I know this is not much info to go on, but a vendor of ours at work recently compiled their 32-bit FFT code as 64-bit, and they claimed to see a 3x speedup. They were completely astonished, and attributed to all extra registers available in 64-bit mode. I can't say much more on this without getting lots of permissions (I work for a large oil and gas company). I don't know which FFT libraries they were using, and also don't know if it was on Intel's EM64T or AMD x86-64. If there is much interest, I can try to dig deeper.
B.J. Guillot -----Original Message----- From: Nuutti Kuosa <[EMAIL PROTECTED]> Subj: RE: [Prime] 64 Bit version of prime95? Date: Tue Mar 22, 2005 5:14 pm Size: 1K To: 'The Great Internet Mersenne Prime Search list' <[email protected]> Not much advantage. Prime95 uses floating point arithmetic. 64-bit integer calculations (EM64T) will speed trial factoring but that's all. Nuutti -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of p k Sent: 22. maaliskuuta 2005 8:53 To: [email protected] Subject: [Prime] 64 Bit version of prime95? Hi All, Was curious if George or someone was going to port the prime95 code into 64 bit arena. AMD has sold its 64 bit instruction set to Intel. And Intel is coming out with EM64T line of processors based on that instruction set soon. http://www.intel.com/technology/64bitextensions/index.htm I was wondering if anyone would care to elaborate on the advantages if any of moving to 64 bit? Thanks All, P. Kelly [EMAIL PROTECTED] _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime Regards, B.J. Guillot _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
