We do, implicitly, because assert generates if conditions. Or at least, gvn knows how to propagate that implicit info. We can do better by exposing it more, most likely<br><br><div class="gmail_quote"><div dir="ltr">On Fri, Jun 10, 2016, 5:59 PM Lawrence, Peter <<a href="mailto:c_plawre@qca.qualcomm.com">c_plawre@qca.qualcomm.com</a>> wrote:<br></div><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">Daniel,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> Well then my next (dumb?) question is why aren’t we using source level assert information<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">For optimization ?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">--Peter Lawrence.<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Daniel Berlin [mailto:<a href="mailto:dberlin@dberlin.org" target="_blank">dberlin@dberlin.org</a>]
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<b>Sent:</b> Friday, June 10, 2016 5:39 PM<br>
<b>To:</b> Lawrence, Peter <<a href="mailto:c_plawre@qca.qualcomm.com" target="_blank">c_plawre@qca.qualcomm.com</a>><br>
<b>Cc:</b> <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<b>Subject:</b> Re: [llvm-dev] Early CSE clobbering llvm.assume<u></u><u></u></span></p></div></div><div lang="EN-US" link="blue" vlink="purple"><div>
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<p class="MsoNormal">On Fri, Jun 10, 2016 at 5:34 PM, Lawrence, Peter via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">My (dumb?) question would be: why is llvm.assume being handled any differently than llvm.assert ?<u></u><u></u></p>
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<p class="MsoNormal">There is no llvm.assert intrinsic, so i'm not sure what you mean here. Care to give an example?<u></u><u></u></p>
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<p class="MsoNormal">Other than one trapping and one not-trapping, they should be identical, in both cases they are giving<u></u><u></u></p>
<p class="MsoNormal">The optimizers information, and that shouldn’t be any different from being inside an “if” statement with the same condition ?<u></u><u></u></p>
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