<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 31, 2015 at 7:27 AM, Robinson, Paul <span dir="ltr"><<a href="mailto:Paul_Robinson@playstation.sony.com" target="_blank">Paul_Robinson@playstation.sony.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">People ask about this from time to time, but we've never done anything about it.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">One thing I noticed about GCC –Og is that it's 99% identical to their –O1. </span></p></div></div></blockquote><div><br></div><div>Not really. The optimization level is set to 1, but the pass pipeline setup is very different between O1 and Og.</div><div><br></div><div>David</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> I'd be curious about people's experience using Clang –O1 –g and whether that experience
is somewhere close to reasonable.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">--paulr<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:cfe-dev-bounces@cs.uiuc.edu" target="_blank">cfe-dev-bounces@cs.uiuc.edu</a> [mailto:<a href="mailto:cfe-dev-bounces@cs.uiuc.edu" target="_blank">cfe-dev-bounces@cs.uiuc.edu</a>]
<b>On Behalf Of </b>David Blaikie<br>
<b>Sent:</b> Wednesday, July 29, 2015 10:13 AM<br>
<b>To:</b> Dan Walmsley; cfe-dev Developers<span class=""><br>
<b>Subject:</b> Re: [cfe-dev] Clangs equivalent to GCCs -Og flag?<u></u><u></u></span></span></p>
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<p class="MsoNormal">On Wed, Jul 29, 2015 at 8:42 AM, Dan Walmsley <<a href="mailto:dan@walms.co.uk" target="_blank">dan@walms.co.uk</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Thanks, <u></u><u></u></p>
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<p class="MsoNormal"> Perhaps there might be some documentation somewhere that would give me an idea of which optimizations to enable individually?<u></u><u></u></p>
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Not really - optimized debug info is still pretty lacking in Clang. Even the most common/basic optimizations (SROA, for example) are going to pretty heavily impact debuggability today.<br>
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- Dave<br>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Dan<u></u><u></u></p>
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<p class="MsoNormal">Date: Wed, 29 Jul 2015 06:40:06 -0700<br>
Subject: Re: [cfe-dev] Clangs equivalent to GCCs -Og flag?<br>
From: <a href="mailto:dblaikie@gmail.com" target="_blank">dblaikie@gmail.com</a><br>
To: <a href="mailto:dan@walms.co.uk" target="_blank">dan@walms.co.uk</a><br>
CC: <a href="mailto:cfe-dev@cs.uiuc.edu" target="_blank">cfe-dev@cs.uiuc.edu</a><u></u><u></u></p>
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On Jul 29, 2015 3:23 AM, "Dan Walmsley" <<a href="mailto:dan@walms.co.uk" target="_blank">dan@walms.co.uk</a>> wrote:<br>
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> GCC has a debug level flag of -Og which enables all optimizers that won't degrade the debugging experience greatly.<br>
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> Does clang have an equivalent?<u></u><u></u></p>
<p>No, clang had no equivalent at this time.<u></u><u></u></p>
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> Thanks in advance.<br>
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> Dan<br>
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