Re: [boost] [XInt] Some after thoughts about SIMD

Subject: Re: [boost] [XInt] Some after thoughts about SIMD
From: Joel Falcou (joel.falcou_at_[hidden])
Date: 2011-03-11 14:37:17

On 11/03/11 20:29, Simonson, Lucanus J wrote:
> I am basing my opinion on experience with larrabee vector instruction set not SSE.
>
>    http://drdobbs.com/architecture-and-design/216402188?pgno=2
>
> "Vector Arithmetic, Logical, and Shift Instructions
> The arithmetic, logical, and shift vector instructions include everything you'd expect: add, subtract, add with carry, subtract with borrow, multiply, round, clamp, max, min, absolute max, logical-or, logical-and, logical-xor, logical-shift and arithmetic-shift by a per-element variable number of bits, and conversions among floats, doubles, and signed and unsigned int32s."
>
> I'll call out add with carry and subtract with borrow from that list, which is not exhaustive, by the way.  There are a ton of instructions and some are impossible to map an expression to using expression templates due to language limitations.
>
> I said vector instruction sets are a moving target at the outset.  If you are designing based on SSE you are solving yesterday's problems.
Sorry to not have a Larabee to do stuff , really.

More seriously, I fail to see an vector operation that is "limited by 
the language". I have very eager to see the one you speak about.