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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
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/1c2aa0e32e96f23caf12e6f19108401c5a6afc8f">1c2aa0e3</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-10T17:56:29+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve performance
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<h4>2 changed files:</h4>
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<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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compiler/GHC/Tc/Solver/Monad.hs
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<h4>Changes:</h4>
<li id="81707f1fe21087531cefd70879aa09c2be5c1d22">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c2aa0e32e96f23caf12e6f19108401c5a6afc8f#81707f1fe21087531cefd70879aa09c2be5c1d22"><strong>compiler/GHC/Tc/Solver/Flatten.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">@@ -364,18 +364,17 @@ faster. This doesn't seem quite worth it, yet.</td>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"></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;">Note [flatten_exact_fam_app_fully performance]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">The refactor of GRefl seems to cause performance trouble for T9872x:</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;">the allocation of flatten_exact_fam_app_fully_performance</span></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">increased. See note [Generalized reflexive coercion] in</span></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;">GHC.Core.TyCo.Rep for more information about GRefl and #15192 for the</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;">current state.</span></span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The explicit pattern match in homogenise_result helps with T9872a, b, c.</span></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Still, it increases the expected allocation of T9872d by ~2%.</span></span>
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TODO: a step-by-step replay of the refactor to analyze the performance.</span></span>
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"></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;">Once we've got a flat rhs, we extend the flat-cache to record</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;">the result. Doing so can save lots of work when the same redex shows up more</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">than once. Note that we record the link from the redex all the way to its</span></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;">*final* value, not just the single step reduction. Interestingly, adding to the</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;">flat-cache for the first reduction *doubles* the allocations</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for the T9872a test. However, using the flat-cache in</span></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the later reduction is a similar gain. I (Richard E) don't currently</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(Dec '14 nor Nov '20) have any knowledge as to *why* these facts are true.</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Perhaps the first use of the flat-cache doesn't add much, because we didn't</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;">need to reduce in the arguments (and instance lookup is similar to cache</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lookup).</span></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;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE flatten_args_tc #-}</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">@@ -766,7 +765,7 @@ flatten_fam_app tc tys -- Can be over-saturated</td>
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">flatten_app_ty_args</span> <span class="n" style="color: #333;">xi1</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">tys_rest</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the [TcType] exactly saturate the TyCon</span></span>
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<pre style="margin: 0;">-<span id="LC769" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See <span class="idiff left right">n</span>ote [flatten_exact_fam_app_fully performance]</span></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See <span class="idiff left right">N</span>ote [flatten_exact_fam_app_fully performance]</span></span>
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_exact_fam_app_fully</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_exact_fam_app_fully</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkStackDepth</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</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">@@ -774,14 +773,15 @@ flatten_exact_fam_app_fully tc tys</td>
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Step 1. Try to reduce without reducing arguments first.</span></span>
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">result1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">try_to_reduce</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">result1</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC777" class="line" lang="haskell"> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">finish</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xi2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bumpDepth</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">xi</span></span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">xi2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">}</span></span>
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778
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span></span>
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779
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"></span>
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780
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- That didn't work. So reduce the arguments.</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xis</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten_args_tc</span> <span class="n" style="color: #333;">tc</span> <span class="p">(</span><span class="n" style="color: #333;">repeat</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- kind_co :: tcTypeKind(F xis) ~N tcTypeKind(F tys)</span></span>
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783
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"></span>
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784
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eq_rel</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqRel</span></span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqRel</span></span>
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<pre style="margin: 0;"> <span id="LC785" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span></span>
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"> <span class="n" style="color: #333;">args_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConAppCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">cos</span></span>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- args_co :: F xis ~r F tys</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">@@ -791,14 +791,7 @@ flatten_exact_fam_app_fully tc tys</td>
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- assume co :: xi ~r F xis, co is homogeneous</span></span>
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<pre style="margin: 0;"> <span id="LC792" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then xi' :: tcTypeKind(F tys)</span></span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and co' :: xi' ~r F tys, which is homogeneous</span></span>
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="haskell"> <span class="n" style="color: #333;">homogenise</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">casted_xi</span><span class="p">,</span> <span class="n" style="color: #333;">final_co</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC795" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC796" class="line" lang="haskell"> <span class="n" style="color: #333;">casted_xi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xi</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kind_co</span></span>
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- casted_xi :: tcTypeKind(F tys)</span></span>
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="haskell"> <span class="n" style="color: #333;">homo_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcGReflLeftCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">kind_co</span></span>
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- homo_co :: casted_xi ~r xi</span></span>
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"> <span class="n" style="color: #333;">final_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">homo_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">args_co</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"> <span class="n" style="color: #333;">homogenise</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">homogenise_result</span> <span class="n" style="color: #333;">xi</span> <span class="p">(</span><span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">args_co</span><span class="p">)</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">kind_co</span></span>
