On Fri, Dec 16, 2005 at 03:04:01PM -0800, Matt Ettus wrote: [..] > This would actually be a good place to make use of liboil, the library > of optimized inner loops. They have code for all sorts of conversions, > and they pick up MMX and SSE-type optimizations automatically.
Indeed. liboil is really promising. I was waiting for GNU Radio 2.6 to be released, and provided you and Eric agree, IMHO it would be a smart move to "outsource" the SIMD speedups to liboil for the next GNU Radio release. It's way easier to develop speedups in liboil, introduce new archs, have them improved by people other than the GNU Radio gang (IOW share efforts and benefits), etc. Right now, I'm creating the missing liboil API entries along with reference implementations. Reference implementations are plain C code which implements the algorithm in a clear, readable, high- precision and always right way. Most of the time, reference implementations are horribly slow. But it's not a problem. Based on the reference prototype, you may write as many optimized implementations as you want. The liboil framework makes it easy to automate testing against the reference implementation and corner cases (spill, alignment, ..). Always wondered whether SSE or 3DNow! is faster on some new AMD chip? Don't care about that, liboil benchmarks at run time your breed(1) of optimized implementations and selects the one which has the best rating. (1) not *genetically* engineered so far, sorry Eric ;-) Expect liboil to gain more momentum, and pass the word among the other SDR projects you may be involved in. One thing I will need quickly is the list of inner loops in the need of optimization (OProfile reports anyone?). This is to begin with creating the API entries and the reference implementations. Then, making it familiar to some ears, liboil is "The library that just keeps getting optimized better". > See http://liboil.freedesktop.org/wiki/FrontPage Definitely worth mentioning! -- Stephane _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio