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<p>Hi, Doru,</p>
<p>What's the underlying problem and how does clang-ykt fix it? Do we have open reviews that resolve this upstream?</p>
<p>I recall that these functions are provided by libdevice.*.bc and that some renaming needs to happen to get this to work. Also, I recall there being some reviews open on this, but I don't now recall which ones and where.<br>
</p>
<p>Thanks again,</p>
<p>Hal<br>
</p>
<div class="moz-cite-prefix">On 3/19/19 9:22 AM, Gheorghe-Teod Bercea via Openmp-dev wrote:<br>
</div>
<blockquote type="cite" cite="mid:OFD657F2D3.BE3A6EC9-ON002583C2.004E8AA8-852583C2.004EEB73@notes.na.collabserv.com">
<font size="2" face="sans-serif">Hi James,</font><br>
<br>
<font size="2" face="sans-serif">If you're installing the compiler from source please use the following version.</font><br>
<br>
<font size="2" face="sans-serif">This is a mirror of trunk:</font><br>
<br>
<a href="https://github.com/clang-ykt" moz-do-not-send="true"><font size="2" face="sans-serif" color="blue">https://github.com/clang-ykt</font></a><br>
<br>
<font size="2" face="sans-serif">Clone Clang, LLVM and OpenMP runtime.</font><br>
<br>
<font size="2" face="sans-serif" color="#008000">IMPORTANT: For each repo checkout
<b>patched-upstream</b> branch.</font><br>
<br>
<font size="2" face="sans-serif">The Clang <b>patched-upstream</b> branch contains a patch that fixes your problem.</font><br>
<br>
<font size="2" face="sans-serif">Thanks,</font><br>
<br>
<font size="2" face="sans-serif">--Doru</font><br>
<font size="2" face="sans-serif"><br>
</font><br>
<br>
<br>
<br>
<font size="1" face="sans-serif" color="#5f5f5f">From: </font><font size="1" face="sans-serif">James Price via Openmp-dev
<a class="moz-txt-link-rfc2396E" href="mailto:openmp-dev@lists.llvm.org"><openmp-dev@lists.llvm.org></a></font><br>
<font size="1" face="sans-serif" color="#5f5f5f">To: </font><font size="1" face="sans-serif"><a class="moz-txt-link-rfc2396E" href="mailto:openmp-dev@lists.llvm.org">"openmp-dev@lists.llvm.org"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:openmp-dev@lists.llvm.org"><openmp-dev@lists.llvm.org></a></font><br>
<font size="1" face="sans-serif" color="#5f5f5f">Date: </font><font size="1" face="sans-serif">03/19/2019 07:51 AM</font><br>
<font size="1" face="sans-serif" color="#5f5f5f">Subject: </font><font size="1" face="sans-serif">[Openmp-dev] Math functions when offloading to CUDA devices</font><br>
<font size="1" face="sans-serif" color="#5f5f5f">Sent by: </font><font size="1" face="sans-serif">"Openmp-dev"
<a class="moz-txt-link-rfc2396E" href="mailto:openmp-dev-bounces@lists.llvm.org">
<openmp-dev-bounces@lists.llvm.org></a></font><br>
<hr noshade="noshade">
<br>
<br>
<br>
<tt><font size="2">Hi,<br>
<br>
One of the issues we frequently hit when using the Clang OpenMP implementation on NVIDIA GPUs is the lack of support for many common math functions (e.g. cos/sin). Trying to use them produces errors of the form:<br>
<br>
fatal error: error in backend: Cannot select: 0x47b33a0: f64 = fsin 0x47b2f90<br>
<br>
Translating math functions in target regions is listed as a feature that isn’t supported yet, but is this something that is expected to be implemented soon? Failing that, if someone can describe the desired approach to implement this I might be able to take
a stab at getting some initial patches together (depending on the complexity).<br>
<br>
Some functions such as sqrt work fine, but I assume this is because they map directly to NVVM intrinsics.<br>
<br>
Cheers,<br>
<br>
James<br>
<br>
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<br>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</blockquote>
<pre class="moz-signature" cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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