First They Laugh Then You Win

First they laugh at you... Upgrade your browsing The world's first HTML5 accelerator card is here. Your custom chips work with Chrome and with Electron apps to give you a web experience like never before. • One PCI Express x16 card, endless power • Supports viewports up to 7680x4320 and refresh rates up to 240Hz • Parallel renderer with on-Firefox and CSS3 colors • Shielded event buffer for smooth, noise-free mouse movements • 8 programmable Virtual DOM chips for super-Fast React apps • Seguri-Dad TPM cryptography signs your web requests so you never have to complete a CAPTCHA again • Low-voltage SVG rasteriser Check out the benchmarks... MAX DISCORD SCROLLBACK [TEXT AND ITS UNREAD BEFORE CLIENT DROPS TO UNDER 5 FPS] FACEBOOK NEWS FEED FPS [SCROLLING THROUGH THE NEWS FEED TO AVOID MISSING THE MOMENT] PREDICTIVE JSON DESERIALISER 1024-BIT RENDERER 16 GB DDR4 8-CORE 2.5 GHz CPU VIRTUAL DOM+ 8-STAFF PIPELINE DUAL GARBAGE COLLECTOR [HIGH-FREQ SCROLLING] @_Ninji spent far too much time on this ...then you win Why do ARM chips have an instruction with Javascript in the name (FJCVTZS)? Asked 2 years, 4 months ago Active yesterday Viewed 57k times FJCVTZS is “Floating-point Javascript Convert to Signed fixed-point, rounding toward Zero”. It is supported in Arm v8.3-A chips and later. Which is odd, because you don't expect to see JavaScript so close to the bare metal. I can find explanations of what the instruction does, but not why it exists. This thread says “it exists as a single instruction because JS's lack of an integer type means certain use cases need this operation obscenely often for no good algorithmic reason.” That's plausible but I would like a more detailed understanding. javascript assembly arm 1 Answer It is because JS uses double precision for the numbers, but if you want to perform operations with bits, the task is nontrivial, so a specific instruction to convert JS double into integer makes the thing easier. This ARM link explains it very well: https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/armv8-3-a-architecture-2016-additions

Вверху показана шуточная реклама огромной видеокарты для ускорения браузера, а внизу — настоящий вопрос о специальной ARM-инструкции FJCVTZS, связанной с JavaScript. Шутка в том, что над JavaScript обычно смеются как над нелепым языком, но он настолько распространён, что для него даже добавили отдельную аппаратную инструкцию. Мем используют как реакцию на неожиданное доказательство того, что JavaScript «победил» и проник на самый низкий уровень железа.

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