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<Shinmera>
beach: I think Krystof was recently doing stuff with doing flops in software for SBCL cross-implementation building reasons
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<beach>
I see. Thanks. I'll check with him.
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<Krystof>
Hi
<Krystof>
core-math is the INRIA project? What I saw of the blurb looked good, but for the building-sbcl constraint it was too much, so instead I implemented IEEE754 in software, plus just enough of some transcendental functions to get sbcl to build
<ixelp>
sbcl/src/code/cross-early.lisp at master · sbcl/sbcl · GitHub
<Krystof>
(meeting, bbl)
<beach>
Krystof: I see. Different objectives.
<beach>
And, yes, core-math is from INRIA.
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<younder>
beach: I've been spending the last moth improving the tablet interface for linux. It always annoyed me that the only coordinate system it would accept was screen coordinates not widows relative coordinates so I decided to do something about it.
<younder>
Now that I have finished (almost) it is time to get back to the Lisp compiler
<beach>
I see.
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<Krystof>
In my last consideration of floating point and core-math, I came to the conclusion that it was a difference in degree rather than in kind, because knowing that f(x) and g(x) are correctly rounded to the appropriate precision doesn't guarantee much about the subsequent use of f(x) and g(x): for example, their composition need not be correctly rounded, or their sum, or...
<Krystof>
then the fact that core-math implementations have good performance is nice, but the fact that they don't provide exceptional case behaviour is not so nice
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<dlowe>
your compiler would have to be Very Smart indeed to guarantee a stable outcomes through different compositions
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<younder>
Numerical performance is very difficult to balance that is why you have companies specializing in numerical analysis like NAG
<younder>
If you have no experience I would suggest you use a commercial library
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<aeth>
using Wikipedia's algorithms are usually good enough for floating point stuff, at least until you subtract two floats somewhere else and mess things up
<aeth>
but at least you know where the problem isn't
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<aeth>
the thing about computers is that they're ridiculously fast as of the late 2010s so most of the time you can just use the more correct, slower approach that people don't use because it's slower... because that collective wisdom is probably from circa 2000
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<aeth>
on balancing numerical performance... the complicated, hard to discover numerical stuff seems to mostly be between the more naive/basic stuff (e.g. Euler's method) and the "slow" stuff (e.g. Runge-Kutta 4), which probably matters if you're targeting a Pentium III
<aeth>
people who specialize in this sort of thing write long blog posts and yet I just go with RK4
<wbooze>
threre's FPU and also simd, apart from ieee754