Maybe you don't need Rust and WASM to speed up your JS
Few weeks ago I noticed a blog post “Oxidizing Source Maps with Rust and WebAssembly” making rounds on Twitter - talking about performance benefits of replacing plain JavaScript in the core of source-map library with a Rust version compiled to WebAssembly. This post piqued my interest, not because I am a huge on either Rust or WASM, but rather because I am always curious about language features an
Crankshaft vs arguments object
This is a note in reply to Victor Felder’s question who asked me what “Unsupported phi use of arguments” Crankshaft bailout means. What Crankshaft is trying to do is to completely avoid allocating arguments object when you write the code like this: function foo() { var sum = 0; for (var i = 0; i < arguments.length /* (1) */; i++) { sum += arguments[i]; /* (2) */ } } If one compiles this code naive
Do not Measure the Weather
Java VM V8 Dart VM complexity ChaCha20 function getBlock(buffer) { var x = new Uint32Array(16); for (var i = 16; i--;) x[i] = input[i]; for (var i = 20; i > 0; i -= 2) { quarterRound(x, 0, 4, 8,12); quarterRound(x, 1, 5, 9,13); quarterRound(x, 2, 6,10,14); quarterRound(x, 3, 7,11,15); quarterRound(x, 0, 5,10,15); quarterRound(x, 1, 6,11,12); quarterRound(x, 2, 7, 8,13); quarterRound(x, 3, 4, 9,14)
What's up with monomorphism?
Talks and blog posts about JavaScript performance often emphasize importance of monomorphic code. However they usually don’t provide any digestible explanation of what monomorphism/polymorhism is and why it matters. Even my own talks often boil down to Hulk-style «ONE TYPE GOOD. TWO TYPE BAD!!!» dichotomy. Unsurprisingly one of the most common requests I get when people reach out to me for a perfo
AngularDart & Polymer.dart
AngularDart & Polymer.dart by a compiler engineer __ cmpl(FieldAddress(field_reg, Field::guarded_cid_offset()), Immediate(kDynamicCid)); __ j(EQUAL, &ok); <cmpl> <FieldAddress>…</FieldAddress>, <Immediate>kDynamicCid</Immediate></cmpl> <j cond="EQUAL" href="#ok"></j> when we were kids DHTML XSLT $HTML var $ul = $("<ul/>", {class: "nav nav-tabs"}); for (var i = 0; i < tabs.length; i++) { $("<li/>")
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LXJS 2013 - Doubt Everything
WebRebels 2014 - Crooked Mirrors of Performance