[FFmpeg-devel] [flamefest-start] A little something on MMX/SSE intrinsics

Zuxy Meng zuxy.meng
Sat Mar 1 14:26:34 CET 2008


2008/3/1, Michael Niedermayer <michaelni at gmx.at>:
> On Sat, Mar 01, 2008 at 02:09:14PM +0200, Ivan Kalvachev wrote:
> [...]
> > Of course there are architectures like VLIW where you have fixed
> > pre-determined number of instructions that could be grouped together.
> Not that VLIW is the subject but ...
> The compiler generally does not know (gcc even less so) which instructions
> are independant thus it is likely going to mess up worse than a human ...
> A human plain knows what a write over a given pointer will change and
> with what such an instruction can be grouped for a compiler this is not so
> easy to find out (restrict helps but still ...)
> Also i dont know any VLIW arch which has intrinsics ...

IA-64 supports MMX and SSE intrinsics, if you'd call it VLIW.
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