optimize risc-v emulators #1191
Description
It occupied quite of time when proving huge block. E.g. with > 2^30 cycle inst, for app proof e2e take 750s, emulator could take 250s
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It occupied quite of time when proving huge block. E.g. with > 2^30 cycle inst, for app proof e2e take 750s, emulator could take 250s