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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a51b2ab7433c06bddca9699b0dfd8ab1d11879b">8a51b2ab</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-08-13T21:09:15-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make IOEnv monad one-shot (#18202)
On CI (x86_64-linux-deb9-hadrian, compile_time/bytes_allocated):
T10421 -1.8% (threshold: +/- 1%)
T10421a -1.7% (threshold: +/- 1%)
T12150 -4.9% (threshold: +/- 2%)
T12227 -1.6 (threshold: +/- 1%)
T12425 -1.5% (threshold: +/- 1%)
T12545 -3.8% (threshold: +/- 1%)
T12707 -3.0% (threshold: +/- 1%)
T13035 -3.0% (threshold: +/- 1%)
T14683 -10.3% (threshold: +/- 2%)
T3064 -6.9% (threshold: +/- 2%)
T4801 -4.3% (threshold: +/- 2%)
T5030 -2.6% (threshold: +/- 2%)
T5321FD -3.6% (threshold: +/- 2%)
T5321Fun -4.6% (threshold: +/- 2%)
T5631 -19.7% (threshold: +/- 2%)
T5642 -13.0% (threshold: +/- 2%)
T783 -2.7 (threshold: +/- 2%)
T9020 -11.1 (threshold: +/- 2%)
T9961 -3.4% (threshold: +/- 2%)
T1969 (compile_time/bytes_allocated) -2.2% (threshold: +/-1%)
T1969 (compile_time/max_bytes_used) +24.4% (threshold: +/-20%)
Additionally on other CIs:
haddock.Cabal -10.0% (threshold: +/- 5%)
haddock.compiler -9.5% (threshold: +/- 5%)
haddock.base (max bytes used) +24.6% (threshold: +/- 15%)
T10370 (max bytes used, i386) +18.4% (threshold: +/- 15%)
Metric Decrease:
T10421
T10421a
T12150
T12227
T12425
T12545
T12707
T13035
T14683
T3064
T4801
T5030
T5321FD
T5321Fun
T5631
T5642
T783
T9020
T9961
haddock.Cabal
haddock.compiler
Metric Decrease 'compile_time/bytes allocated':
T1969
Metric Increase 'compile_time/max_bytes_used':
T1969
T10370
haddock.base
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<h4>1 changed file:</h4>
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<a href="#c7ca3e6f50c136f058ec179bdb3fbb3cc19a7b42">
compiler/GHC/Data/IOEnv.hs
</a>
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<h4>Changes:</h4>
<li id="c7ca3e6f50c136f058ec179bdb3fbb3cc19a7b42">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a51b2ab7433c06bddca9699b0dfd8ab1d11879b#c7ca3e6f50c136f058ec179bdb3fbb3cc19a7b42"><strong>compiler/GHC/Data/IOEnv.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DeriveFunctor #-}</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DerivingVia #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PatternSynonyms #-}</span></span>
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<pre style="margin: 0;"> <span id="LC5" 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="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (c) The University of Glasgow 2002-2006</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="48" 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="49" 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">@@ -48,16 +49,25 @@ import Control.Monad.Trans.Reader</td>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad.Catch</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MonadCatch</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MonadMask</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MonadThrow</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Applicative</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Alternative</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span><span class="p">(</span> <span class="n" style="color: #333;">oneShot</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC54" 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="LC55" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Defining the monad type</span></span>
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<pre style="margin: 0;"> <span id="LC56" 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="LC57" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="p">(</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv<span class="idiff left right">'</span></span> <span class="p">(</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Functor</span><span class="p">)</span></span>
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59
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MonadThrow</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MonadCatch</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MonadMask</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MonadIO</span><span class="p">)</span> <span class="n" style="color: #333;">via</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReaderT</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span><span class="p">)</span></span>
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62
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The one-shot state monad trick] in GHC.Utils.Monad</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv'</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv'</span> <span class="p">(</span><span class="n" style="color: #333;">oneShot</span> <span class="n" style="color: #333;">m</span><span class="p">)</span></span>
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68
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# COMPLETE IOEnv #-}</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="n" style="color: #333;">unIOEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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62
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="n" style="color: #333;">unIOEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IOEnv</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"></span>
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