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-   -   Broadwell new instructions (https://www.mersenneforum.org/showthread.php?t=19469)

tha 2014-07-06 19:04

Broadwell new instructions
 
Broadwell will again introduce new instructions. See [URL="http://www.intel.nl/content/dam/www/public/us/en/documents/white-papers/ia-large-integer-arithmetic-paper.pdf"]the white paper.[/URL]

They mention use for some elliptic curve method. How might it affect prime95?

kracker 2014-07-06 19:26

[QUOTE=tha;377514]Broadwell will again introduce new instructions. See [URL="http://www.intel.nl/content/dam/www/public/us/en/documents/white-papers/ia-large-integer-arithmetic-paper.pdf"]the white paper.[/URL]

They mention use for some elliptic curve method. How might it affect prime95?[/QUOTE]

Where does it say broadwell in the paper?

tha 2014-07-06 21:05

[QUOTE=kracker;377517]Where does it say broadwell in the paper?[/QUOTE]

Nowhere, I just found some sites here and there that say that adox, adcx and mulx will be introduced in Broadwell.

henryzz 2014-07-06 21:36

[QUOTE=tha;377514]Broadwell will again introduce new instructions. See [URL="http://www.intel.nl/content/dam/www/public/us/en/documents/white-papers/ia-large-integer-arithmetic-paper.pdf"]the white paper.[/URL]

They mention use for some elliptic curve method. How might it affect prime95?[/QUOTE]
They actually mention elliptic curve cryptography.
Hopefully gmp should gain some speed from this. That should help gmp-ecm.

tului 2014-07-07 03:35

I keep writing to Intel as a veteran/developer(sort of stretching the dev part). And they won't send me squat. I'd like a Phi

fivemack 2014-07-12 16:52

Phis are readily available items of commerce; there are a couple of ES ones available on ebay at less than $1000 (e.g. [URL]http://www.ebay.co.uk/itm/Intel-Xeon-Phi-5110P-1-053GHz-60x512kb-8-way-PCIe-x16-CoProcessor-/221451202170?pt=CPUs&hash=item338f852e7a[/URL])

My guess is that the 'Intel Xeon Phi Coprocessor Architecture and Tools' and 'Intel Xeon Phi Coprocessor High Performance Programming' books were handed out at some conference and not all the recipients wished to love them and cherish them forever, so they're about $50 from ebay.

You'll need ICC, which is 30-day eval or $700; I imagine Intel might be readier to hand out compiler licenses than they are to hand out hardware.

ewmayer 2014-07-18 00:08

[QUOTE=tha;377538]Nowhere, I just found some sites here and there that say that adox, adcx and mulx will be introduced in Broadwell.[/QUOTE]

MULX is available already in Haswell, though [url=http://en.wikipedia.org/wiki/Haswell_%28microarchitecture%29]Wikipedia appears unaware[/url] of the fact.
ADOX/ADCX, RDSEED and PREFETCHW are new in Broadwell. (The latter instruction is a belated mimicry of AMD's 3DNow! prefetch, not sure why Intel decided that [a] it was a good idea to add it and [b] to wait this long to do so.)


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