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795
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">result2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lookupFamAppInert</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getFlavour</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">@@ -807,7 +800,8 @@ flatten_exact_fam_app_fully tc tys</td>
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co :: F xis ~ir xi</span></span>
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808
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801
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"></span>
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809
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802
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fr</span> <span class="p">`</span><span class="n" style="color: #333;">eqCanRewriteFR</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">flavour</span><span class="p">,</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC810" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceFlat</span> <span class="s" style="color: #d14;">"flatten/flat-cache hit"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xis</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceFlat</span> <span class="s" style="color: #d14;">"rewrite family application with inert"</span></span>
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804
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xis</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span></span>
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805
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">finish</span> <span class="p">(</span><span class="n" style="color: #333;">homogenise</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">downgraded_co</span><span class="p">)</span> <span class="p">}</span></span>
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812
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806
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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807
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_role</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">inert_eq_rel</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="832" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="826" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -832,7 +826,10 @@ flatten_exact_fam_app_fully tc tys</td>
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832
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826
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fully_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co</span></span>
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833
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827
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqRel</span></span>
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834
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828
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getFlavour</span></span>
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835
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;">/=</span> <span class="kt" style="color: #458; font-weight: 600;">Derived</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- the cache only wants Nominal eqs</span></span>
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829
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;">/=</span> <span class="kt" style="color: #458; font-weight: 600;">Derived</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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830
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the cache only wants Nominal eqs</span></span>
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and Wanteds can rewrite Deriveds; the cache</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- has only Givens</span></span>
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836
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833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extendFamAppCache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</span><span class="n" style="color: #333;">final_co</span><span class="p">,</span> <span class="n" style="color: #333;">fully</span><span class="p">)</span></span>
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837
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">fully</span><span class="p">,</span> <span class="n" style="color: #333;">final_co</span><span class="p">)</span> <span class="p">}</span></span>
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838
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835
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<pre style="margin: 0;"> <span id="LC835" 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">@@ -846,210 +843,19 @@ try_to_reduce tc tys</td>
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846
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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847
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"> <span class="n" style="color: #333;">downgrade</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">))</span></span>
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848
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="n" style="color: #333;">downgrade</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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849
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<pre style="margin: 0;">-<span id="LC849" class="line" lang="haskell"> <span class="n" style="color: #333;">downgrade</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">))</span></span>
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846
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"> <span class="n" style="color: #333;">downgrade</span> <span class="n" style="color: #333;"><span class="idiff left">result</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">@</span></span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">))</span></span>
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850
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceFlat</span> <span class="s" style="color: #d14;">"Eager T.F. reduction success"</span> <span class="o" style="font-weight: 600;">$</span></span>
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851
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848
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xi</span></span>
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852
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849
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">coercionKind</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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853
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850
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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"> <span class="p">]</span></span>
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854
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<pre style="margin: 0;">-<span id="LC854" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRole</span></span>
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855
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tcDowngradeRole</span> <span class="n" style="color: #333;">role</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">))</span> <span class="p">}</span></span>
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856
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<pre style="margin: 0;">-<span id="LC856" class="line" lang="haskell"></span>
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857
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<pre style="margin: 0;">-<span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- "RAE"</span></span>
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858
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- See Note [Reduce type family applications eagerly]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="859" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
859
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- the following tcTypeKind should never be evaluated, as it's just used in</span></span>
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<td class="diff-line-num old old_line" data-linenumber="860" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
860
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- casting, and casts by refl are dropped</span></span>
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<td class="diff-line-num old old_line" data-linenumber="861" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
861
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = do { mOut <- try_to_reduce_nocache tc tys</span></span>
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<td class="diff-line-num old old_line" data-linenumber="862" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
