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<h3>
Andrew Martin pushed to branch wip/boxed-rep
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/185a01b0a2522b8197710e339b21179267d4245a">185a01b0</a></strong>
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<span>by Andrew Martin</span>
<i>at 2020-12-04T08:21:29-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] Update some notes
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<h4>3 changed files:</h4>
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<a href="#8a5cd068459120cddf3814e7b9e02003b87647ba">
compiler/GHC/Builtin/Types/Prim.hs
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<li class="file-stats">
<a href="#804ef387cfc0e82b5b58b0764a766737229ac624">
compiler/GHC/Types/RepType.hs
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<a href="#e1dc7d84d8f2c952dba37b15142001f1d7952318">
libraries/ghc-prim/GHC/Types.hs
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<h4>Changes:</h4>
<li id="8a5cd068459120cddf3814e7b9e02003b87647ba">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/185a01b0a2522b8197710e339b21179267d4245a#8a5cd068459120cddf3814e7b9e02003b87647ba"><strong>compiler/GHC/Builtin/Types/Prim.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -451,26 +451,28 @@ Note [TYPE and RuntimeRep]</td>
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451
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">All types that classify values have a kind of the form (TYPE rr), where</span></span>
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452
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452
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<pre style="margin: 0;"> <span id="LC452" class="line" lang="haskell"></span>
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453
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data RuntimeRep -- Defined in ghc-prim:GHC.Types</span></span>
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454
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<pre style="margin: 0;">-<span id="LC454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = LiftedRep</span></span>
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455
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<pre style="margin: 0;">-<span id="LC455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | UnliftedRep</span></span>
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = BoxedRep Levity</span></span>
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456
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<pre style="margin: 0;"> <span id="LC455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | IntRep</span></span>
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457
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456
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | FloatRep</span></span>
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458
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> .. etc ..</span></span>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Levity = Lifted | Unlifted</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rr :: RuntimeRep</span></span>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TYPE :: RuntimeRep -> TYPE 'LiftedRep -- Built in</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So for example:</span></span>
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<pre style="margin: 0;">-<span id="LC465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Int :: TYPE <span class="idiff left right">'LiftedRep</span></span></span>
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<pre style="margin: 0;">-<span id="LC466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Array# Int :: TYPE <span class="idiff left right">'UnliftedRep</span></span></span>
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<pre style="margin: 0;">+<span id="LC466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Int :: TYPE <span class="idiff left right">('BoxedRep 'Lifted)</span></span></span>
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<pre style="margin: 0;">+<span id="LC467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Array# Int :: TYPE <span class="idiff left right">('BoxedRep 'Unlifted)</span></span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Int# :: TYPE 'IntRep</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Float# :: TYPE 'FloatRep</span></span>
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<pre style="margin: 0;">-<span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Maybe :: TYPE <span class="idiff left right">'LiftedRep -> TYPE 'LiftedRep</span></span></span>
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<pre style="margin: 0;">+<span id="LC470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Maybe :: TYPE <span class="idiff left right">('BoxedRep 'Lifted) -> TYPE ('BoxedRep 'Lifted)</span></span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (# , #) :: TYPE r1 -> TYPE r2 -> TYPE (TupleRep [r1, r2])</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We abbreviate '*' specially:</span></span>
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<pre style="margin: 0;">-<span id="LC473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type * = TYPE 'LiftedRep</span></span>
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<pre style="margin: 0;">+<span id="LC474" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type LiftedRep = 'BoxedRep 'Lifted</span></span>
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<pre style="margin: 0;">+<span id="LC475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type * = TYPE LiftedRep</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The 'rr' parameter tells us how the value is represented at runtime.</span></span>
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<pre style="margin: 0;"> <span id="LC478" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -361,10 +361,11 @@ but RuntimeRep has some extra cases:</td>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data RuntimeRep = VecRep VecCount VecElem -- ^ a SIMD vector type</span></span>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | TupleRep [RuntimeRep] -- ^ An unboxed tuple of the given reps</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | SumRep [RuntimeRep] -- ^ An unboxed sum of the given reps</span></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | LiftedRep -- ^ lifted; represented by a pointer</span></span>
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | UnliftedRep -- ^ unlifted; represented by a pointer</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | BoxedRep Levity -- ^ boxed; represented by a pointer</span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | IntRep -- ^ signed, word-sized value</span></span>
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<pre style="margin: 0;"> <span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...etc...</span></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data Levity = Lifted</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Unlifted</span></span>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's all in 1-1 correspondence with PrimRep except for TupleRep and SumRep,</span></span>
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which describe unboxed products and sums respectively. RuntimeRep is defined</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -374,6 +375,13 @@ program, so that every variable has a type that has a PrimRep. For</td>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, unarisation transforms our utup function above, to take two Int</span></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arguments instead of one (# Int, Int #) argument.</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also, note that boxed types are represented slightly differently in RuntimeRep</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and PrimRep. PrimRep just has the nullary LiftedRep and UnliftedRep data</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constructors. RuntimeRep has a BoxedRep data constructor, which accepts a</span></span>
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Levity. The subtle distinction is that since BoxedRep can accept a variable</span></span>
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument, RuntimeRep can talk about levity polymorphic types. PrimRep, by</span></span>
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">contrast, cannot.</span></span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Getting from RuntimeRep to PrimRep] and Note [VoidRep].</span></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [VoidRep]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/185a01b0a2522b8197710e339b21179267d4245a#e1dc7d84d8f2c952dba37b15142001f1d7952318"><strong>libraries/ghc-prim/GHC/Types.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -448,6 +448,7 @@ data RuntimeRep = VecRep VecCount VecElem -- ^ a SIMD vector type</td>
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<pre style="margin: 0;"> <span id="LC448" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- RuntimeRep is intimately tied to TyCon.RuntimeRep (in GHC proper). See</span></span>
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<pre style="margin: 0;"> <span id="LC449" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [RuntimeRep and PrimRep] in RepType.</span></span>
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<pre style="margin: 0;"> <span id="LC450" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [Wiring in RuntimeRep] in GHC.Builtin.Types</span></span>
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<pre style="margin: 0;">+<span id="LC451" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [TYPE and RuntimeRep] in GHC.Builtin.Type.Prim</span></span>
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<pre style="margin: 0;"> <span id="LC452" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="haskell"><span class="cd">-- | Length of a SIMD vector type</span></span>
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<pre style="margin: 0;"> <span id="LC454" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">VecCount</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Vec2</span></span>
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