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-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"> Hi,<br>
<span class=""><br>
On Mon, Jul 17, 2017 at 10:32 AM, Xinliang David Li <<a href="mailto:davidxl@google.com">davidxl@google.com</a>> wrote:<br>
> The issue blocks another optimization patch and Wei has spent huge amount of<br>
> effort isolating the the bootstrap failure to this same problem. I agree<br>
> with Wei that other developers may also get hit by the same issue and the<br>
> cost of leaving this issue open for long can be very high to the community.<br>
<br>
</span>I can't speak for others, but I am fine with adding a workaround for<br>
this. However, I suspect isGuaranteedNotToBeUndefOrPois<wbr>on in<br>
LoopUnswitch may regress other benchmarks.<br></blockquote><div><br></div><div>Any other thoughts on a more minimal fix?<br>Otherwise, it sounds like we can only try to find the fix that does the least damage.<br></div><div>We can't just leave it broken given it's triggering even in llvm bootstraps now :(</div><div><br></div></div></div></div>