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Hi Mihail, > static DecodeStatus CheckNEONConstraint(const MCInst &Inst, unsigned Insn) [...] > ConstraintCheckMethod = "CheckNEONConstraint" In general I like the idea of an instruction-validation method. I think it could also potentially solve the SoftFail/UNPREDICTABLE issues that are looming (and partially resolved for decoding at present). However, I think that to cope

Hello. Sometimes the constraints imposed on an instruction's encoding are too complex to be described in tablegen alone. In such cases a custom decoder method is implemented. This makes sense when the decoding itself is very complex, but it is wasteful to do it only when checking additional constraints. This is because: 1. a custom decoder method has to decode operands, set opcodes, etc. -