John Bradford wrote:
> Could we not take this idea to it's logical extreme, and simply
> calculate the results of every opcode, on every value, for every state
> of all of the registers, and store them in an array of DIMMs, and
> simply look up the necessary results? I.E. a cpu which is one _huge_
> look up table :-).
You can, if you can keep the internal state sufficiently small.
Say we want to keep the internal state down to 32 bit,
using a 16GB lookup table. (4G*32bit)
What would the state be? Perhaps one general-purpose
8-bit register, a 16-bit program counter and
8 bits left for the current opcode & flags.
Less opportunities than a 6502, but it'd sure be fast.
Helge Hafting
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This archive was generated by hypermail 2b29 : Wed Apr 30 2003 - 22:00:20 EST