{"id":259152,"date":"2007-01-01T06:00:59","date_gmt":"2007-01-01T14:00:59","guid":{"rendered":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/?post_type=msr-research-item&#038;p=259152"},"modified":"2018-10-16T20:08:59","modified_gmt":"2018-10-17T03:08:59","slug":"system-f-with-type-equality-coercions-2","status":"publish","type":"msr-research-item","link":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/publication\/system-f-with-type-equality-coercions-2\/","title":{"rendered":"Call-pattern specialisation for Haskell programs"},"content":{"rendered":"\n\n\n<p class=\"wp-block-paragraph\">User-defined data types, pattern-matching, and recursion are ubiquitous features of Haskell programs. Sometimes a function is called with arguments that are statically known to already be in constructor form, so that the work of pattern-matching is wasted. Even worse, the argument is sometimes freshly-allocated, only to be immediately decomposed by the function.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this paper we describe a simple, modular transformation that specialises recursive functions according to their argument &#8220;shapes&#8221;. We show that such a transformation has a simple, modular implementation, and that it can be extremely effective in practice, eliminating both pattern-matching and heap allocation. We describe our implementation of this constructor specialisation transformation in the Glasgow Haskell Compiler, and give measurements of its effectiveness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">See also &#8220;<a class=\"msr-external-link glyph-append glyph-append-open-in-new-tab glyph-append-xsmall\" rel=\"noopener noreferrer\" target=\"_blank\" href=\"http:\/\/www.cse.unsw.edu.au\/~dons\/papers\/CLS07.html\">Stream Fusion From Lists to Streams to Nothing at All<span class=\"sr-only\"> (opens in new tab)<\/span><\/a>&#8221; by Coutts, Leshchinskiy, and Stewart.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a class=\"msr-external-link glyph-append glyph-append-open-in-new-tab glyph-append-xsmall\" rel=\"noopener noreferrer\" target=\"_blank\" href=\"http:\/\/haskell.org\/haskellwiki\/Simonpj\/Talk:Papers\">Wiki talk page for discussion<span class=\"sr-only\"> (opens in new tab)<\/span><\/a><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>User-defined data types, pattern-matching, and recursion are ubiquitous features of Haskell programs. Sometimes a function is called with arguments that are statically known to already be in constructor form, so that the work of pattern-matching is wasted. Even worse, the argument is sometimes freshly-allocated, only to be immediately decomposed by the function. In this paper [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":[{"type":"user_nicename","value":"simonpj"}],"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"Submitted to ICFP 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