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 <link rel="alternate" type="application/json" href="/feed.json" title="IOG Engineering JSON Feed"><title data-react-helmet="true">GHC January 2022 update | IOG Engineering</title><meta data-react-helmet="true" name="twitter:card" content="summary_large_image"><meta data-react-helmet="true" property="og:url" content="https://engineering.iog.io/2022-02-01-ghc-january-2022-update"><meta data-react-helmet="true" name="docusaurus_locale" content="en"><meta data-react-helmet="true" name="docusaurus_tag" content="default"><meta data-react-helmet="true" property="og:title" content="GHC January 2022 update | IOG Engineering"><meta data-react-helmet="true" name="description" content="Hopefully 2022 should be the year GHC will get a JavaScript backend without relying on GHCJS. This month the team has been busy planning the work that needs to be done to get there!"><meta data-react-helmet="true" property="og:description" content="Hopefully 2022 should be the year GHC will get a JavaScript backend without relying on GHCJS. This month the team has been busy planning the work that needs to be done to get there!"><meta data-react-helmet="true" property="og:type" content="article"><meta data-react-helmet="true" property="article:published_time" content="2022-02-01T00:00:00.000Z"><meta data-react-helmet="true" property="article:tag" content="ghc,ghc-update"><link data-react-helmet="true" rel="icon" href="/img/favicon.ico"><link data-react-helmet="true" rel="canonical" href="https://engineering.iog.io/2022-02-01-ghc-january-2022-update"><link data-react-helmet="true" rel="alternate" href="https://engineering.iog.io/2022-02-01-ghc-january-2022-update" hreflang="en"><link data-react-helmet="true" rel="alternate" href="https://engineering.iog.io/2022-02-01-ghc-january-2022-update" hreflang="x-default"><link rel="stylesheet" href="/assets/css/styles.10ad4647.css">
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This month the team has been busy planning the work that needs to be done to get there!</p><h2 class="anchor anchorWithStickyNavbar_mojV" id="cross-compilation">Cross-compilation<a class="hash-link" href="#cross-compilation" title="Direct link to heading"></a></h2><ul><li>GHCJS has been <a href="https://github.com/ghcjs/ghc/tree/ghc-8.10-ghcjs" target="_blank" rel="noopener noreferrer">updated</a> to reduce the gap with GHC 8.10.7 codebase to the point that GHC’s build system is used to build GHCJS</li><li>Internal work planning for the integration of GHCJS into GHC</li><li>A different approach to load plugins into cross-compilers has been implemented <!-- -->[<a href="https://gitlab.haskell.org/ghc/ghc/-/issues/20964" target="_blank" rel="noopener noreferrer">#20964</a>, <a href="https://gitlab.haskell.org/ghc/ghc/-/merge_requests/7377" target="_blank" rel="noopener noreferrer">!7377</a>]</li><li>GHCJS has been exercised to showcase compilation of some Plutus applications</li></ul><h2 class="anchor anchorWithStickyNavbar_mojV" id="modularity">Modularity<a class="hash-link" href="#modularity" title="Direct link to heading"></a></h2><ul><li>A few “subsystems” of GHC have been made more modular and reusable by making them independent of the command-line flags (<code>DynFlags</code>) <!-- -->[<a href="https://gitlab.haskell.org/ghc/ghc/-/issues/17957" target="_blank" rel="noopener noreferrer">#17957</a>, <a href="https://gitlab.haskell.org/ghc/ghc/-/merge_requests/7158" target="_blank" rel="noopener noreferrer">!7158</a>, <a href="https://gitlab.haskell.org/ghc/ghc/-/merge_requests/7199" target="_blank" rel="noopener noreferrer">!7199</a>, <a href="https://gitlab.haskell.org/ghc/ghc/-/merge_requests/7325" target="_blank" rel="noopener noreferrer">!7325</a>]<!-- -->. This work resulted in a 10% reduction in call sites to <code>DynFlags</code> and has now removed all references to <code>DynFlags</code> up to the <code>CoreToStg</code> pass, which is almost the entire backend of GHC.</li></ul><h2 class="anchor anchorWithStickyNavbar_mojV" id="performance">Performance<a class="hash-link" href="#performance" title="Direct link to heading"></a></h2><ul><li>Jeffrey wrote a new HF <a href="https://github.com/haskellfoundation/tech-proposals/pull/26" target="_blank" rel="noopener noreferrer">proposal</a> about writing a Haskell Optimization handbook and has started working on it</li></ul></div><footer class="row docusaurus-mt-lg blogPostDetailsFull_h6_j"><div class="col"><b>Tags:</b><ul class="tags_XVD_ padding--none margin-left--sm"><li class="tag_JSN8"><a class="tag_hD8n tagRegular_D6E_" href="/tags/ghc">ghc</a></li><li class="tag_JSN8"><a class="tag_hD8n tagRegular_D6E_" href="/tags/ghc-update">ghc-update</a></li></ul></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Blog post page navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/2022-03-01-haskell-nix-february-update"><div class="pagination-nav__sublabel">Newer Post</div><div class="pagination-nav__label">haskell.nix February Update</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/2022-02-01-haskell-nix-january-update"><div class="pagination-nav__sublabel">Older Post</div><div class="pagination-nav__label">haskell.nix January Update</div></a></div></nav></main><div class="col col--2"><div class="tableOfContents_cNA8 thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#cross-compilation" class="table-of-contents__link toc-highlight">Cross-compilation</a></li><li><a href="#modularity" class="table-of-contents__link toc-highlight">Modularity</a></li><li><a href="#performance" class="table-of-contents__link toc-highlight">Performance</a></li></ul></div></div></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items"><li class="footer__item"><a href="https://twitter.com/iog_eng" target="_blank" rel="noopener noreferrer" class="footer__link-item"><span>Twitter<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_I5OW"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></span></a></li></ul></div><div class="col footer__col"><div class="footer__title">More</div><ul class="footer__items"><li class="footer__item"><a href="https://iohk.io/en/blog" target="_blank" rel="noopener noreferrer" class="footer__link-item">IOG Blog</a></li><li class="footer__item"><a href="https://github.com/input-output-hk/" target="_blank" rel="noopener noreferrer" class="footer__link-item"><span>GitHub<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_I5OW"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></span></a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2023 IOG Engineering, Inc. 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