<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On May 29, 2015, at 8:20 AM, Bruno Cardoso Lopes <<a href="mailto:bruno.cardoso@gmail.com" class="">bruno.cardoso@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span 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; float: none; display: inline !important;" class="">My patch to improve vector legalization for pop count from<span class="Apple-converted-space"> </span></span><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__reviews.llvm.org_D10002&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=mQ4LZ2PUj9hpadE3cDHZnIdEwhEBrbAstXeMaFoB9tg&m=hQAmO1HnP7cx9D9GF8mrBpe04DVl0ynCdA45nyjTlnc&s=lTJgeymU2gy0Kf0cIse8HtDNvtWFsTAH-LdPc5340Eo&e=" 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;" class="">http://reviews.llvm.org/D10002</a><span 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; float: none; display: inline !important;" class=""><span class="Apple-converted-space"> </span>is certainly a win here, but won't certainly beat using ARM64's native popcnt on vXi8 and building the results for wider types on top of that!</span></div></blockquote></div><br class=""><div class="">I wasn’t actually suggesting not using ARM64’s native vXi8 instructions, but rather the rest of the sequence that synthesizes wider lane pop counts on top of it.</div><div class=""><br class=""></div><div class="">—Owen</div></body></html>