<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Oct 4, 2019, at 15:28, Sjoerd Meijer via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Thanks for your replies. That was a very useful discussion.</div></div></blockquote></div><div><blockquote type="cite" class=""><div class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">I won't recommit on a Friday afternoon, but will do on Monday, as it looks like we agreed again on the direction and the change.</div></div></blockquote><div><br class=""></div><div>Sound good to me.</div><div><br class=""></div><blockquote type="cite" class=""><div class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">Orthogonal to this change, the interesting topics brought up are improved diagnostics, and the cases the vectoriser misses. <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">I will briefly look why this particular case isn't vectorised, but I suspect that it's a simple case of some prep / clean-up passes not running at Oz.</span></div></div></blockquote><br class=""></div><div>I think the problem is that loop-rotate skips the loop at -Oz and loop-vectorize requires loops to exit via the latch.</div><div><br class=""></div><div>Cheers,</div><div>Florian</div><br class=""></body></html>