Editing SpiderMonkey (section)

===IonMonkey===
IonMonkey was a JavaScript JIT compiler of Mozilla, which was aimed to enable many new optimizations that were impossible with the prior JägerMonkey architecture.<ref name="mozilla1">{{cite web |url=https://wiki.mozilla.org/Platform/Features/IonMonkey |title=Platform/Features/IonMonkey - MozillaWiki |publisher=Wiki.mozilla.org |date=11 February 2013 |access-date=21 March 2013 |archive-url=https://web.archive.org/web/20130308142525/https://wiki.mozilla.org/Platform/Features/IonMonkey |archive-date=8 March 2013 |url-status=live |df=dmy-all }}</ref>

IonMonkey was a more traditional compiler: it translated SpiderMonkey [[bytecode]] into a [[control-flow graph]], using [[static single assignment form]] (SSA) for the [[intermediate representation]]. This architecture enabled well-known optimizations from other programming languages to be used for JavaScript, including type specialization, [[function inlining]], linear-scan [[register allocation]], [[dead code elimination]], and [[loop-invariant code motion]].<ref>{{cite web |url=http://www.infoq.com/news/2011/05/ionmonkey |title=IonMonkey: Mozilla's new JavaScript JIT compiler |publisher=Infoq.com |access-date=21 March 2013 |archive-url=https://web.archive.org/web/20121208010755/http://www.infoq.com/news/2011/05/ionmonkey |archive-date=8 December 2012 |url-status=live |df=dmy-all }}</ref>

The compiler can emit fast [[native code]] translations of JavaScript functions on the [[ARM architecture|ARM]], [[x86]], and [[x86-64]] platforms. It has been the default engine since Firefox 18.<ref>{{cite web |url=https://website-archive.mozilla.org/www.mozilla.org/firefox_releasenotes/en-US/firefox/18.0/releasenotes/ |title=Firefox Notes - Desktop |publisher=Mozilla.org |date=8 January 2013 |access-date=21 March 2013 |archive-url=https://web.archive.org/web/20140902235153/http://website-archive.mozilla.org/www.mozilla.org/firefox_releasenotes/en-US/firefox/18.0/releasenotes/ |archive-date=2 September 2014 |url-status=live |df=dmy-all }}</ref>