#11666: Upgrade MPFR to 3.1.0
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Reporter: leif | Owner: leif
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-5.0
Component: packages | Keywords: sd32 MPFR spkg wishlist
sd35.5
Work_issues: correct doctests | Upstream: N/A
Reviewer: Paul Zimmermann | Author: Mike Hansen, Jean-Pierre
Flori
Merged: | Dependencies: #12171
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Comment(by jpflori):
From what i saw in randstate, c_random calls
gmp_urandomb_ui(self.gmp_state, 31).
So this has different behaviors on the gmp rand internal state on 32 and
64 bits ?
I expected that it didn't, so that adding a call to c_random() even on 64
bits (just to see, I don't plan on integrating it to Sage, removing the
hack is indeed the right solution) would produce identical behaviors on 32
and 64 bits, whence my request for you to test it (in fact with the hack
and without it, not with a call to c_random added, on 32 bits).
I also had little hope that it could revert the real PNRG to its previous
behavior for a given seed (in order not to break existing code, outside
Sage source tree I mean).
Anyway, if the mpfr code changed, its completely understandable that the
random output changes, even with the same seed, so this is hopeless and
not really harmful (to me at least).
Anyway, if you confirm that you get the same values that I get (with no
call to c_random at all, ie without the hackish section only running on 32
bits currently), I'll post patches to remove the hack section and correct
the doctests.[[BR]]
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11666#comment:50>
Sage <http://www.sagemath.org>
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