[Bug 1067] improve fbmmx

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https://bugs.freedesktop.org/show_bug.cgi?id=1067        
   




------- Additional Comments From sandmann at daimi.au.dk  2004-12-23 08:06 -------
> 6. The shift function is replaced by open-coded instances of _mm_srli_pi16 and
> _mm_slli_pi16.

I'd really like to keep the shift function. To me,

   shift (blah, -48)

is much clearer than _mm_slli_si64 (blah, 48), and since the function is inlined
and optimized, gcc doesn't generate any worse code for it when the argument is a
compile time constant.

Other than that, the patch looks fine to me.        
   
   
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