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<h3>

Sebastian Graf pushed to branch wip/nested-cpr-2019

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/d0b49961a17cdb07b35a4a24bb700f6f9f837e0a">d0b49961</a></strong>

<div>

<span>by Sebastian Graf</span>

<i>at 2020-05-11T21:51:42+02:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix T9291

</pre>

</li>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5397fe394009f07b0c42977af1bc1030c2592b8a">5397fe39</a></strong>

<div>

<span>by Sebastian Graf</span>

<i>at 2020-05-14T16:39:22+02:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document -fcase-binder-cpr-depth in the user's guide

</pre>

</li>

</ul>

<h4>3 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">

compiler/GHC/Driver/Session.hs

</a>

</li>

<li class="file-stats">

<a href="#2e45f2cd303dd998950a7c8042e796a5b2abd64f">

docs/users_guide/using-optimisation.rst

</a>

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<li class="file-stats">

<a href="#a486bf3cf5cbff9bebd842ee633d35800c09ce4f">

testsuite/tests/simplStg/should_run/T9291.hs

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="774d88050336ef660c7a219fb06c480c2fc639bc">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f0d83bab1f471fb9f0b8ff8cd1aa75ec6c6a4a20...5397fe394009f07b0c42977af1bc1030c2592b8a#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.hs</strong></a>

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<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3523" 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="3523" 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">@@ -3523,7 +3523,6 @@ fFlagsDeps = [</td>

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<td class="diff-line-num old_line" data-linenumber="3523" 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">

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<td class="diff-line-num new_line" data-linenumber="3523" 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">

3523

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<pre style="margin: 0;"> <span id="LC3523" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"stg-cse"</span>                          <span class="kt" style="color: #458; font-weight: 600;">Opt_StgCSE</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3524" 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">

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<td class="diff-line-num new_line" data-linenumber="3524" 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">

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<pre style="margin: 0;"> <span id="LC3524" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"stg-lift-lams"</span>                    <span class="kt" style="color: #458; font-weight: 600;">Opt_StgLiftLams</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3525" 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">

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<td class="diff-line-num new_line" data-linenumber="3525" 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">

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<pre style="margin: 0;"> <span id="LC3525" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"cpr-anal"</span>                         <span class="kt" style="color: #458; font-weight: 600;">Opt_CprAnal</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="3526" 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">

3526

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<td class="diff-line-num new_line old" data-linenumber="3526" 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="LC3526" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"case-binder-cpr"</span>                  <span class="kt" style="color: #458; font-weight: 600;">Opt_CaseBinderCpr</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3527" 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">

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<td class="diff-line-num new_line" data-linenumber="3526" 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">

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<pre style="margin: 0;"> <span id="LC3526" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"defer-diagnostics"</span>                <span class="kt" style="color: #458; font-weight: 600;">Opt_DeferDiagnostics</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3528" 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">

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<td class="diff-line-num new_line" data-linenumber="3527" 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">

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<pre style="margin: 0;"> <span id="LC3527" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"defer-type-errors"</span>                <span class="kt" style="color: #458; font-weight: 600;">Opt_DeferTypeErrors</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3529" 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">

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<td class="diff-line-num new_line" data-linenumber="3528" 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">

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<pre style="margin: 0;"> <span id="LC3528" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"defer-typed-holes"</span>                <span class="kt" style="color: #458; font-weight: 600;">Opt_DeferTypedHoles</span><span class="p">,</span></span>

</pre>

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<br>

</li>

<li id="2e45f2cd303dd998950a7c8042e796a5b2abd64f">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f0d83bab1f471fb9f0b8ff8cd1aa75ec6c6a4a20...5397fe394009f07b0c42977af1bc1030c2592b8a#2e45f2cd303dd998950a7c8042e796a5b2abd64f"><strong>docs/users_guide/using-optimisation.rst</strong></a>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="293" 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">@@ -293,6 +293,41 @@ by saying ``-fno-wombat``.</td>

