DOS ain't dead - PCI phased out?

PCI phased out? (Announce)

posted by Rugxulo , Usono, 21.02.2011, 07:43

> > Knowing the interface is (intentionally) not the same as knowing the
> > implementation. I assume you understand this. ;-) ;-)
>
> Then how did we get Wine or FreeDOS?

There are unofficial "undocumented" books out there, as well as documented, but it's incomplete. Bugs still remain. Clean room reverse engineering helps, I guess, but even that can't do everything. Sometimes it's really just easier to rewrite/reinvent from scratch.

> How many free registers is enough, 16? 256? 512? 1024?
>
> 16 is a nice number.

You well know that 16 would never be "enough"!

> Except double code/maintenance, disabling of inlining in many places etc.

You're already doing double/triple/quadruple maintenance by supporting various platforms. But no, I'm talking about a tiny tiny portion of the code, having been profiled, not big chunks that don't affect the speed. And that's assuming your app even needs speed. Whatever happened to "computers are fast enough"?? :-P

> paq is not a good example since the code is probably manually crafted for
> speed and has intense tight loops. I don't consider it general purpose app
> code.

It's not for daily use, no, and I don't think it was tuned for speed (very slow, comparatively), only for academic curiosity. That's why I was impressed, that it managed to do so much and yet with a tiny tiny bit of code, speedup by 2x. But it's a rare example, most apps don't have such things.

> Vectoring or simple FPU usage according to ABI is a different thing. I have
> to admit that I don't know all ins and outs of that either. I doubt SSE2 FP
> fully lives up to the IEEE standards

SSE2 doesn't support the 80-bit precision?? Dunno, it's quite boring.

> Probably win32s apps.

Dunno, would have to test. But I don't think Win32s ever really caught on. Then again, I'm far from experienced in Win16, so I could be wrong.

> > However, DJGPP (32-bit) stuff is native speed (e.g. Quake). I never
> tested
> > any 16-bit pmode stuff since that's relatively rare these days (oddly).
> I
> > should test again one day soon just for curiosity (HXDEV16 ftw!).
>
> Hmm. Some code through a JIT, some not? Or do you use some specific version
> of some extender? Since DOSEMU needs to process the 16-bit extender
> startupcode too, even if the bulk is 32-bit ?

AFAICT, there's no JIT. I doubt it has specific workarounds for DJGPP proper ("GO32"), but who knows. No, it just fakes the BIOS and DOS calls and leaves the rest alone.

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Complete thread:

PCI phased out? - marcov, 09.02.2011, 12:51 (Announce)
- PCI phased out? - RayeR, 09.02.2011, 16:24
  - PCI phased out? - marcov, 10.02.2011, 16:02
    - PCI phased out? - RayeR, 10.02.2011, 17:57
      - PCI phased out? - marcov, 10.02.2011, 21:10
        PCI phased out? - RayeR, 11.02.2011, 00:25
        PCI phased out? - marcov, 11.02.2011, 10:56
        PCI phased out? - RayeR, 12.02.2011, 02:34
        PCI phased out? - marcov, 12.02.2011, 12:45
        PCI phased out? - Rugxulo, 12.02.2011, 21:28
        PCI phased out? - DOS386, 13.02.2011, 06:02
        PCI phased out? - RayeR, 13.02.2011, 16:11
        PCI phased out? - DOS386, 14.02.2011, 09:27
        PCI phased out? - marcov, 14.02.2011, 10:29
        NTVDM speed (or lack thereof) - Ninho, 15.02.2011, 12:26
        NTVDM speed (or lack thereof) - Rugxulo, 15.02.2011, 14:26
        NTVDM speed (or lack thereof) - marcov, 15.02.2011, 14:33
        NTVDM speed (or lack thereof) - Ninho, 15.02.2011, 20:27
        NTVDM speed (or lack thereof) - Rugxulo, 15.02.2011, 23:21
        NTVDM speed (or lack thereof) - marcov, 16.02.2011, 09:24
        NTVDM speed (or lack thereof) - Ninho, 16.02.2011, 20:04
        NTVDM speed (or lack thereof) - RayeR, 16.02.2011, 01:50
        NTVDM speed (or lack thereof) - Rugxulo, 16.02.2011, 02:24
        NTVDM speed (or lack thereof) - RayeR, 16.02.2011, 10:41
        NTVDM speed (or lack thereof) - rr, 17.02.2011, 20:33
        PCI phased out? - RayeR, 14.02.2011, 15:45
        PCI phased out? - marcov, 15.02.2011, 13:40
        PCI phased out? - RayeR, 15.02.2011, 15:15
        PCI phased out? - marcov, 15.02.2011, 18:43
        PCI phased out? - RayeR, 15.02.2011, 19:46
        PCI phased out? - marcov, 16.02.2011, 10:36
        PCI phased out? - RayeR, 16.02.2011, 12:22
        PCI phased out? - marcov, 16.02.2011, 15:38
        PCI phased out? - Rugxulo, 16.02.2011, 19:18
        PCI phased out? - marcov, 16.02.2011, 21:22
        PCI phased out? - Rugxulo, 17.02.2011, 02:28
        EOD (was "PCI phased out?") - DOS386, 17.02.2011, 06:44
        PCI phased out? - marcov, 17.02.2011, 19:44
        PCI phased out? - Rugxulo, 18.02.2011, 08:39
        PCI phased out? - marcov, 18.02.2011, 09:30
        PCI phased out? - Rugxulo, 21.02.2011, 07:43
        PCI phased out? - Rugxulo, 08.03.2011, 23:47
        PCI phased out? - Rugxulo, 11.03.2011, 00:06
        PCI phased out? - roytam, 11.03.2011, 07:52
        PCI phased out? - Rugxulo, 17.03.2011, 04:16
        PCI phased out? - Ninho, 19.02.2011, 10:56
        PCI phased out? - Rugxulo, 21.02.2011, 07:15
        PCI phased out? - marcov, 21.02.2011, 14:09
        PCI phased out? - Laaca, 21.02.2011, 14:22
        PCI phased out? - marcov, 21.02.2011, 14:47
        PCI phased out? - roytam, 22.02.2011, 04:26
        PCI phased out? - RayeR, 22.02.2011, 13:29
        PCI phased out? - RayeR, 22.02.2011, 23:44
        PCI phased out? - Ninho, 23.02.2011, 17:39
        PCI phased out? - RayeR, 23.02.2011, 19:47
        PCI phased out? - Ninho, 23.02.2011, 19:56
        PCI phased out? - RayeR, 23.02.2011, 23:27
        PCI phased out? - RayeR, 24.02.2011, 14:37
        PCI phased out? - Rugxulo, 16.03.2011, 04:58
        PCI phased out? - RayeR, 18.02.2011, 14:28
        PCI phased out? - marcov, 18.02.2011, 14:56
        PCI phased out? - roytam, 29.01.2015, 03:45