<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Feb 27, 2013, at 11:24 AM, Eric Christopher <<a href="mailto:echristo@gmail.com">echristo@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Feb 26, 2013 at 8:37 PM, Michael Ilseman <span dir="ltr"><<a href="mailto:milseman@apple.com" target="_blank">milseman@apple.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im"><br>
On Feb 26, 2013, at 3:30 PM, Eli Bendersky <<a href="mailto:eliben@google.com">eliben@google.com</a>> wrote:<br>
<br>
> Can you provide more background for this change? Is it being done for<br>
> the sake of debugging? What are the intended use cases?<br>
><br>
<br>
</div>Sure! Debugging can definitely be improved by this, but this also gives targets more flexibility. Targets can fast-isel better code with more coverage in some situations. For example, SelectOperator(), even when it returns false, has side-effects and can schedule IR instructions to be fast-iselled that otherwise never would. This becomes particularly unfortunate when such instructions trigger the DAG slow-path.<br>
<div class="HOEnZb"><div class="h5"><br></div></div></blockquote><div><br></div><div style="">Is there anything that's going to be using this any time soon? Something that doesn't use the target independent fast isel path?</div>
<div style=""><br></div></div></div></div></blockquote><div><br></div><div>There is an out-of-tree backend currently using it.</div><br><blockquote type="cite"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div style="">-eric </div></div></div></div>
</blockquote></div><br></body></html>