Conversation
Jarkko Sakkinen
jarkko
I learned over the weekend (I was at a local #rustlang meetup) that interrupt controller caps #riscv for competing with #ARM on real-time tasks. I also learned about #CLIC. Just wondering are there any other extensions making waves or is CLIC where the world is converging.
More information:
https://ieeexplore.ieee.org/document/9660345
More information:
https://ieeexplore.ieee.org/document/9660345
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I was actually surprised how crappy the thing is in the standard ATM but obviously it will get fixed at some point.
Another thing I learned is that ARMv8 has special opcodes for JavaScript :D Fixing a horrible programming language with hardware features is pretty interesting.
Another thing I learned is that ARMv8 has special opcodes for JavaScript :D Fixing a horrible programming language with hardware features is pretty interesting.
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Markus Wamser
wamserma@hachyderm.io
@jarkko I still remember ARMv5TEJ (Jazelle) being introduced...
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Jarkko Sakkinen
jarkko
@wamserma JavaScript has this crippled number presentation where number is either 32-bit signed int or a double depending on operation applied.
So they added https://developer.arm.com/documentation/dui0801/h/A64-Floating-point-Instructions/FJCVTZS
:-)
So they added https://developer.arm.com/documentation/dui0801/h/A64-Floating-point-Instructions/FJCVTZS
:-)
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@jarkko Yes, via the "Fast Interrupts Task Group" https://wiki.riscv.org/display/HOME/Fast+Interrupts+TG. Though I don't track pure embedded stuff as closely. For higher end systems, it's https://github.com/riscv/riscv-aia
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@jarkko @wamserma RISC-V now has this, too. Zfa extension: https://github.com/riscv/riscv-isa-manual/blob/main/src/zfa.adoc#modular-convert-to-integer-instruction
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