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⚠️ rework CFU (remove R5-type instructions) #971

Merged
merged 14 commits into from
Aug 2, 2024
Merged

⚠️ rework CFU (remove R5-type instructions) #971

merged 14 commits into from
Aug 2, 2024

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stnolting
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Remove CFU support for R5-type instructions.

  • R5-type instruction format is not RISC-V-compliant
  • implementing R5-type instructions increases register file size by 100%; this is disproportionate to the gain in performance when four register operands can be transferred to the CFU simultaneously
  • custom-2 and custom-3 opcodes are reserved now; they are reserved for upcoming NEORV32-specific ISA extensions

@stnolting stnolting added the HW Hardware-related label Aug 2, 2024
@stnolting stnolting self-assigned this Aug 2, 2024
@stnolting stnolting marked this pull request as ready for review August 2, 2024 17:04
@stnolting stnolting changed the title ⚠️ rework CFU (remove R5-tape instructions) ⚠️ rework CFU (remove R5-type instructions) Aug 2, 2024
@stnolting stnolting merged commit 24522d4 into main Aug 2, 2024
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@stnolting stnolting deleted the cfu_rework branch August 2, 2024 18:04
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