862
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; case mOut of</span></span>
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<td class="diff-line-num old old_line" data-linenumber="863" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
863
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just out -> pure out</span></span>
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864
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nothing -> do</span></span>
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865
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { -- First, flatten the arguments</span></span>
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866
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; (xis, cos, kind_co)</span></span>
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867
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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <- setEqRel NomEq $ -- just do this once, instead of for</span></span>
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868
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- each arg</span></span>
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869
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> flatten_args_tc tc (repeat Nominal) tys</span></span>
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870
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- kind_co :: tcTypeKind(F xis) ~N tcTypeKind(F tys)</span></span>
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871
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; eq_rel <- getEqRel</span></span>
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872
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; cur_fr <- getFlavourRole</span></span>
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873
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let role = eqRelRole eq_rel</span></span>
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874
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ret_co = mkTyConAppCo role tc cos</span></span>
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875
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- ret_co :: F xis ~ F tys; might be heterogeneous</span></span>
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876
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"></span>
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877
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Now, look in the inerts and the cache</span></span>
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<td class="diff-line-num old old_line" data-linenumber="878" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
878
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; mb_ct <- liftTcS $ lookupFamApp tc xis</span></span>
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<td class="diff-line-num old old_line" data-linenumber="879" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
879
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; dflags <- getDynFlags</span></span>
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880
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; loc <- getLoc</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; case mb_ct of</span></span>
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882
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just (co, rhs_ty, inert_fr@(_, inert_eq_rel)) -- co :: F xis ~ rhs_ty</span></span>
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883
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | inert_fr `eqCanRewriteFR` cur_fr</span></span>
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884
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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- See Note [Runaway Derived rewriting]</span></span>
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885
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , let reduction_ok | (Derived, _) <- cur_fr</span></span>
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886
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = not (subGoalDepthExceeded dflags</span></span>
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887
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (bumpSubGoalDepth (ctLocDepth loc)))</span></span>
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888
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise</span></span>
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889
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<pre style="margin: 0;">-<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = True</span></span>
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890
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<pre style="margin: 0;">-<span id="LC890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , reduction_ok</span></span>
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891
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<pre style="margin: 0;">-<span id="LC891" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> -- Usable hit in the flat-cache</span></span>
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892
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<pre style="margin: 0;">-<span id="LC892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> do { traceFlat "flatten/flat-cache hit" $</span></span>
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893
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<pre style="margin: 0;">-<span id="LC893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (ppr tc <+> ppr xis $$ ppr rhs_ty)</span></span>
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894
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<pre style="margin: 0;">-<span id="LC894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; (rhs_xi, rhs_co) <- flatten_one rhs_ty</span></span>
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895
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<pre style="margin: 0;">-<span id="LC895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- There may be more work to do on the rhs:</span></span>
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896
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<pre style="margin: 0;">-<span id="LC896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- flatten it</span></span>
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897
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<pre style="margin: 0;">-<span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- rhs_co :: rhs_xi ~ rhs_ty</span></span>
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898
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<pre style="margin: 0;">-<span id="LC898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let xi = rhs_xi `mkCastTy` kind_co</span></span>
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899
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<pre style="margin: 0;">-<span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co' = mkTcCoherenceLeftCo role rhs_xi kind_co rhs_co</span></span>
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900
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<pre style="margin: 0;">-<span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `mkTransCo`</span></span>
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901
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<pre style="margin: 0;">-<span id="LC901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tcDowngradeRole role (eqRelRole inert_eq_rel)</span></span>
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902
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<pre style="margin: 0;">-<span id="LC902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (mkTcSymCo co)</span></span>
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903
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<pre style="margin: 0;">-<span id="LC903" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `mkTransCo` ret_co</span></span>
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904
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<pre style="margin: 0;">-<span id="LC904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return (xi, co')</span></span>
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905
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<pre style="margin: 0;">-<span id="LC905" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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<pre style="margin: 0;">-<span id="LC906" class="line" lang="haskell"></span>
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907
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<pre style="margin: 0;">-<span id="LC907" class="line" lang="haskell"></span>
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908
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<pre style="margin: 0;">-<span id="LC908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Try to reduce the family application right now</span></span>
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909
