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First they laugh at you...
Upgrade your browsing
HTMLS accelerator card is here. Our custom chips
END
and with Electron apps to give you a web
SPAN
like never before
ОпеРС! Express card. endless power
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@_Ninji spent far too much time on this
you win
Why ARM chips have an instruction with Javascript in the name
Asked 2 years, 4 months ago
yesterday
times
EJCVTZS is "Floating-point Javascript Convert to Signed fixed-point, rounding toward Zero”. It is
ILD
The С
supported in Arm chips and later. Which is odd, because you don't expect to see JavaScript
126
so close to the bare metal
can find explanations of what the instruction does, but not why it exists. This thread says "it exists
а
as a Single instruction is because JS's lack of an integer type means certain use cases need this
operation obscenely often for no good algorithmic геазоп.". plausible but would like a more
Featu
detailed understanding
OR
javascript
assembly
с
3
11
edited
1,132
1 Answer
Votes
It is because 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 double into integer makes the thing
114
easier.
This ARM link explains it very well: https://community.arm.com/processors/b/blog/posts/army8-a-
architecture-2016-additions