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Message-ID: <20111108190402.GA7514@openwall.com>
Date: Tue, 8 Nov 2011 23:04:02 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: floating-point math after MMX
magnum -
I expect that
0022-j7-Fix-for-huge-figures-in-MPI-sum-avg-cps-64-bit-ov.patch and
0027-j7-Optionally-output-number-of-candidates-tried.patch would cause
misreporting when running MMX-using builds (and formats for which MMX
specifically is actually used) on certain CPUs. I previously observed
this on Pentium 3, for which there's now a workaround in -jumbo's
status.c: status_get_ETA() and status_get_totalETA(), but not in other
functions. Basically, we only issue the EMMS instruction right before
doing floating-point math.
Is this something you can test for (on a P3) and patch now or should I?
Thanks,
Alexander
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