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<pre style="margin: 0;">-<span id="LC909" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- See Note [Reduce type family applications eagerly]</span></span>
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910
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<pre style="margin: 0;">-<span id="LC910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> _ -> do { mOut <- try_to_reduce tc</span></span>
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911
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<pre style="margin: 0;">-<span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> xis</span></span>
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912
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<pre style="margin: 0;">-<span id="LC912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kind_co</span></span>
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913
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (`mkTransCo` ret_co)</span></span>
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914
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; case mOut of</span></span>
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915
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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just out -> pure out</span></span>
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916
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<pre style="margin: 0;">-<span id="LC916" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nothing -> do</span></span>
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917
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { traceFlat "flatten/flat-cache miss" $</span></span>
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918
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<pre style="margin: 0;">-<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ppr tc <+> ppr xis</span></span>
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919
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<pre style="margin: 0;">-<span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let uncasted_ty = mkTyConApp tc xis</span></span>
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920
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> casted_ty = uncasted_ty `mkCastTy` kind_co</span></span>
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921
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<pre style="margin: 0;">-<span id="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> final_co = mkTcCoherenceLeftCo role uncasted_ty</span></span>
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922
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<pre style="margin: 0;">-<span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kind_co ret_co</span></span>
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923
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<pre style="margin: 0;">-<span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return ( casted_ty, final_co )</span></span>
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924
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<pre style="margin: 0;">-<span id="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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925
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<pre style="margin: 0;">-<span id="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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926
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<pre style="margin: 0;">-<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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927
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<pre style="margin: 0;">-<span id="LC927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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928
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<pre style="margin: 0;">-<span id="LC928" class="line" lang="haskell"></span>
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929
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<pre style="margin: 0;">-<span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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930
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<pre style="margin: 0;">-<span id="LC930" class="line" lang="haskell"></span>
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931
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<pre style="margin: 0;">-<span id="LC931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- try_to_reduce and try_to_reduce_nocache (below) could be unified into</span></span>
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932
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<pre style="margin: 0;">-<span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- a more general definition, but it was observed that separating them</span></span>
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933
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- gives better performance (lower allocation numbers in T9872x).</span></span>
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934
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<pre style="margin: 0;">-<span id="LC934" class="line" lang="haskell"></span>
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935
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<pre style="margin: 0;">-<span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> try_to_reduce :: TyCon -- F, family tycon</span></span>
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936
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<pre style="margin: 0;">-<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> [Type] -- args, not necessarily flattened</span></span>
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937
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<pre style="margin: 0;">-<span id="LC937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> CoercionN -- kind_co :: tcTypeKind(F args) ~N</span></span>
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938
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- tcTypeKind(F orig_args)</span></span>
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939
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<pre style="margin: 0;">-<span id="LC939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- where</span></span>
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940
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<pre style="margin: 0;">-<span id="LC940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- orig_args is what was passed to the outer</span></span>
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941
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- function</span></span>
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942
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> ( Coercion -- :: (xi |> kind_co) ~ F args</span></span>
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943
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<pre style="margin: 0;">-<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> Coercion ) -- what to return from outer function</span></span>
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944
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<pre style="margin: 0;">-<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> FlatM (Maybe (Xi, Coercion))</span></span>
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945
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> try_to_reduce tc tys kind_co update_co</span></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = do { checkStackDepth (mkTyConApp tc tys)</span></span>
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947
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; mb_match <- liftTcS $ matchFam tc tys</span></span>
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948
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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; case mb_match of</span></span>
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949
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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- NB: norm_co will always be homogeneous. All type families</span></span>
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950
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<pre style="margin: 0;">-<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- are homogeneous.</span></span>
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951
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<pre style="margin: 0;">-<span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just (norm_co, norm_ty)</span></span>
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952
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> do { traceFlat "Eager T.F. reduction success" $</span></span>
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953
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> vcat [ ppr tc, ppr tys, ppr norm_ty</span></span>
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954
