<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 Jan 4, 2013, at 3:07 PM, "Gurd, Preston" <<a href="mailto:preston.gurd@intel.com">preston.gurd@intel.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><br style="font-family: Helvetica; font-size: medium; 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-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span style="font-family: Helvetica; font-size: medium; 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-text-size-adjust: auto; -webkit-text-stroke-width: 0px; display: inline !important; float: none; ">The reason that we decided to use a pass instead of a peephole optimization was that we felt we had to deal with control flow, which did not seem possible using peephole optimization.</span></blockquote></div><br><div>Hi Preston, </div><div><br></div><div>Please look at llvm::TargetInstrInfo::optimizeCompareInsr. You could do something similar with the 'ret' instruction. <div></div></div><div><br></div><div>Thanks,</div><div>Nadav</div></body></html>