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From: Julian S. <js...@ac...> - 2006-01-01 19:13:33
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> It does mean that we would not be able to reproduce a full simulation > under valgrind (i.e. to understand what went wrong in a special case) as > different numerics would rapidly lead to different numbers of iterations > and (chaotic) trajectories (both meaningful runs, but different). However, > I can imagine that getting the fine details of every fpu right is not > really a priority. The real difficulty is to decide where to place the cost/accuracy tradeoff for very detailed FPU simulation. Sure, it's possible to do a more accurate simulation, but you pay an ever-larger simulation overhead for increased accuracy, and it's not clear what is an appropriate tradeoff. For most of the time, I believe the FP implementation is "accurate enough", although I'd be the first to admit we need more feedback, really. J |