[PATCH] iWMMXt support was Re: [Ffmpeg-devel] iWMMXt support

Alexander Strange astrange
Thu Mar 15 22:08:04 CET 2007


On Mar 15, 2007, at 6:21 AM, Reimar D?ffinger wrote:

>
> To take gcc as an example: -maltivec or so is needed to use the
> intrinsics (which unfortunately is preferred by the Altivec
> maintainers), but it will also enable Altivec everywhere, including  
> even
> the most simple C code. Thus runtime CPU-detection just can't work.
>
> Greetings,
> Reimar D?ffinger

Apple gcc has a seperate flag "-mabi-altivec", which lets you use  
instrinsics but won't break any code for earlier PPCs.
I don't know if it exists outside OS X.




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