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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , ppr norm_co <+> dcolon</span></span>
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955
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<pre style="margin: 0;">-<span id="LC955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <+> ppr (coercionKind norm_co)</span></span>
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956
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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ]</span></span>
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957
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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; (xi, final_co) <- bumpDepth $ flatten_one norm_ty</span></span>
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<td class="diff-line-num old old_line" data-linenumber="958" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
958
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; eq_rel <- getEqRel</span></span>
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959
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let co = maybeTcSubCo eq_rel norm_co</span></span>
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<td class="diff-line-num old old_line" data-linenumber="960" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
960
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `mkTransCo` mkSymCo final_co</span></span>
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961
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<pre style="margin: 0;">-<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- NB: only extend cache with nominal equalities</span></span>
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<td class="diff-line-num old old_line" data-linenumber="962" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
962
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<pre style="margin: 0;">-<span id="LC962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; when (eq_rel == NomEq) $</span></span>
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<td class="diff-line-num old old_line" data-linenumber="963" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
963
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<pre style="margin: 0;">-<span id="LC963" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> liftTcS $ extendFamAppCache tc tys (co, xi)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="964" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
964
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let role = eqRelRole eq_rel</span></span>
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965
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<pre style="margin: 0;">-<span id="LC965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> xi' = xi `mkCastTy` kind_co</span></span>
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966
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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co' = update_co $</span></span>
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967
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<pre style="margin: 0;">-<span id="LC967" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mkTcCoherenceLeftCo role xi kind_co (mkSymCo co)</span></span>
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968
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<pre style="margin: 0;">-<span id="LC968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return $ Just (xi', co') }</span></span>
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969
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<pre style="margin: 0;">-<span id="LC969" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nothing -> pure Nothing }</span></span>
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970
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<pre style="margin: 0;">-<span id="LC970" class="line" lang="haskell"></span>
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971
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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> try_to_reduce_nocache :: TyCon -- F, family tycon</span></span>
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<td class="diff-line-num old old_line" data-linenumber="972" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
972
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> [Type] -- args, not necessarily flattened</span></span>
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<td class="diff-line-num old old_line" data-linenumber="973" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
973
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> FlatM (Maybe (Xi, Coercion))</span></span>
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974
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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> try_to_reduce_nocache tc tys</span></span>
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975
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = do { checkStackDepth (mkTyConApp tc tys)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="976" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
976
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<pre style="margin: 0;">-<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; mb_match <- liftTcS $ matchFam tc tys</span></span>
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<td class="diff-line-num old old_line" data-linenumber="977" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; case mb_match of</span></span>
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978
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- NB: norm_co will always be homogeneous. All type families</span></span>
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979
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<pre style="margin: 0;">-<span id="LC979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- are homogeneous.</span></span>
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980
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just (norm_co, norm_ty)</span></span>
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981
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<pre style="margin: 0;">-<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> do { (xi, final_co) <- bumpDepth $ flatten_one norm_ty</span></span>
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982
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<pre style="margin: 0;">-<span id="LC982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; eq_rel <- getEqRel</span></span>
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983
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<pre style="margin: 0;">-<span id="LC983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let co = mkSymCo (maybeTcSubCo eq_rel norm_co</span></span>
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984
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `mkTransCo` mkSymCo final_co)</span></span>
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985
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<pre style="margin: 0;">-<span id="LC985" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return $ Just (xi, co) }</span></span>
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986
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<pre style="margin: 0;">-<span id="LC986" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nothing -> pure Nothing }</span></span>
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987
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<pre style="margin: 0;">-<span id="LC987" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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988
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<pre style="margin: 0;">-<span id="LC988" class="line" lang="haskell"></span>
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989
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<pre style="margin: 0;">-<span id="LC989" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Reduce type family applications eagerly]</span></span>
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990
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<pre style="margin: 0;">-<span id="LC990" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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991
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<pre style="margin: 0;">-<span id="LC991" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": Update Note.</span></span>
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992
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"></span>
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993
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<pre style="margin: 0;">-<span id="LC993" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we come across a type-family application like (Append (Cons x Nil) t),</span></span>
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994
