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

[Ru Vuott]

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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