Converting MSVC to intel-style gcc inline assembly

[Matthew Tippett]

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
> 
>