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by hajile 1666 days ago
When they say R64GC, the C is compressed while the G is short for I, M, A, F, D, Z, icsr, and Zifencei.

ARM does something similar. They have TONS of extensions, but then group them into 8.0, 8.1, 8.2, etc then also group them with the A, R, and M designators too.