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<h3>
Ben Gamari pushed to branch wip/T18296
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/62c35d0dab86b3e4f9748a45d3f275eedefa23e7">62c35d0d</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-06-04T23:11:15-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">OccurAnal: Avoid exponential behavior due to where clauses
Previously the `Var` case of `occAnalApp` could in some cases (namely
in the case of `runRW#` applications) call `occAnalRhs` two. In the case
of nested `runRW#`s this results in exponential complexity. In some
cases the compilation time that resulted would be very long indeed
(see #18296).
Fixes #18296.
Metric Decrease:
T9961
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<h4>1 changed file:</h4>
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<a href="#bac3d5159a5688007de3aa3f5c4e50569677b347">
compiler/GHC/Core/Opt/OccurAnal.hs
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<h4>Changes:</h4>
<li id="bac3d5159a5688007de3aa3f5c4e50569677b347">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62c35d0dab86b3e4f9748a45d3f275eedefa23e7#bac3d5159a5688007de3aa3f5c4e50569677b347"><strong>compiler/GHC/Core/Opt/OccurAnal.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">@@ -1568,16 +1568,17 @@ occAnalRhs :: OccEnv -> Maybe JoinArity</td>
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<pre style="margin: 0;"> <span id="LC1568" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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<pre style="margin: 0;"> <span id="LC1569" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC1571" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">occAnalLamOrRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="p">(</span><span class="n" style="color: #333;">markJoinOneShots</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span> <span class="n" style="color: #333;">body'</span></span>
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a /non-recursive/ join point we can mark all</span></span>
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<pre style="margin: 0;">+<span id="LC1574" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- its join-lambda as one-shot; and it's a good idea to do so</span></span>
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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1576" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Final adjustment</span></span>
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<pre style="margin: 0;">+<span id="LC1577" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="n" style="color: #333;">bndrs'</span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;">+<span id="LC1578" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1579" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1580" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1581" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectBinders</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC1574" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_usage</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalLamOrRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;">-<span id="LC1575" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="p">(</span><span class="n" style="color: #333;">markJoinOneShots</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span> <span class="n" style="color: #333;">body'</span></span>
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<pre style="margin: 0;">-<span id="LC1576" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a /non-recursive/ join point we can mark all</span></span>
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<pre style="margin: 0;">-<span id="LC1577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- its join-lambda as one-shot; and it's a good idea to do so</span></span>
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<pre style="margin: 0;">-<span id="LC1578" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1579" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Final adjustment</span></span>
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<pre style="margin: 0;">-<span id="LC1580" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="n" style="color: #333;">bndrs'</span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;"> <span id="LC1582" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1583" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span></span>
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<pre style="margin: 0;"> <span id="LC1584" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">JoinArity</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join points and unfoldings/rules]</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">@@ -1885,12 +1886,18 @@ occAnalApp :: OccEnv</td>
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<pre style="margin: 0;"> <span id="LC1886" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalApp</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">ticks</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1887" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Account for join arity of runRW# continuation</span></span>
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<pre style="margin: 0;"> <span id="LC1888" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Simplification of runRW#]</span></span>
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<pre style="margin: 0;">+<span id="LC1889" 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="LC1890" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Do not be tempted to make the next (Var fun, args, tick)</span></span>
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<pre style="margin: 0;">+<span id="LC1891" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equation into an 'otherwise' clause for this equation</span></span>
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<pre style="margin: 0;">+<span id="LC1892" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The former has a bang-pattern to occ-anal the args, and</span></span>
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<pre style="margin: 0;">+<span id="LC1893" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we don't want to occ-anal them twice in the runRW# case!</span></span>
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<pre style="margin: 0;">+<span id="LC1894" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This caused #18296</span></span>
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<pre style="margin: 0;"> <span id="LC1895" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fun</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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<pre style="margin: 0;"> <span id="LC1896" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">arg</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC1897" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">mkTicks</span> <span class="n" style="color: #333;">ticks</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkApps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"></span>
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1893
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<pre style="margin: 0;">-<span id="LC1893" class="line" lang="haskell"><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">otherwise</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1900" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1900
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<pre style="margin: 0;">+<span id="LC1900" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">occAnalApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Var</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ticks</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1894
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1901
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<pre style="margin: 0;"> <span id="LC1901" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">all_uds</span><span class="p">,</span> <span class="n" style="color: #333;">mkTicks</span> <span class="n" style="color: #333;">ticks</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkApps</span> <span class="n" style="color: #333;">fun'</span> <span class="n" style="color: #333;">args'</span><span class="p">)</span></span>
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1895
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1896
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">fun'</span><span class="p">,</span> <span class="n" style="color: #333;">fun_id'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">occ_bs_env</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">fun</span></span>
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