Re: Converting MSVC to intel-style gcc inline assembly

[Matthew Tippett <matthew dot tippett at sympatico dot ca>]

Thanks, that makes a perl script just that little bit more possible.

I can't force others to move from MSVC assembly, but I should be 
able to get people to have/maintain comments like ;; clobber-eax.
If that is necessary.  Variable names can be tweaked slightly as 
well in_varname and out_varname can provide input on to which 
variables are input and output.

Thanks a lot!

Regards,

Matthew

Andi Kleen wrote:
> Matthew Tippett <matthew.tippett@sympatico.ca> writes:
>
>
> > Now, although i can handle coverting the body of code over, the
> > parameter passing is going to cause some problems.  Since the gcc
> > supports intel style assembly, it simplifies it down to
> >
> > 	__asm {	-->   __asm__ (
> > 	eax	--> %%eax
> >
> > And so on, (which can be scripted), is there any easy way of
> > automating the conversion from the inline variable use to the
> > parameter syntax %1, %2, %3 that gcc requires.  With a little bit of
>
>
> Newer gcc supports named arguments:
>
>       asm("movl %[arg1],..." :: [arg1] "r" (argument1)); 
>
> This may be easier to port and is in general less error prone.  Also
> note that gcc inline assembly has some unique quirks, like it's not
> possible to clobber %ebp or the PIC register in -fPIC code. You just
> get silently wrong code, but no error message in older gccs.
>
> -Andi