Paul Mackerras ec2fa61792 execute1: Reduce width of the result mux to help timing ...

This reduces the number of different things that are assigned to
the result variable.

- The computations for the popcnt, prty, cmpb and exts instruction
  families are moved into the logical unit.
- The result of mfspr from the slow SPRs is computed in 'spr_val'
  before being assigned to 'result'.
- Writes to LR as a result of a blr or bclr instruction are done
  through the exc_write path to writeback.

This eases timing considerably.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

2020-06-15 19:08:58 +10:00

38 KiB

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