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From: | "Dave Korn" <dave DOT korn AT artimi DOT com> |
To: | "'Andrew Makhorin'" <mao AT gnu DOT org>, "'Robin Walker'" <rdhw AT cam DOT ac DOT uk> |
Cc: | <cygwin AT cygwin DOT com>, "'Peter Rosin'" <peda AT lysator DOT liu DOT se> |
References: | <13811889795 DOT 20070215071733 AT gnu DOT org> <er2v5b$nmj$1 AT sea DOT gmane DOT org> <106982500 DOT 20070216041231 AT gnu DOT org> <EE7C6A9E85BF2E3374078A69 AT qjunbur DOT quns DOT cam DOT ac DOT uk> <1433795387 DOT 20070216163624 AT gnu DOT org> |
Subject: | RE: strange bug in gettimeofday function |
Date: | Fri, 16 Feb 2007 15:24:26 -0000 |
Message-ID: | <0d4001c751de$8cba5600$2e08a8c0@CAM.ARTIMI.COM> |
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On 16 February 2007 13:36, Andrew Makhorin wrote: > The irony is that I usually give the same standard explanation about > floating-point to people who do not understand that :) *Unfortunately*, > you are right, and the difference really appears because the second > value returned by get_time being computed with full 80-bit precision > is kept in a fpu register during the comparison while the first value > is stored and then loaded as a 64-bit value. This is the infamous http://gcc.gnu.org/PR323. See in particular comment #60 for a solution (although IIRC _FPU_SETCW doesn't exist on cygwin... maybe I'll see about adding it). cheers, DaveK -- Can't think of a witty .sigline today.... -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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