Joel Falcou wrote:
* Arch.SIMD : a SIMD computation library that provides a small scale binding to internal representation of a SIMD register on SIMD-enabled machine. Using Proto, a small DSEL is provided so one can write code like :
vec<float> k = {5,5,5,5},r; r = ((2*k)/(3-k)).min();
and have vec generate a proper SSEx or Altivec code.
Very interesting. If you need a motivating problem, have a look at the DCT code in libjpeg. I thought about trying to improve this using gcc's SIMD extensions (which I guess you'll use as the back-end of your code on that platform, right?) but quickly decided it was too complicated. (As to the "how to structure libraries?" question, I would prefer to make each independent unit a separate library in its own right, even if they are small. Bundling things up into collection-libraries will tend to hide the contents; see for example today's example of the binary constants feature, hidden inside Boost.Utility, and apparently undiscovered. I suggest that this SIMD code should be its own library, Boost.SIMD.) Phil.