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<pre style="margin: 0;"> <span id="LC293" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC294" class="line" lang="plaintext">    Turn on CPR analysis in the demand analyser.</span>

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<pre style="margin: 0;"> <span id="LC295" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC296" class="line" lang="plaintext">.. ghc-flag:: -fcase-binder-cpr-depth</span>

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<pre style="margin: 0;">+<span id="LC297" class="line" lang="plaintext">    :shortdesc: Maximum depth at which case binders have the CPR property.</span>

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<pre style="margin: 0;">+<span id="LC298" class="line" lang="plaintext">    :type: dynamic</span>

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<pre style="margin: 0;">+<span id="LC299" class="line" lang="plaintext">    :category:</span>

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<pre style="margin: 0;">+<span id="LC300" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC301" class="line" lang="plaintext">    :default: 1</span>

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<pre style="margin: 0;">+<span id="LC302" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC303" class="line" lang="plaintext">    Normally, case binders get the CPR property if their scrutinee had it.</span>

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<pre style="margin: 0;">+<span id="LC304" class="line" lang="plaintext">    But depending on whether the case binder occurs on a cold path, it may make sense</span>

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<pre style="margin: 0;">+<span id="LC305" class="line" lang="plaintext">    to give it the CPR property unconditionally.</span>

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<pre style="margin: 0;">+<span id="LC306" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC307" class="line" lang="plaintext">    This flag controls how deep inside a constructor application we still</span>

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<pre style="margin: 0;">+<span id="LC308" class="line" lang="plaintext">    consider CPR binders to have th CPR property. The default is 1, so the</span>

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<pre style="margin: 0;">+<span id="LC309" class="line" lang="plaintext">    following function will have the CPR property: ::</span>

</pre>

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<pre style="margin: 0;">+<span id="LC310" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC311" class="line" lang="plaintext">      f :: Bool -> Int -> Int</span>

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<pre style="margin: 0;">+<span id="LC312" class="line" lang="plaintext">      f False _   = 1</span>

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<pre style="margin: 0;">+<span id="LC313" class="line" lang="plaintext">      f _     x@2 = x</span>

</pre>

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<pre style="margin: 0;">+<span id="LC314" class="line" lang="plaintext">      f _     _   = 3</span>

</pre>

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<pre style="margin: 0;">+<span id="LC315" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC316" class="line" lang="plaintext">    Note that ``x`` did not occur nested inside a constructor, so depth 1.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC317" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="318" 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">

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<pre style="margin: 0;">+<span id="LC318" class="line" lang="plaintext">    On the other hand, the following function will *not* have the Nested CPR</span>

</pre>

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<pre style="margin: 0;">+<span id="LC319" class="line" lang="plaintext">    property: ::</span>

</pre>

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<pre style="margin: 0;">+<span id="LC320" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC321" class="line" lang="plaintext">      g :: Bool -> Int -> (Int, Int)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC322" class="line" lang="plaintext">      g False _   = (1, 1)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC323" class="line" lang="plaintext">      g _     x@2 = (x, x)</span>

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<pre style="margin: 0;">+<span id="LC324" class="line" lang="plaintext">      g _     _   = (3, 3)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC325" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC326" class="line" lang="plaintext">    Because ``x`` occurs nested inside a pair, so at depth 2.</span>

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<pre style="margin: 0;">+<span id="LC327" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC328" class="line" lang="plaintext">    Depth 0 will never give any CPR binder the CPR property, unless the</span>

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<pre style="margin: 0;">+<span id="LC329" class="line" lang="plaintext">    scrutinee had it to begin with.</span>

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<pre style="margin: 0;">+<span id="LC330" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC331" class="line" lang="plaintext">.. ghc-flag:: -fcse</span>

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<pre style="margin: 0;"> <span id="LC332" class="line" lang="plaintext">    :shortdesc: Enable common sub-expression elimination. Implied by :ghc-flag:`-O`.</span>

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<pre style="margin: 0;"> <span id="LC333" class="line" lang="plaintext">    :type: dynamic</span>

