[PD] gain~

[Krzysztof Czaja]

Tim Blechmann wrote:
>>oh i have forgotten to mention that zexy's [matrix~] and [multiline~] 
>>were written for exactly this purpose... (although not SIMD-optimized)
> 
> and if i remember correctly they are not even loop unrolled / vectorized
> ... haven't checked the code, though ...

neither is sickle version of matrix~, nor any other sickle clone.
When I was experimenting back then with gcc-2.95, the consistent
pattern was that -funroll-loops performed slightly better than
unrolling by hand.

Wonder about similar measurements with -ftree-vectorize once it
matures...

Krzysztof