Date: Fri, 16 Jul 1999 21:11:46 +0900 From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp> To: dfr@nlsystems.com Cc: jdp@polstra.com, alpha@FreeBSD.ORG Subject: Re: alpha/12623: strtod(3) FPE on alphaev56 Message-ID: <14223.8578.753480.80014H@ett.sat.t.u-tokyo.ac.jp> In-Reply-To: In your message of "Fri, 16 Jul 1999 09:45:35 %2B0100 (BST)" <Pine.BSF.4.10.9907160944230.58023-100000@salmon.nlsystems.com> References: <XFMail.990715215415.jdp@polstra.com> <Pine.BSF.4.10.9907160944230.58023-100000@salmon.nlsystems.com>
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At Fri, 16 Jul 1999 09:45:35 +0100 (BST), Doug Rabson <dfr@nlsystems.com> wrote: > I agree. As long as there is a -mno-ieee option for those programs which > need to squeeze the last drop of performance then this is the right thing > to do. I agree too. However, I'm very suprised when I found -mieee has BIG performance penatly on my system(21164/600MHz). A well-optimized program multiplying two 1000 * 1000 matrixes. % cc -mcpu=ev56 -O2 matrix2a.c % time ./a.out ./a.out 5.95s user 0.10s system 99% cpu 6.052 total % cc -mieee -mcpu=ev56 -O2 matrix2a.c % time ./a.out ./a.out 21.86s user 0.08s system 99% cpu 21.976 total -- /\ Hidetoshi Shimokawa \/ simokawa@sat.t.u-tokyo.ac.jp PGP public key: finger -l simokawa@sat.t.u-tokyo.ac.jp To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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