68080 Core - Superscalar
Overview
APOLLO Core is a pipelined CPU, so that it can use 2 pipes.
APOLLO Core can use Instruction Fusing whenever possible.
APOLLO Core can use Instruction Bonding whenever possible.
With Pipeline, Fusing and Bonding, the core can execute up to 4 instructions per clock cycle.
Description
| Feature | Pipe 1 | Pipe 2 | Notes |
|---|---|---|---|
| All instructions | X | _ | Pipe2 cannot execute all instructions. |
| 1 cycle instructions | X | X | Pipe2 can only do instructions which finish in 1 single clock. |
| More than 1 cycle instructions | X | _ | Pipe2 cannot do MOVEM, CMPM, MOVE (mem),(mem), MUL, DIV, for example. |
| 8-bytes instructions | X | X | Pipe2 can do instructions of length 8 bytes. |
| More than 8-bytes instructions | X | _ | Pipe2 can max do instructions of length 8 bytes. |
| Flags dependent-instructions | X | _ | Pipe2 is never allowed to depend on flags created by Pipe1. |
| Fuse two instructions | X | X | Both pipes can fuse two instructions whenever possible. |
| Bond two instructions | X | X | Both pipes can bond two instructions whenever possible. |
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Last modified: le 2020/08/02 12:37
