16 SSE2 registers vs. 8 can still make a little difference.
I also thought about an implementation using SSE3. Prime95 is doing two independent butterflies in the low and high halves of a SSE2 register. Having better fitting instructions without costly PSHUFD shuffling together with 16 registers could make it possible to use higher radix butterflies, which causes less loading and storing.
M. Waldhauer
Nuutti Kuosa wrote:
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]
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