<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Jan 19, 2012, at 5:31 AM, Jonas Paulsson wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Menlo; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="font-family: Tahoma; font-size: 13px; ">LLVM would have to be extended with an RegClass/register-attribute 'spillable'</span></span></blockquote><div><br></div><div>What exactly are you proposing? Why can't you do what the PowerPC and Hexagon targets do?</div><div><br></div><div>Spill-free register allocation sounds great, why not do it for all register classes?</div><br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Menlo; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="font-family: Tahoma; font-size: 13px; ">, and a register allocator would have to implement register pairing. That would be PBQP, right?</span></span></blockquote></div><br><div>If by pairing you mean GCC's multiple-alternatives, then PBQP should be able to support that.</div><div><br></div><div>/jakob</div><div><br></div></body></html>