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Re: C Compilers QoI

From BGB <cr88192@hotmail.com>
Newsgroups comp.lang.c
Subject Re: C Compilers QoI
Date 2017-03-29 23:51 -0500
Organization albasani.net
Message-ID <obi2rr$rcd$1@news.albasani.net> (permalink)
References <oa8pdp$nok$1@dont-email.me> <oa8st4$4a6$1@dont-email.me> <358a90c9-a40a-403f-a059-1ea90b3a5798@googlegroups.com> <oa9115$it9$1@dont-email.me>

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On 3/14/2017 10:11 AM, Andrey Tarasevich wrote:
> On 3/14/2017 7:36 AM, already5chosen@yahoo.com wrote:
>> On Tuesday, March 14, 2017 at 4:00:58 PM UTC+2, David Brown wrote:
>>>
>>> You are running /Windows/.  Windows is bad at 64-bit,
>>
>> Totally off topic, but which criterion of goodness/badness Windows is
>> bad at 64-bit?
>
> Don't feed the trolls. The previous comment is nonsensical. There's
> nothing wrong with Windows at 64 bit. In fact, in absence of credible
> competition to Windows the entire matter of "bad/good" is rather moot.
>

yeah, Win64 works pretty ok for the most part.

I have noted that comparing GCC on x86-64 to MSVC, with full 
optimizations, there often seems to be typically around a 5-15% or so 
speed advantage for GCC; but I suspect this is mostly because MSVC is at 
times prone to generating some rather brain-damaged code (vs being due 
to ABI, 1).

though, in this testing, ABI issues can't be fully eliminated, but best 
I can tell it doesn't seem to be a huge factor.

1: fairly often when something is eating a lot of time in the profiler, 
it is because MSVC has gone and compiled code in a rather braindamaged 
way, like turning a simple int->float cast into some huge mass of SSE 
vector operations; or moving items around via large numbers of "REP 
MOVSB" sequences or similar.



AFAICT:
the SysV/AMD64 ABI seems to hold up a little better with lots of small 
leaf-functions, but fares worse in many other cases.

tests with lots of by-value struct passing seem to favor Win64, as do 
cases involving winding through deep call stacks (and calling lots of 
non-leaf functions).

larger (and longer lived) functions don't really seem to care which ABI 
is used.


in both cases, 64-bit code seems to often be IME around 30-40% faster 
than 32-bit code; though 32-bit still holds a dominance for EXE files 
(it is nearly break-even WRT OS DLL's).


there is also a sizable number of OS DLLs with embedded .NET/CLR images 
(with hybrid DLLs being a majority vs pure CLR DLLs), however only a 
small number of .NET EXEs exist.

for EXE's, some past stats were ~ 70% 32-bit, 25% 64-bit, 5% CLR.

the existence of CLR EXEs/DLLs largely fell off the table if one 
excludes directories directly related to MS products and Windows itself.


or such...

