Re: [pygame] [PATCH] Smooth Scaling v2 (pygame.transform.smoothscale)

[Richard Goedeken <SirRichard@xxxxxxxxxxxxxxxxxxxxxxx>]

The "__i386__" preproc definition tells me that the compiler is
compiling for an IA32 CPU, and it will accept MMX instructions, so I can
put them in.  Before calling any of the MMX routines, I've called a
SDL_cpuinfo function which tells me whether or not the currently running
CPU supports MMX, so if someone were to run this on a 486 or non-MMX
Pentium, it won't call the MMX functions.

Unfortunately, Luke, most Windows folks will be running the C routines
and not get the benefit of MMX because I've written the inline ASM in
AT&T-style syntax which is not supported by Visual Studio.  If a Windows
user compiles with GCC, however (with MinGW? or Cygwin), they will get
the MMX code.

Richard


Marcus von Appen wrote:
> On, Sat Jun 23, 2007, Luke Paireepinart wrote:
> 
>>  Christopher Arndt wrote:
>>> Charles Joseph Christie II schrieb:
>>>   
>>>> If I remember correctly, i486 introduced MMX.
>>>>     
>>> No, that was the Pentium MMX, an improved version of the Pentium I (i586).
>>>   
>>  Okay, so then I don't understand how __i386__ helps us.... does it tell us 
>>  that the cpu doesn't support MMX?
> 
> No, it just tells us, that the CPU is likely to be an intel-conpliant
> one.
> 
> Regards
> Marcus