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PUBLIC<br>
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<p class="msipheader7557e74b" style="margin:0in"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#317100">PUBLIC</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Indeed, I am using 9.0.1. I’ll try upgrading. Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Simon Peyton Jones <simonpj@microsoft.com>
<br>
<b>Sent:</b> Wednesday, October 6, 2021 6:12 PM<br>
<b>To:</b> Erdi, Gergo <Gergo.Erdi@sc.com><br>
<b>Cc:</b> Montelatici, Raphael Laurent <Raphael.Montelatici@sc.com>; GHC <ghc-devs@haskell.org><br>
<b>Subject:</b> [External] RE: Specialisation doesn't kick in (RE: Instantiation of overloaded definition *in Core*)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Grego, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Yes I think that should auto-specialise.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Which version of GHC are you using? Do you have this patch?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="Code">commit ef0135934fe32da5b5bb730dbce74262e23e72e8<o:p></o:p></p>
<p class="Code">Author: Simon Peyton Jones <a href="mailto:simonpj@microsoft.com">
<span style="font-family:"Calibri",sans-serif">simonpj@microsoft.com</span></a><o:p></o:p></p>
<p class="Code">Date: Thu Apr 8 22:42:31 2021 +0100<o:p></o:p></p>
<p class="Code"><o:p> </o:p></p>
<p class="Code"> Make the specialiser handle polymorphic specialisation<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here’s why I ask. The call <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Lucida Console";mso-fareast-language:EN-GB">$fMonadIO_$c>> = \ (@a) (@b) -> $dm>> @IO $fMonadIO @a @b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console";mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal">indeed applies $dm>> to $fMonadIO, but it also applies it to a and b. In the version of GHC you have, maybe that stops the call from floating up to the definition site, and being used to specialise it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can you make a repro case without your plugin?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;mso-fareast-language:EN-GB">PS: I am leaving Microsoft at the end of November 2021, at which point
<a href="mailto:simonpj@microsoft.com"><span style="color:#0563C1">simonpj@microsoft.com</span></a> will cease to work. Use
<a href="mailto:simon.peytonjones@gmail.com"><span style="color:#0563C1">simon.peytonjones@gmail.com</span></a> instead. (For now, it just forwards to
<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>.)<o:p></o:p></span></p>
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