Sujet : Re: Continuations
De : terje.mathisen (at) *nospam* tmsw.no (Terje Mathisen)
Groupes : comp.archDate : 19. Jul 2024, 19:55:47
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v7ecrj$33vqv$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10
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MitchAlsup1 wrote:
On Fri, 19 Jul 2024 14:16:01 +0000, Terje Mathisen wrote:
Back when I first looked at Invsqrt(), I did so because an Computation
Fluid Chemistry researcher from Sweden asked for help speeding up his
reciprocal calculations (sqrt(1/(dx^2+dy^2+dz^2))), I found that by
combining the 1/x and the sqrt and doing three of them pipelind together
(all the water molecules having three atoms), his weeklong simulation
runs ran in half the time, on both PentiumPro and Alpha hardware.
I, personally, have found many Newton-Raphson iterators that converge
faster using 1/SQRT(x) than using the SQRT(x) equivalent.
Yeah, that was eye-opening to me as well, to the level where I consider the invsqrt() NR iteration as a mainstay, it can be useful for both sqrt and 1/x as well. :-)
Terje
-- - <Terje.Mathisen at tmsw.no>"almost all programming can be viewed as an exercise in caching"
Continuations
Re: Continuations