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<pre style="margin: 0;">-<span id="LC994" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then, rather than flattening to a skolem etc, we may as well just reduce</span></span>
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995
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<pre style="margin: 0;">-<span id="LC995" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it on the spot to (Cons x t). This saves a lot of intermediate steps.</span></span>
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996
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Examples that are helped are tests T9872, and T5321Fun.</span></span>
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997
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"></span>
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998
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<pre style="margin: 0;">-<span id="LC998" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Performance testing indicates that it's best to try this *twice*, once</span></span>
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999
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<pre style="margin: 0;">-<span id="LC999" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">before flattening arguments and once after flattening arguments.</span></span>
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1000
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Adding the extra reduction attempt before flattening arguments cut</span></span>
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1001
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<pre style="margin: 0;">-<span id="LC1001" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the allocation amounts for the T9872{a,b,c} tests by half.</span></span>
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1002
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"></span>
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1003
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<pre style="margin: 0;">-<span id="LC1003" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">An example of where the early reduction appears helpful:</span></span>
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1004
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<pre style="margin: 0;">-<span id="LC1004" class="line" lang="haskell"></span>
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1005
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family Last x where</span></span>
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1006
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<pre style="margin: 0;">-<span id="LC1006" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Last '[x] = x</span></span>
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1007
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Last (h ': t) = Last t</span></span>
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1008
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<pre style="margin: 0;">-<span id="LC1008" class="line" lang="haskell"></span>
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1009
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<pre style="margin: 0;">-<span id="LC1009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> workitem: (x ~ Last '[1,2,3,4,5,6])</span></span>
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1010
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<pre style="margin: 0;">-<span id="LC1010" class="line" lang="haskell"></span>
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1011
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<pre style="margin: 0;">-<span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Flattening the argument never gets us anywhere, but trying to flatten</span></span>
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1012
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<pre style="margin: 0;">-<span id="LC1012" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it at every step is quadratic in the length of the list. Reducing more</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">eagerly makes simplifying the right-hand type linear in its length.</span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"></span>
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1015
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<pre style="margin: 0;">-<span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Testing also indicated that the early reduction should *not* use the</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flat-cache, but that the later reduction *should*. (Although the</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">effect was not large.) Hence the Bool argument to try_to_reduce. To</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">me (SLPJ) this seems odd; I get that eager reduction usually succeeds;</span></span>
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1019
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and if don't use the cache for eager reduction, we will miss most of</span></span>
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1020
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<pre style="margin: 0;">-<span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the opportunities for using it at all. More exploration would be good</span></span>
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1021
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<pre style="margin: 0;">-<span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">here.</span></span>
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1022
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<pre style="margin: 0;">-<span id="LC1022" class="line" lang="haskell"></span>
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1023
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">At the end, once we've got a flat rhs, we extend the flatten-cache to record</span></span>
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1024
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<pre style="margin: 0;">-<span id="LC1024" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the result. Doing so can save lots of work when the same redex shows up more</span></span>
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1025
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<pre style="margin: 0;">-<span id="LC1025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">than once. Note that we record the link from the redex all the way to its</span></span>
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1026
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<pre style="margin: 0;">-<span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*final* value, not just the single step reduction. Interestingly, using the</span></span>
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1027
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<pre style="margin: 0;">-<span id="LC1027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flat-cache for the first reduction resulted in an increase in allocations</span></span>
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1028
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<pre style="margin: 0;">-<span id="LC1028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of about 3% for the four T9872x tests. However, using the flat-cache in</span></span>
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1029
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<pre style="margin: 0;">-<span id="LC1029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the later reduction is a similar gain. I (Richard E) don't currently (Dec '14)</span></span>
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1030
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have any knowledge as to *why* these facts are true.</span></span>
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1031
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<pre style="margin: 0;">-<span id="LC1031" class="line" lang="haskell"></span>
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1032
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<pre style="margin: 0;">-<span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Runaway Derived rewriting]</span></span>
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1033
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<pre style="margin: 0;">-<span id="LC1033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1034
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<pre style="margin: 0;">-<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": Remove. We do occurs-checking now.</span></span>
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1035
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<pre style="margin: 0;">-<span id="LC1035" class="line" lang="haskell"></span>
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1036
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<pre style="margin: 0;">-<span id="LC1036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [WD] F a ~ T (F a)</span></span>
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1038
