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CPU logic optimization #204

Merged
merged 7 commits into from
Nov 14, 2021
Merged

CPU logic optimization #204

merged 7 commits into from
Nov 14, 2021

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stnolting
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@stnolting stnolting commented Nov 13, 2021 •
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Major CPU logic optimization and code clean-ups.

  • closed several illegal instruction word holes (system/environment instructions, ALU instructions, FENCE instructions) - some illegal instruction word combinations were not correctly identified by the CPU
  • reworked ALU (function select muxes)
  • extension-specific instruction decoding logic (like bit-manipulation) is removed from the CPU if the extension is not enabled
  • clean-up of CPU's control engine - simpler states (less logic) and more comments

@stnolting
[rtl/core] ALU: logic optimization
0054489 
reworked function select MUX
@stnolting
[rtl/core] CPU control: major logic optimization
654ec7f 
* optimized control engine
* closed many illegal instruction word holes (now detecting more illegal instruction combinations)
* optimized critical path of CPU counters
@stnolting
[docs/dataseet] CPU: minor edits
a8621ec 
CSR access instructions [Zicsr]
@stnolting
[CHANGELOG] added v1.6.3.7
28383fe
@stnolting stnolting added the HW hardware-related label Nov 13, 2021
@stnolting stnolting self-assigned this Nov 13, 2021
@stnolting stnolting marked this pull request as ready for review November 14, 2021 14:07
@stnolting stnolting merged commit 5bb4782 into master Nov 14, 2021
@stnolting stnolting deleted the cpu_logic_optimization branch November 14, 2021 14:35
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