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<br>

</li>

<li id="a486bf3cf5cbff9bebd842ee633d35800c09ce4f">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f0d83bab1f471fb9f0b8ff8cd1aa75ec6c6a4a20...5397fe394009f07b0c42977af1bc1030c2592b8a#a486bf3cf5cbff9bebd842ee633d35800c09ce4f"><strong>testsuite/tests/simplStg/should_run/T9291.hs</strong></a>

<hr>

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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">@@ -2,17 +2,19 @@</td>

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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>

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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Unsafe.Coerce</span></span>

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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></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;">-- The use of lazy in this module prevents Nested CPR from happening.</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;">-- Doing so would separate contructor application from their payloads,</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;">-- so that CSE can't kick in.</span></span>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is unfortunate, but this testcase is about demonstrating</span></span>

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- effectiveness of STG CSE.</span></span>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>

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5

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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Int</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;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">x</span></span>

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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE foo #-}</span></span>

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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">bar</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- lazy prevents Nested CPR from returning just (# x, x #) here.</span></span>

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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Doing so would lead to reboxing at the call site, where CSE</span></span>

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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- isn't able to see that both tuple components are equivalent.</span></span>

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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is unfortunate, but this testcase is about demonstrating</span></span>

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<td class="diff-line-num new_line old" data-linenumber="17" 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="LC15" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- effectiveness of STG CSE.</span></span>

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<td class="diff-line-num new old_line" data-linenumber="16" 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">

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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Why lazy? See comment above; the worker would return (# x, x #)</span></span>

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">bar</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">lazy</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">lazy</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE bar #-}</span></span>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="25" 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="27" 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">@@ -25,11 +27,12 @@ nested _ = Left True</td>

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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- CSE in a recursive group</span></span>

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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Tree</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tree</span> <span class="n" style="color: #333;">x</span><span class="p">))</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tree</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">rec1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Tree</span> <span class="n" style="color: #333;">x</span></span>

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Why lazy? See comment above; the worker would return (# x, t, t #)</span></span>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">rec1</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span></span>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">r1</span> <span class="n" style="color: #333;">r2</span></span>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell">        <span class="n" style="color: #333;">r1</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">t</span></span>

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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell">        <span class="n" style="color: #333;">r2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">t</span></span>

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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">t</span></span>

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;"><span class="idiff left">lazy</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">t</span></span>

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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE rec1 #-}</span></span>

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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Not yet supported! (and tricky)</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">@@ -42,17 +45,8 @@ rec2 x =</td>

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE rec2 #-}</span></span>

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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="n" style="color: #333;">test</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>

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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">r1</span><span class="p">,</span><span class="n" style="color: #333;">r2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bar</span> <span class="n" style="color: #333;">x</span></span>

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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">same</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">r1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">r2</span></span>

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<pre style="margin: 0;">-<span id="LC47" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">r3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foo</span> <span class="n" style="color: #333;">r1</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC48" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">same</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">r1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">r3</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="49" 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">

49

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<td class="diff-line-num new_line old" data-linenumber="48" 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="LC49" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">r4</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bar</span> <span class="n" style="color: #333;">r1</span></span>

</pre>

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50

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<td class="diff-line-num new_line old" data-linenumber="48" 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="LC50" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">r5</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nested</span> <span class="n" style="color: #333;">r4</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="51" 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">

51

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<td class="diff-line-num new_line old" data-linenumber="48" 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="LC51" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">same</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">r4</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">r5</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="52" 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">

52

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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">r6</span> <span class="n" style="color: #333;">r7</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rec1</span> <span class="n" style="color: #333;">x</span></span>

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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">same</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">r6</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">r7</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">s1</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">s2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rec2</span> <span class="n" style="color: #333;">x</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC55" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">same</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">s1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">s2</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="56" 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">

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE test #-}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="57" 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">

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<td class="diff-line-num new_line" data-linenumber="51" 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">

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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="58" 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">

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<td class="diff-line-num new_line" data-linenumber="52" 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">

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">test</span> <span class="s" style="color: #d14;">"foo"</span></span>

</pre>

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