<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br><div><div>On Mar 13, 2013, at 11:01 AM, Renato Golin <<a href="mailto:renato.golin@linaro.org">renato.golin@linaro.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><div dir="ltr">On 13 March 2013 17:57, Jim Grosbach<span class="Apple-converted-space"> </span><span dir="ltr"><<a href="mailto:grosbach@apple.com" target="_blank">grosbach@apple.com</a>></span><span class="Apple-converted-space"> </span>wrote:<br><div class="gmail_extra"><div class="gmail_quote"><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;"><div style="word-wrap: break-word;"><div class="im"><blockquote type="cite"><div lang="EN-US" link="blue" vlink="purple" style="letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px;"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);">It seems to me that LLVM doesn’t parse the inline asm body. It just checks the constraints, (ie. Input/output interface). During ASM writing, it then binding those constraints to placeholders like %0, %1. </span></div></div></blockquote><div><span style="color: rgb(34, 34, 34);">This is correct.</span></div></div></div></blockquote><div><br></div><div>Ok, so maybe checking all possible ways to require paired registers is not such a bad idea after all.</div><div><br></div></div></div></div></div></blockquote><div><br></div><div>The constraints are the right way to do it. There shouldn't be any magic beyond that.</div><div><br></div><div>-Jim</div></div></body></html>