Optimize predecoder/decoder for illegal compressed instructions (!338) · Merge requests · OpenHW Group / backup-20241120 / cv32e40x

Eclipse Webmaster requested to merge github/fork/silabs-oysteink/silabs-oysteink_compressed-opt into master Dec 01, 2021

Created by: silabs-oysteink

Not all illegal compressed instructions generated an uncompressed instruction word. Fixing this hole enables synthesis to optimize the decoder in ID stage by removing two LSBs.

Not SEC clean due to stalls caused by rs1/rs2 fields in illegal compressed instructions. SEC clean if compressed instruction word is passed through predecoder with two LSB set to 1.

Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com

Optimize predecoder/decoder for illegal compressed instructions

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