<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br><div><div>On Jun 24, 2013, at 7:24 PM, Chandler Carruth <<a href="mailto:chandlerc@gmail.com">chandlerc@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div class="gmail_extra" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div class="gmail_quote"><br class="Apple-interchange-newline">On Mon, Jun 24, 2013 at 7:16 PM, Andrew Trick<span class="Apple-converted-space"> </span><span dir="ltr"><<a href="mailto:atrick@apple.com" target="_blank" class="cremed">atrick@apple.com</a>></span><span class="Apple-converted-space"> </span>wrote:<br><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;">I don't want to start a centi-thread yet, but here's a very rough idea (leaving many things out):</blockquote></div><br>I actually like the look of this. I'll hack things around so we have a flag (or set) we can use to experiment. It would be great to get the bits factored out of IndvarSimplify so that we can run the experiments more easily.</div><div class="gmail_extra" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br></div><div class="gmail_extra" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">I'm particularly interested in this if it addresses the regressions I hit with loop vectorize on by default.</div></blockquote></div><br><div>Another thing to look at is whether we need a GVN utility to run after LICM/Unswitch, or just run a fast non-iterative version of the pass a second time. Likewise, the vectorizer may rely on GVN now, but it should probably call a utility instead.</div><div><br></div><div>-Andy</div></body></html>