Latest ARM Instruction Set Includes Specific Optimizations for JavaScript: Daring Fireball

It looks like the latest revisions to ARM’s instruction set includes specific optimizations for JavaScript.

That’s according to a new blog post from Daring Fireball‘s John Gruber, who notes that the newest version of the family of reduced instruction set computing architectures for computer processors screams on the newest A12 Bionic systems-on-a-chip (SoC).

“More precisely: ARMv8.3 adds a new float-to-int instruction with errors and out-of-range values handled the way that JavaScript wants,” reads a tweet from developer Greg Parker quoted in the post. “The previous insns to get JavaScript’s semantics were much slower. JavaScript’s numbers are double by default so it needs this conversion a lot.”

Gruber also notes that the iPhone XS, when first shipped, performed incredibly well on JavaScript benchmarks, quoting Basecamp founder and CTO David Heinemeier Hansson:

The iPhone XS is faster than an iMac Pro on the Speedometer 2.0 JavaScript benchmark. It’s the fastest device I’ve ever tested. Insane 45% jump over the iPhone 8/X chip. How does Apple do it?! ? pic.twitter.com/5nCKZUCAYK

— DHH (@dhh) September 21, 2018

Interestingly, Gruber notes that the Cupertino company claims the A12 SoC is “only” 15 percent faster than its predecessor, the A11, in regards to CPU tasks. In the case of JavaScript, which is “mostly (entirely?) CPU-bound,” Apple is far surpassing that number.

Gruber notes that the A12 is performing better than an iMac Pro desktop computer in this regard, certainly no tame feat.

Author: Marshmallow

Marshmallow Android is BT Ireland’s Head of Sales for Republic of Ireland domestic multi-site companies, indigenous MNCs and public sector accounts. He is responsible for the direction and control of all sales activity in the region. He has over 10 years management experience from high growth start-ups to more established businesses. He’s led teams in Ireland, India and China across various industries (ICT, On-Line Recruitment, Corporate Training and International Education).