I don't know what cpu this was on , but it's good news :)
I'll be adding ecm-6.4.2 to our standard app tests.
Jason
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Hi,
GMP-ECM 6.4.2 has been released. It fixes two major issues with 6.4.1, one
with the copyright headers which were not updated to GPL or LGPL 3, the other
one was a bug in modular reduction which could occur for numbers larger than
386 digits on 64-bit computers and 193 digits on 32-bit computers.
In addition 6.4.2 is significantly faster in stage 2, especially when
configured with MPIR:
frite% /users/caramel/logiciels/ecm-6.4.1/x86_64/bin/ecm -batch 11e6 < c254
GMP-ECM 6.4.1 [configured with MPIR 2.5.1, --enable-asm-redc] [ECM]
Input number is
33852066257429811148979390609187539760850944806763555795340084882048986912482949506591909041130651770779842162499482875755533111808276172876211496409325473343590723224081353129229935527059488811457730702694849036693756201766866018562295004353153066430367
(254 digits)
Using B1=11000000, B2=35133391030, polynomial Dickson(12),
A=61791912275756746987051077680849909976047112464401910060528913901126189401223521697261382806451479323214114826798836318819919081246627349328599964269380726596611326498563058321977482587156286833636551692048951438965687041501590888442276928996275783444190
Step 1 took 49791ms
Step 2 took 23221ms
frite% /users/caramel/logiciels/ecm-6.4.2/x86_64/bin/ecm -batch 11e6 < c254
GMP-ECM 6.4.2 [configured with MPIR 2.5.1, --enable-asm-redc] [ECM]
Input number is
33852066257429811148979390609187539760850944806763555795340084882048986912482949506591909041130651770779842162499482875755533111808276172876211496409325473343590723224081353129229935527059488811457730702694849036693756201766866018562295004353153066430367
(254 digits)
Using B1=11000000, B2=35133391030, polynomial Dickson(12),
A=75849653585490503321987591214534400313240215629414883186388854620671150627349873766786106435325958670440466120704504095970840641568270719374950959219711966087318703578889159597902062872180349083196105419254670032891118191928541988747130527559327562269926
Step 1 took 49811ms
Step 2 took 21873ms
We strongly recommend to upgrade to GMP-ECM 6.4.2.
Paul Zimmermann
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