1. 2
    rmmh avatar rmmh 4 years ago | link | on: New Compiler OpenBSD Capabilities: -fstack-shuffle and Return Value Guards

    Does OpenBSD have any plans to move from GCC to Clang, like FreeBSD did?

    1. 4
      ssl avatar ssl 4 years ago | link

      http://marc.info/?l=openbsd-misc&m=137530560232232&w=2

    1. 3
      tel avatar tel 4 years ago | link | on: Computing 10,000x more efficiently

      This is really interesting. It’s always been clear to me in scientific computing that, except for repeatability and stability concerns, most of the math done is really fuzzy and could easily be replaced by less precise operations. Generally applying that would be a little tricky since stability concerns are very real in many standard algorithms, but there are a lot of tricks which allow you to “avoid division” in specialized algorithms.

      1. 1
        rmmh avatar rmmh 4 years ago | link

        1% error is especially irrelevant for algorithms that inherently include noise, like neural networks and computer vision. The quarter billion neurons in a human visual cortex don’t compute arithmetic with 32 bits of precision either.

      1. 1
        rmmh avatar rmmh 4 years ago | link | on: Seq: Generic immutable and lazy data structures for Go

        Could you document the time/space complexity of the different structures and operations?

        1. 2
          mediocregopher avatar mediocregopher 4 years ago | link

          I did time-complexity on most (I think) of them, although the ones based on Set are tentative. I’ll try to flesh it out a bit more though in the next day or so hopefully.

        1. 2
          zhemao avatar zhemao 4 years ago | link | on: LuaJIT 2.0.3 released

          Holy crap, you can run it on XBox and PS4? How did he even test that? Did Microsoft and Sony send him a devkit?

          1. 2
            tedu avatar tedu 4 years ago | link

            I imagine the people who paid for the port provided access. I think he has a decent thing going with game companies paying to port here or port there, etc.

            1. 2
              rmmh avatar rmmh 4 years ago | link

              PS4 support is relatively trivial – tweaking a few #ifdefs to know about the platform and porting a Makefile. LuaJIT already has well-tuned x86-64 support.

              The PS3/Xbox360 porting work is described here (search for “PS3”). Platform restrictions don’t permit the JIT, but the LuaJIT interpreter is hand-coded assembly that runs about 2x faster than the standard Lua interpreter.

              1. 1
                zhemao avatar zhemao 4 years ago | link

                The sheer number of platforms that LuaJIT supports astounds me.