[PD] Stack overflow / double loop

[jma at jeanmarie-adrien.net]

Hello list
im trying to compute distances between points, and this takes the form of a classical double imbricated loop computing out of a memory where points coordinates are stored.
It has to be fast (no delay in looping)

The loop style is twice counter + moses and i cared a lot about looping at the last moment (means after reading / writing in memory) and not at the top with a (t b b b f) or so : i get a stack overflow though when number of points is over 15 :(
I solved the problem years ago, dont remember how … stuck on this since yesterday

im sure this is really classical ! 
here is the idiosyncratic patch

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Any hint ?
(we love programming)
Tks
JM