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Thread

C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 13:01 +0000
  Re: C Compilers QoI mark.bluemel@gmail.com - 2017-03-14 06:16 -0700
  Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-14 06:42 -0700
  Re: C Compilers QoI "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-03-14 06:56 -0700
    Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 15:58 +0000
      Re: C Compilers QoI "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-03-14 09:22 -0700
      Re: C Compilers QoI scott@slp53.sl.home (Scott Lurndal) - 2017-03-14 16:54 +0000
        Re: C Compilers QoI supercat@casperkitty.com - 2017-03-14 10:24 -0700
          Re: C Compilers QoI scott@slp53.sl.home (Scott Lurndal) - 2017-03-14 17:58 +0000
            Re: C Compilers QoI supercat@casperkitty.com - 2017-03-14 14:12 -0700
              Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-14 16:34 -0500
              Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-14 17:36 -0500
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 23:06 +0000
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-14 16:20 -0700
              Re: C Compilers QoI antispam@math.uni.wroc.pl - 2017-03-15 02:32 +0000
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-15 12:49 +0000
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-15 11:56 -0700
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-15 23:09 +0000
                Re: C Compilers QoI scott@slp53.sl.home (Scott Lurndal) - 2017-03-16 18:17 +0000
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-16 11:47 -0700
                Re: C Compilers QoI Ian Collins <ian-news@hotmail.com> - 2017-03-17 07:50 +1300
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-16 12:59 -0700
                Re: C Compilers QoI David Brown <david.brown@hesbynett.no> - 2017-03-16 21:24 +0100
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-16 14:23 -0700
                Re: C Compilers QoI Ian Collins <ian-news@hotmail.com> - 2017-03-17 11:30 +1300
                Re: C Compilers QoI Ian Collins <ian-news@hotmail.com> - 2017-03-17 11:38 +1300
                Re: C Compilers QoI Gareth Owen <gwowen@gmail.com> - 2017-03-17 05:07 +0000
                Re: C Compilers QoI Ian Collins <ian-news@hotmail.com> - 2017-03-17 20:26 +1300
                Re: C Compilers QoI Gareth Owen <gwowen@gmail.com> - 2017-03-17 07:59 +0000
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-16 16:14 -0700
                Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-16 22:54 -0500
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-17 09:01 -0700
                Re: C Compilers QoI Ian Collins <ian-news@hotmail.com> - 2017-03-26 14:16 +1300
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-26 14:19 -0700
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-26 22:43 +0100
                Re: C Compilers QoI GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-27 01:28 +0200
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-26 22:07 -0700
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-27 11:28 +0100
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-27 07:38 -0700
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-27 16:23 +0100
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-27 08:55 -0700
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-27 17:01 +0100
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-27 10:03 -0700
                Re: C Compilers QoI GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-27 17:58 +0200
                Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-27 03:54 -0700
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-27 08:46 -0700
                Re: C Compilers QoI scott@slp53.sl.home (Scott Lurndal) - 2017-03-27 17:47 +0000
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-27 11:48 -0700
                Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-27 15:37 -0500
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-27 14:46 -0700
                Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-27 20:28 -0500
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-28 01:18 -0700
                Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-28 18:24 -0500
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-29 07:40 -0700
                Re: C Compilers QoI David Brown <david.brown@hesbynett.no> - 2017-03-29 17:05 +0200
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-29 11:07 -0700
                Re: C Compilers QoI antispam@math.uni.wroc.pl - 2017-03-31 04:04 +0000
                Re: C Compilers QoI bartc <bc@freeuk.com> - 2017-03-31 10:53 +0100
                Re: C Compilers QoI Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-31 07:35 -0700
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-31 08:07 -0700
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-31 07:54 -0700
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-31 07:43 -0700
                Re: C Compilers QoI Ian Collins <ian-news@hotmail.com> - 2017-03-17 11:21 +1300
                Re: C Compilers QoI Ian Collins <ian-news@hotmail.com> - 2017-03-17 11:24 +1300
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-16 22:15 +0000
                Re: C Compilers QoI scott@slp53.sl.home (Scott Lurndal) - 2017-03-17 12:31 +0000
                Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-16 15:24 -0700
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-16 16:03 -0700
                Re: C Compilers QoI scott@slp53.sl.home (Scott Lurndal) - 2017-03-17 12:39 +0000
                Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-17 08:27 -0700
                Re: C Compilers QoI antispam@math.uni.wroc.pl - 2017-03-16 01:35 +0000
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-16 02:18 +0000
                Re: C Compilers QoI antispam@math.uni.wroc.pl - 2017-03-18 00:45 +0000
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-18 13:12 +0000
                Re: C Compilers QoI antispam@math.uni.wroc.pl - 2017-03-18 20:31 +0000
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-18 17:31 -0700
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-16 09:22 -0700
          Re: C Compilers QoI Nick Bowler <nbowler@draconx.ca> - 2017-03-24 16:13 +0000
            Re: C Compilers QoI supercat@casperkitty.com - 2017-03-24 12:32 -0700
              Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-24 22:13 -0500
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-25 13:05 -0700
                Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-27 15:44 -0500
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-27 14:51 -0700
                Re: C Compilers QoI Robert Wessel <robertwessel2@yahoo.com> - 2017-03-27 20:31 -0500
        Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 17:26 +0000
          Re: C Compilers QoI Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-03-15 12:02 -0500
  Re: C Compilers QoI David Brown <david.brown@hesbynett.no> - 2017-03-14 15:00 +0100
    Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-14 07:36 -0700
      Re: C Compilers QoI David Brown <david.brown@hesbynett.no> - 2017-03-14 15:57 +0100
      Re: C Compilers QoI Andrey Tarasevich <andreytarasevich@hotmail.com> - 2017-03-14 08:11 -0700
        Re: C Compilers QoI BGB <cr88192@hotmail.com> - 2017-03-29 23:51 -0500
    Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 15:28 +0000
      Re: C Compilers QoI David Brown <david.brown@hesbynett.no> - 2017-03-14 21:41 +0100
  Re: C Compilers QoI Keith Thompson <kst-u@mib.org> - 2017-03-14 09:26 -0700
    Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 18:23 +0000
      Re: C Compilers QoI Keith Thompson <kst-u@mib.org> - 2017-03-14 12:05 -0700
  Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-14 09:35 -0700
    Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 17:08 +0000
      Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-14 10:24 -0700
        Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 17:34 +0000
        Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-14 11:55 -0700
          Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 19:03 +0000
            Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 19:06 +0000
            Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-14 12:10 -0700
              Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 21:14 +0000
                Re: C Compilers QoI already5chosen@yahoo.com - 2017-03-14 14:42 -0700
                Re: C Compilers QoI supercat@casperkitty.com - 2017-03-14 14:53 -0700
                Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 23:20 +0000
                Re: C Compilers QoI antispam@math.uni.wroc.pl - 2017-03-15 02:43 +0000
  Re: C Compilers QoI jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-14 19:39 +0100
    Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-14 19:10 +0000
  Re: C Compilers QoI antispam@math.uni.wroc.pl - 2017-03-14 19:29 +0000
  Re: C Compilers QoI Noob <root@127.0.0.1> - 2017-03-15 09:27 +0100
  Re: C Compilers QoI ed_davis2@yahoo.com - 2017-03-16 15:10 -0700
    Re: C Compilers QoI BartC <bc@freeuk.com> - 2017-03-16 23:19 +0000

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