<div dir="ltr">when i run <div>./inplace/bin/ghc-stage2 codetester.hs -O2 -dcore-lint -S -fforce-recomp -ddump-simpl -ddump-to-file –dverbose-core2core –ddump-occur-anal –ddump-inlinings<div>i get </div><div>target ‘–dverbose-core2core’ is not a module name or a source file<br></div><div><br></div><div>what am I doing wrong in this CLI invocation? </div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Nov 24, 2014 at 10:23 AM, Simon Peyton Jones <span dir="ltr"><<a href="mailto:simonpj@microsoft.com" target="_blank">simonpj@microsoft.com</a>></span> wrote:<br><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-family:"Calibri","sans-serif"">Carter<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">That smells wrong to me. These flags have a very carefully defined meaning; see<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""> Note [PrimOp can_fail and has_side_effects]<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">in PrimOp.lhs<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">If you say it has side effects when it doesn’t, you’ll confuse your successor reading the code in five years time.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Better to find out what is going on and why. Might you do that? What transformation invalidates the let/app invariant? Make a small test case, use –dverbose-core2core
–ddump-occur-anal –ddump-inlinings. I would far rather that than install a land-mine in the code.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Simon<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Carter Schonwald [mailto:<a href="mailto:carter.schonwald@gmail.com" target="_blank">carter.schonwald@gmail.com</a>]
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<b>Sent:</b> 24 November 2014 00:54<br>
<b>To:</b> Edward Kmett<br>
<b>Cc:</b> <a href="mailto:ghc-devs@haskell.org" target="_blank">ghc-devs@haskell.org</a>; Simon Peyton Jones; Joachim Breitner<br>
<b>Subject:</b> Re: let app invariant failure, HALP Re: how to write a ghc primop that acts on an unevaluated argument?<u></u><u></u></span></p>
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woot, solved it, at least in a way thats OK for now.<u></u><u></u></p>
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<u></u> <u></u></p>
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if I mark the prefetchValue operations as has_side_effects=True, the core lint failure goes away! I'm not sure if thats the right semantics in the long term, but it does give me a simple way to make sure it works safely for 7.10<u></u><u></u></p>
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<u></u> <u></u></p>
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pardon all the noise <u></u><u></u></p>
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-Carter <u></u><u></u></p>
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<u></u> <u></u></p>
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On Sun, Nov 23, 2014 at 4:26 PM, Carter Schonwald <<a href="mailto:carter.schonwald@gmail.com" target="_blank">carter.schonwald@gmail.com</a>> wrote:<u></u><u></u></p>
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ok, i'm getting a let/app invariant failure when i build my test case with O1 or O2 but not without<u></u><u></u></p>
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<u></u> <u></u></p>
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<a href="http://lpaste.net/114881" target="_blank">http://lpaste.net/114881</a><u></u><u></u></p>
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<u></u> <u></u></p>
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any help would be appreciated on how to address that<u></u><u></u></p>
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<u></u> <u></u></p>
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On Sun, Nov 23, 2014 at 4:13 PM, Carter Schonwald <<a href="mailto:carter.schonwald@gmail.com" target="_blank">carter.schonwald@gmail.com</a>> wrote:<u></u><u></u></p>
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yup, i have that!<u></u><u></u></p>
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<u></u> <u></u></p>
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wrapFetch prefetchValue0# (error "this shouldn't get evaluated")<u></u><u></u></p>
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<u></u> <u></u></p>
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in the test suite! <u></u><u></u></p>
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<u></u> <u></u></p>
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in contrast <u></u><u></u></p>
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wrapFetch prefetchValue0# $! (error "this shouldn't get evaluated") does explode<u></u><u></u></p>
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shall I add a "should fail" test with the latter? (it doesn't seem worthwhile)<u></u><u></u></p>
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<u></u> <u></u></p>
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On Sun, Nov 23, 2014 at 3:53 PM, Edward Kmett <<a href="mailto:ekmett@gmail.com" target="_blank">ekmett@gmail.com</a>> wrote:<u></u><u></u></p>
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Maybe test for laziness in the argument by just putting something in that goes boom when forced, e.g. 'undefined'?<u></u><u></u></p>
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On Sun, Nov 23, 2014 at 2:04 PM, Carter Schonwald <<a href="mailto:carter.schonwald@gmail.com" target="_blank">carter.schonwald@gmail.com</a>> wrote:<u></u><u></u></p>
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Hey All,<u></u><u></u></p>
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as part of trying to get some fixups for how prefetch works into 7.10,<u></u><u></u></p>
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i'm adding a "prefetchValue" primop that prefetchs the memory location of a lifted heap value <u></u><u></u></p>
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<u></u> <u></u></p>
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namely <u></u><u></u></p>
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<u></u> <u></u></p>
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several operations of the following form<u></u><u></u></p>
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primop PrefetchValueOp1 "prefetchValue1#" GenPrimOp<u></u><u></u></p>
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a -> State# s -> State# s<u></u><u></u></p>
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with strictness = { \ _arity -> mkClosedStrictSig [botDmd, topDmd] topRes }<u></u><u></u></p>
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I'd like some feedback on the strictness information design by someone who's familiar with how that piece of GHC. the idea being that prefetchValue is lazy in its polymorphic argument (it doesn't force it, it just does a prefetch on the heap location, which
may or may not be evaluated).<u></u><u></u></p>
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<u></u> <u></u></p>
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<a href="https://phabricator.haskell.org/D350" target="_blank">https://phabricator.haskell.org/D350</a><u></u><u></u></p>
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<u></u> <u></u></p>
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is the code in question. And i *believe* i'm testing for being lazy in that argument correctly.<u></u><u></u></p>
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<u></u> <u></u></p>
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thoughts?<u></u><u></u></p>
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<u></u> <u></u></p>
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many thanks!<u></u><u></u></p>
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<span style="color:#888888">-Carter<u></u><u></u></span></p>
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