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<p class="MsoNormal"><span style="font-family:"Courier New";color:#44546A">I’m working on fneg. I started with the IRBuilder and found that some of the transformation passes use it. Updating the m_FNeg() matchers gets me farther, but the InstCombiner doesn’t
know how to deal with a non-BinaryOperator.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#44546A">Sorry for the delay in responding to this thread, but I’ve been out of the country and am a little behind on email.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:#44546A">--</span><span style="color:#44546A">
<br>
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#44546A">Kevin P. Neal</span><span style="color:#44546A"><br>
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#44546A">SAS/C and SAS/C++ Compiler<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:#44546A">Host Research and Development<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:#44546A">SAS Institute, Inc.</span><span style="color:#44546A"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#44546A"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> llvm-dev <llvm-dev-bounces@lists.llvm.org> <b>On Behalf Of
</b>Arsenault, Matthew via llvm-dev<br>
<b>Sent:</b> Friday, March 29, 2019 5:52 PM<br>
<b>To:</b> Michael Berg <michael_c_berg@apple.com>; llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> Re: [llvm-dev] EuroLLVM Numerics issues<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p><b><i><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:red">EXTERNAL</span></i></b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:red">
</span><o:p></o:p></p>
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<p class="MsoNormal">A few things I’ve been thinking about:<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3">Is anyone working on finishing the migration to using the new fneg instruction?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3">Controls for allowing and/or mandating denormal flushing<o:p></o:p></li></ul>
<ul style="margin-top:0in" type="disc">
<ul style="margin-top:0in" type="circle">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo3">Making denormal-fp-math attribute per FP type<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo3">FTZ flag<o:p></o:p></li></ul>
</ul>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3">Dealing with constrained and unconstrained versions of target FP intrinsics<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3">Can we define a policy or general direction for snan handling?<o:p></o:p></li></ul>
<ul style="margin-top:0in" type="disc">
<ul style="margin-top:0in" type="circle">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo3">Relatedly, llvm.minnum/llvm.maxnum should be renamed to fmin/fmax, and a new set of minnum/maxnum that follow the defined snan behavior are needed. This would give 3 complete sets
of min/max intrinsics<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo3">Are target features/attributes allowed to change the behavior of standard operations/intrinsics?<o:p></o:p></li></ul>
</ul>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3">Adding FP min/max to atomicrmw, and which versions are needed<o:p></o:p></li></ul>
<p class="MsoListParagraph"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">llvm-dev <<a href="mailto:llvm-dev-bounces@lists.llvm.org">llvm-dev-bounces@lists.llvm.org</a>> on behalf of llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>><br>
<b>Reply-To: </b>Michael Berg <<a href="mailto:michael_c_berg@apple.com">michael_c_berg@apple.com</a>><br>
<b>Date: </b>Friday, March 29, 2019 at 1:05 PM<br>
<b>To: </b>llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>><br>
<b>Subject: </b>[llvm-dev] EuroLLVM Numerics issues<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">All: There will be a BoF talk at the EuroLLVM conference regarding Numerics (FMF and module flags which control fp behavior and optimization).<br>
<br>
Even if you are not going to be in attendance, please reply to this thread as we are collecting open issues and ideas for future direction in all layers of LLVM for which optimizations are controlled by numerics flags. Please read over the numerics blog if
you like for reference material:<br>
<br>
<a href="http://blog.llvm.org/2019/03/llvm-numerics-blog.html">http://blog.llvm.org/2019/03/llvm-numerics-blog.html</a>
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">p.s. (restarting this thread here).<br>
<br>
Regards,<br>
Michael<o:p></o:p></p>
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