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• #254 Oliverda Topikgazda

  2010-04-22 21:35:52 #254

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  Oliverda

  Topikgazda

  1) A reasonably large new block next to the FP register file.
  2) Something what could be a new 3-way extra decoding stage in front of the FP units.
  3) The large increase in size of the reorder buffer (3x24 to 3x32 or 3x36)

  

  -It would be faster even if it's still using 128 bit hardware for the 256 bit
  operations since typically many time slots are unused in FP units.

  -The AVX performance would be ultimately limited by the cache bandwidth
  to/from the SSE/AVX units (32 byte/cycle versus 48 byte/cycle for Sandy
  Bridge)

  -The 256 bit operations would be split into independent 128 bit operations
  which would explain the increase in size of the reorder buffer.

  -The size of the 3-way decode pack stage in front of the Integer units
  has also increased also suggesting that something is added to the
  decoding units (cache access for 2x128 bit words?)

  Some extra points:

  The second level TLB units for the data cache have been doubled from
  512 entries to 1024 entries.

  There is extra integer logic. A good guess would be a faster version
  of the Integer divider. One that can produce multiple result bits/cycle
  like the ones in the Core2 and Nehalem architecture.

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