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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D">Yes I agree: native Int#!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> ghc-devs [mailto:ghc-devs-bounces@haskell.org]
<b>On Behalf Of </b>Carter Schonwald<br>
<b>Sent:</b> 15 August 2013 17:43<br>
<b>To:</b> Jan Stolarek<br>
<b>Cc:</b> ghc-devs<br>
<b>Subject:</b> Re: Change return type for Int64# and Word64# comparisons?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please use native size. Eg Int# and/or Word#<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Booleans should always always be a size that fits in native registers. (If there's good reasons to the contrary, I'd love to hear them)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks Luite for noticing this!<o:p></o:p></p>
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<p class="MsoNormal"><br>
On Thursday, August 15, 2013, Jan Stolarek wrote:<o:p></o:p></p>
<p class="MsoNormal">> for me personally Bool would be even better<br>
To get a Bool you can use wrappers defined in the same module, e.g.:<br>
<br>
geInt64# :: Int64# -> Int64# -> Bool<br>
geInt64# a b = tagToEnum# (int64ToInt# (geInt64## a b))<br>
<br>
Looking at the implementation of this wrapper I think Luite has a point - to get a Bool it has to be caste to a machine supported Int#. So I think that it would make sense to have these primops retunr Int# instead of Int64#, but I'd like to hear what others
have to say.<br>
<br>
Janek<br>
<br>
<br>
<br>
<br>
----- Oryginalna wiadomość -----<br>
Od: "Luite Stegeman" <<a href="javascript:;">stegeman@gmail.com</a>><br>
Do: "ghc-devs" <<a href="javascript:;">ghc-devs@haskell.org</a>><br>
Wysłane: czwartek, 15 sierpień 2013 16:36:59<br>
Temat: Change return type for Int64# and Word64# comparisons?<br>
<br>
<br>
<br>
Hi all,<br>
<br>
<br>
With the recent change of comparison primops to return Int# instead of Bool, the 64 bit operations were also changed, to return Int64# or Word64#:<br>
<br>
<br>
<a href="https://github.com/jstolarek/packages-ghc-prim/commit/07920f03d76dbaec64e3829404d332af22d744fe" target="_blank">https://github.com/jstolarek/packages-ghc-prim/commit/07920f03d76dbaec64e3829404d332af22d744fe</a><br>
<br>
<br>
<br>
It seems a bit wasteful to me to return a value bigger than a machine word for just a boolean. Changing the type to Int# would make the same optimizations possible as for the native-sized primops (though since they map to JavaScript bools in GHCJS).<br>
<br>
<br>
thoughts?<br>
<br>
<br>
luite<br>
<br>
<br>
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