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We *don't* want to fall into a hole using that to rewrite a Derived</span></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [D] F a ~ Int</span></span>
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1040
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<pre style="margin: 0;">-<span id="LC1040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because that produces an unhelpful error about a reduction stack overflow.</span></span>
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1041
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<pre style="margin: 0;">-<span id="LC1041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead, when we've reached the reduction stack limit on a Derived, just stop.</span></span>
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1042
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<pre style="margin: 0;">-<span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Either the program will be accepted if all the Wanteds are solved (good),</span></span>
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1043
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<pre style="margin: 0;">-<span id="LC1043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or a Wanted will not be solved, and will be reported (also good).</span></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" class="line" lang="haskell"></span>
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1045
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<pre style="margin: 0;">-<span id="LC1045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is a tiny chance that continuing to try to reduce the Derived would</span></span>
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1046
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<pre style="margin: 0;">-<span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">yield fruit, and there is no way for the user to know this is the case</span></span>
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1047
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<pre style="margin: 0;">-<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(or to increase the reduction stack limit). But I see no easy way of</span></span>
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1048
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<pre style="margin: 0;">-<span id="LC1048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">communicating this. Since Deriveds are likely going to be short-lived</span></span>
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1049
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<td class="diff-line-num new_line old" data-linenumber="851" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">at this point, it's not worth thinking about further.</span></span>
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1050
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<pre style="margin: 0;">-<span id="LC1050" class="line" lang="haskell"></span>
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1051
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<pre style="margin: 0;">-<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This arose in typecheck/should_fail/T13320.</span></span>
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqRel</span></span>
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- manually doing it this way avoids allocation in the vastly</span></span>
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- common NomEq case</span></span>
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">result</span></span>
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ReprEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">mkSubCo</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">))</span> <span class="p">}</span></span>
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Flattening a type variable</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c2aa0e32e96f23caf12e6f19108401c5a6afc8f#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.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">@@ -406,6 +406,9 @@ data InertSet</td>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_famapp_cache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If F tys :-> (co, rhs, flav),</span></span>
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408
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408
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then co :: rhs ~ F tys</span></span>
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409
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all evidence is from instances or Givens</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (We have no way of "kicking out" from the cache, so putting</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wanteds here means we can end up solving a Wanted with itself. Bad)</span></span>
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409
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412
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Some entries in the cache might have arisen from Wanteds, and</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so this should be used only for rewriting Wanteds.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2385" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2388" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2385,11 +2388,15 @@ lookupFamAppInert fam_tc tys</td>
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2385
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2388
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<pre style="margin: 0;"> <span id="LC2388" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC2389" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2390" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFamAppCache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC2388" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFamAppCache</span> <span class="kt" style="color: #458; font-weight: 600;">Given</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC2389" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the famapp_cache contains some wanteds. Not appropriate to rewrite a Given.</span></span>
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<pre style="margin: 0;"> <span id="LC2391" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFamAppCache</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
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2391
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2392
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<pre style="margin: 0;"> <span id="LC2392" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_famapp_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">famapp_cache</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcSInerts</span></span>
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<pre style="margin: 0;">-<span id="LC2392" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">famapp_cache</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="p">}</span></span>
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2393
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<pre style="margin: 0;">+<span id="LC2393" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">famapp_cache</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2394
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<pre style="margin: 0;">+<span id="LC2394" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span></span>
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2395
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<pre style="margin: 0;">+<span id="LC2395" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"famapp_cache hit"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2396" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC2397" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span> <span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC2398" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">result</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2399" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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2393
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2400
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<pre style="margin: 0;"> <span id="LC2400" class="line" lang="haskell"></span>
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2394
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2401
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<pre style="margin: 0;"> <span id="LC2401" class="line" lang="haskell"><span class="n" style="color: #333;">lookupInInerts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span><span class="p">)</span></span>
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2395
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2402
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<pre style="margin: 0;"> <span id="LC2402" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Is this exact predicate type cached in the solved or canonicals of the InertSet?</span></span>
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