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| `RISCVThreadStart               -> (y_reg, y_sreg)
| `RISCVUTYPE (_, r0, _)          -> fold_reg r0 (y_reg, y_sreg)
| `RISCVJAL (_, r0)               -> fold_reg r0 (y_reg, y_sreg)
| `RISCVJALR (_, r0, r1)          -> fold_reg r0 (fold_reg r1 (y_reg, y_sreg))
| `RISCVBType (_, r0, r1, _)      -> fold_reg r0 (fold_reg r1 (y_reg, y_sreg))
| `RISCVIType (_, r0, r1, _)      -> fold_reg r0 (fold_reg r1 (y_reg, y_sreg))
| `RISCVShiftIop (_, r0, r1, _)   -> fold_reg r0 (fold_reg r1 (y_reg, y_sreg))
| `RISCVRType (r0, r1, r2, _)     -> fold_reg r0 (fold_reg r1 (fold_reg r2 (y_reg, y_sreg)))
| `RISCVLoad (_, r0, r1, _, _, _) -> fold_reg r0 (fold_reg r1 (y_reg, y_sreg))
| `RISCVStore (_, r0, r1, _, _)   -> fold_reg r0 (fold_reg r1 (y_reg, y_sreg))
| `RISCVADDIW (_, r0, r1)         -> fold_reg r0 (fold_reg r1 (y_reg, y_sreg))
| `RISCVSHIFTW (_, r0, r1, _)     -> fold_reg r0 (fold_reg r1 (y_reg, y_sreg))
| `RISCVRTYPEW (r0, r1, r2, _)    -> fold_reg r0 (fold_reg r1 (fold_reg r2 (y_reg, y_sreg)))
| `RISCVLoadRes (_, _, rs1, _, rd)       -> fold_reg rs1 (fold_reg rd (y_reg, y_sreg))
| `RISCVStoreCon (_, _, rs2, rs1, _, rd) -> fold_reg rs2 (fold_reg rs1 (fold_reg rd (y_reg, y_sreg)))
| `RISCVAMO (_, _, _, rs2, rs1, _, rd)   -> fold_reg rs2 (fold_reg rs1 (fold_reg rd (y_reg, y_sreg)))