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Groups > comp.lang.c++ > #80056
| From | Bonita Montero <Bonita.Montero@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: lamda-optimization |
| Date | 2021-06-01 18:42 +0200 |
| Organization | A noiseless patient Spider |
| Message-ID | <s95o2g$io3$1@dont-email.me> (permalink) |
| References | (5 earlier) <s93e5p$5gc$1@redfloyd.dont-email.me> <s94c8r$kpf$2@dont-email.me> <s95afo$1jo0$1@gioia.aioe.org> <s95cev$sus$1@dont-email.me> <9b8b6902-0d0b-4354-b755-b5cee220bf06n@googlegroups.com> |
> I agree ... I was suggesting to not write garbage or to extend compiler
> so that the useless garbage is detected and optimized out. For
> someone sensible these would be constructive suggestions worth
> pursuing. As these were suggested to Bonita Montero who can't
> possibly do neither of those it was total nonsense.
I didn't tell garbage. I just wanted to give the compiler the oppor-
tunity to do the optimization which David said that it wouldn't be
done because there the function wouldn't get compiled.
And I did it right by hiding the lambda behind a volatile-Pointer
so that the lambda couldn't be inline-optimized. I could have done
it also a bit simpler:
#include <iostream>
using namespace std;
int main()
{
int volatile i = 123, j = 456, k = 789;
auto f = [&]() -> int
{
return i + j + k;
};
decltype(f) *volatile pFf = &f;
cout << sizeof *pFf << " " << (*pFf)() << endl;
}
And the result is the same.
Why is this garbage ?
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Re: lamda-optimization red floyd <no.spam.here@its.invalid> - 2021-05-31 12:41 -0700
Re: lamda-optimization Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-01 06:15 +0200
Re: lamda-optimization Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-01 15:24 +0200
Re: lamda-optimization Öö Tiib <ootiib@hot.ee> - 2021-06-01 09:04 -0700
Re: lamda-optimization Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-01 18:42 +0200
Re: lamda-optimization red floyd <no.spam@its.invalid> - 2021-06-01 20:26 -0700
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 05:33 +0200
Re: lamda-optimization Manfred <noname@add.invalid> - 2021-06-01 14:51 +0200
Re: lamda-optimization Juha Nieminen <nospam@thanks.invalid> - 2021-06-01 07:10 +0000
Re: lamda-optimization Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-06-01 10:29 +0100
Re: lamda-optimization MrSpook_x510g@6uikovuenojv.gov.uk - 2021-06-01 18:27 +0000
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 05:10 +0200
Re: lamda-optimization James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-06-02 00:14 -0400
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 07:26 +0200
Re: lamda-optimization Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-06-02 01:47 -0700
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 11:49 +0200
Re: lamda-optimization James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-06-02 09:34 -0400
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 15:50 +0200
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 16:28 +0200
Re: lamda-optimization scott@slp53.sl.home (Scott Lurndal) - 2021-06-02 14:45 +0000
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 17:58 +0200
Re: lamda-optimization James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-06-02 10:14 -0400
Re: lamda-optimization David Brown <david.brown@hesbynett.no> - 2021-06-02 16:19 +0200
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 16:30 +0200
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 16:38 +0200
Re: lamda-optimization David Brown <david.brown@hesbynett.no> - 2021-06-02 17:46 +0200
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 18:00 +0200
Re: lamda-optimization Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-06-02 10:17 -0700
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 19:30 +0200
Re: lamda-optimization Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-06-02 10:11 -0700
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 19:30 +0200
Re: lamda-optimization David Brown <david.brown@hesbynett.no> - 2021-06-02 09:39 +0200
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 10:23 +0200
Re: lamda-optimization "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-02 11:38 -0700
Re: lamda-optimization James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-06-02 10:15 -0400
Re: lamda-optimization Manfred <noname@add.invalid> - 2021-06-02 19:01 +0200
Re: lamda-optimization Doctor Who <doc@tardis.org> - 2021-06-02 19:30 +0200
Re: lamda-optimization "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-02 11:39 -0700
Re: lamda-optimization scott@slp53.sl.home (Scott Lurndal) - 2021-06-02 14:21 +0000
Re: lamda-optimization MrSpook_2TF@zp_6z10zl3.info - 2021-06-03 08:12 +0000
Re: lamda-optimization Juha Nieminen <nospam@thanks.invalid> - 2021-06-02 05:05 +0000
Re: lamda-optimization MrSpook_9na7kf9y25@bv5tkwx.biz - 2021-06-03 08:10 +0000
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