Flute currently bans the compressed hint encodings: at least C.NOP with nzimm != 0 and c.ADDI with nzimm == 0. I'm not sure if this is based on a past version of the spec that reserved these, but the current version seems pretty clear that they should be legal.
I believe deleting the following two lines would fix these cases, but I'm not sure if there are more:
Flute currently bans the compressed hint encodings: at least C.NOP with nzimm != 0 and c.ADDI with nzimm == 0. I'm not sure if this is based on a past version of the spec that reserved these, but the current version seems pretty clear that they should be legal.
I believe deleting the following two lines would fix these cases, but I'm not sure if there are more:
Flute/src_Core/CPU/CPU_Decode_C.bsv
Line 770 in da86cb0
Flute/src_Core/CPU/CPU_Decode_C.bsv
Line 790 in da86cb0