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

[Emil Lenngren]

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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