Re: [boost] [OT?] SIMD and Auto-Vectorization (was Re: How to structurate libraries ?)

Subject: Re: [boost] [OT?] SIMD and Auto-Vectorization (was Re: How to structurate libraries ?)
From: John Maddock (john_at_[hidden])
Date: 2009-01-22 04:12:52

>> Well, the whole discussion is about "optimal."  If one doesn't care about
>> "optimal" then a compiler will do just fine all the time and there's no 
>> need
>> for a DSEL, asm or ugly gcc intrinsics.
>>
>
> What if we replace optimal with optimized?
>
> Surely library code than gives a 4x speedup is desirable to have even if
> you can hand generate code that gives you a 5x. Getting a 4x speedup
> over naive simd-less in simple vector operations and still being able to
> concentrate on the problem at hand instead of low level optimization
> details sounds fantastic to me.

Indeed, and like I keep saying: show us the code that produces the speedup 
and we can all stop arguing and start rejoycing :-)

John.