on Tue Jan 20 2009, "David A. Greene" <greened-AT-obbligato.org> wrote:
On Tuesday 20 January 2009 06:58, David Abrahams wrote:
Actually, I think you're missing the point (at least from what I'm saying).
I'm saying SIMD code generation ought to be the job of the compiler(s) for the platforms where they make sense.
Why are these SIMD operations different in that respect from, say, large matrix multiplications?
A matrix multiplication is a higher-level construct. Still, most compilers will pattern-match matrix multiplication to an optimal routine.
Not hardly. No compiler is going to introduce register and cache-level blocking.
SIMD code generation is extremely low-level. Programmers want to think in a higher level.
Naturally. But are the algorithms implemented by SIMD instructions lower-level than std::for_each or std::accumulate? If not, maybe they deserve to be in a library. -- Dave Abrahams BoostPro Computing http://www.boostpro.com