5 ms·

Are you willing to contribute to the port? Don't rubbish other peoples' work unless you've got something better to replace it with.

moocowtruck 8y ago
good point, but i think we can admit the title is weird if the only support is x86-64
- lukego 8y ago
  RaptorJIT is good for writing applications like Snabb. Snabb is a networking framework that’s very low level: cycle-counting loops, device drivers, DMA, etc, in Lua. In this domain of high performance software networking the advantages of supporting other architectures don’t currently outweigh the costs. That’s why it’s a low-level system programming language that prioritizes working very well on x86-64 over supporting other platforms like 32-bit heap, MIPS, Xbox, no FPU, etc. Just got bigger fish to fry right now.
  - raytracer 8y ago
    > no FPU. How much of a hit does floating point math take? I have a desire to build some realtime audio tools.
    - justincormack 8y ago
      The wording is confusing it does support fpu it doesn’t support machines without fpu.
      - DarkWiiPlayer 8y ago
        It seems pretty clear to me. It doesn't support "no fpu". It's a lazy way of putting it though and "Architectures without FPU" would have been clearer.
    - pygy_ 8y ago
      AFAIK it is not about float perf. LuaJIT uses NaN-tagging to represent Lua values in memory to save space. Float64 numbers can be left alone, and other types are represented as NaN with the pointer bits stashed in the mantissa part of the float. Only one, canonical NaN value is recognized as such by the language, the others are disguised 32 bit pointers.
    - cordite 8y ago
      On microcontrollers, you might as well change to lookup tables if you are trying to do something real-time with more than 100 operations per millisecond. This varies by microcontroller obviously.. this comes from reimplementing GLSL shadertoy samples for a neopixel grid.
    - lukego 8y ago
      Realtime audio sounds like a good domain. You might also want to check out LuaRadio if you haven't already. http://luaradio.io/ http://luaradio.io/
  - floatboth 8y ago
    Yeah, 32-bit, Xbox and no-FPU platforms can be dropped, but dropping FreeBSD, aarch64 and powerpc64 is kinda sad.
  - imtringued 8y ago
    Does that mean ARM64 is still supported?

moocowtruck 8y ago

good point, but i think we can admit the title is weird if the only support is x86-64

lukego 8y ago
RaptorJIT is good for writing applications like Snabb. Snabb is a networking framework that’s very low level: cycle-counting loops, device drivers, DMA, etc, in Lua. In this domain of high performance software networking the advantages of supporting other architectures don’t currently outweigh the costs. That’s why it’s a low-level system programming language that prioritizes working very well on x86-64 over supporting other platforms like 32-bit heap, MIPS, Xbox, no FPU, etc. Just got bigger fish to fry right now.
- raytracer 8y ago
  > no FPU. How much of a hit does floating point math take? I have a desire to build some realtime audio tools.
  - justincormack 8y ago
    The wording is confusing it does support fpu it doesn’t support machines without fpu.
    - DarkWiiPlayer 8y ago
      It seems pretty clear to me. It doesn't support "no fpu". It's a lazy way of putting it though and "Architectures without FPU" would have been clearer.
  - pygy_ 8y ago
    AFAIK it is not about float perf. LuaJIT uses NaN-tagging to represent Lua values in memory to save space. Float64 numbers can be left alone, and other types are represented as NaN with the pointer bits stashed in the mantissa part of the float. Only one, canonical NaN value is recognized as such by the language, the others are disguised 32 bit pointers.
  - cordite 8y ago
    On microcontrollers, you might as well change to lookup tables if you are trying to do something real-time with more than 100 operations per millisecond. This varies by microcontroller obviously.. this comes from reimplementing GLSL shadertoy samples for a neopixel grid.
  - lukego 8y ago
    Realtime audio sounds like a good domain. You might also want to check out LuaRadio if you haven't already. http://luaradio.io/ http://luaradio.io/
- floatboth 8y ago
  Yeah, 32-bit, Xbox and no-FPU platforms can be dropped, but dropping FreeBSD, aarch64 and powerpc64 is kinda sad.
- imtringued 8y ago
  Does that mean ARM64 is still supported?