[Gems-users] OPAL register configurations

["dongjianbo" <dongjianbo@xxxxxxxxx>]

Hi, all

   The opal configurations defined a core with

160+64(rename)                     int registers

   1.     64+128(64 double precision)     fp registers

   2.     5+64                                    cc registers

   3.     57*64(sets)                          control registers

 

   But the problems are as following:

   1. In the sparc v9 architecture manual, the single and double precision fp registers are overlapped.

  Is the opal makes them seperated for simplicity?

   2. Why we need so many(69) cc registers? And is it a kind of control register?

   3. Why we need 64 sets of control registers? Are they used to simulate the stack?

 

   Any help will be appreciated.

   Thanks in advance.

 

2010-07-07

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Jianbo DONG

Key Laboratory of Computer System and Architecture,

Institute of Computing Technology,
Chinese Academy of Sciences,