[Gambas-user] "shared library" (with inline assembler code) is slow...

[Emil Lenngren]

... And how big is the difference if you put in 2 billion instead? :)

2012/6/3 Ru Vuott <vuott at ...325...>

> Excuse me, Emil, I have written a mistake:
> well, if I send 1 billion with script in terminal, I receive about: ms 570
>
> with shared library in gambas I confirm about. 655
>
>
> Difference: ms 100
>
>
>
>
> --- Dom 3/6/12, Emil Lenngren <emil.lenngren at ...626...> ha scritto:
>
> > Da: Emil Lenngren <emil.lenngren at ...626...>
> > Oggetto: Re: [Gambas-user] "shared library" (with inline assembler code)
> is slow...
> > A: "mailing list for gambas users" <gambas-user at lists.sourceforge.net>
> > Data: Domenica 3 giugno 2012, 01:10
> > What happens if you put 2 billions
> > instead?
> >
> > 2012/6/3 Ru Vuott <vuott at ...325...>
> >
> > > If I run that code via script in my Terminal, passing
> > to it a value of 1
> > > billion (it has to count from 0 to 1 billion), I have a
> > result about 60
> > > millisecond.
> > > If I create a shared library, and I use it in Gambas
> > (...passing 1
> > > billion...), in gambas console I have about 655
> > millisecond !!!  :-O
> > >
> > > ...I do not understand why....
> > >
> > >
> > >
> > >
> > > --- Dom 3/6/12, Emil Lenngren <emil.lenngren at ...626...>
> > ha scritto:
> > >
> > > > Da: Emil Lenngren <emil.lenngren at ...626...>
> > > > Oggetto: Re: [Gambas-user] "shared library" (with
> > inline assembler code)
> > > is slow...
> > > > A: "mailing list for gambas users" <
> gambas-user at lists.sourceforge.net>
> > > > Data: Domenica 3 giugno 2012, 01:02
> > > > Is the function itself slow or is it
> > > > slow because of the call overhead of
> > > > libffi?
> > > >
> > > > /Emil
> > > >
> > > > 2012/6/3 Ru Vuott <vuott at ...325...>
> > > >
> > > > > Hello Benoit,
> > > > >
> > > > > simply for a test I've made this simple C
> > "shared
> > > > library" .so (with
> > > > > inline assembler code). I noted that if I use
> > it from a
> > > > Gambas program
> > > > > (with Extern) it's very slow. Why?
> > > > >
> > > > > static unsigned int car asm("raxregistro");
> > > > > static unsigned int cbr asm("rbxregistro");
> > > > > int hello(int numero) {
> > > > > cbr=numero;
> > > > > asm("mov rbxregistro(%rip),%eax");
> > > > > asm("ciclo:");
> > > > > asm("dec %eax");
> > > > > asm("jne ciclo");
> > > > > asm("mov %eax,raxregistro(%rip)");
> > > > > return car;
> > > > > }
> > > > >
> > > > > Bye
> > > > >
> > > > >
> > > > >
> > > >
> > >
> >
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