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| `MIPSThreadStart -> (y_reg, y_sreg)
| `MIPSRType (op, rd, rs, rt) -> fold_reg rt (fold_reg rs (fold_reg rd (y_reg, y_sreg)))
| `MIPSIType (op, rs, rt, imm) -> fold_reg rs (fold_reg rt (y_reg, y_sreg))
| `MIPSShiftI (op, rd, rt, imm) -> fold_reg rt (fold_reg rd (y_reg, y_sreg))
| `MIPSShiftV (op, rd, rt, rs) -> fold_reg rs (fold_reg rt (fold_reg rd (y_reg, y_sreg)))
| `MIPSMulDiv (op, rs, rt) -> fold_reg rs (fold_reg rt (y_reg, y_sreg))
| `MIPSMFHiLo (op, rs) -> fold_reg rs (y_reg, y_sreg)
| `MIPSLUI (rt, imm) -> fold_reg rt (y_reg, y_sreg)
| `MIPSLoad (width, signed, linked, base, rt, offset) -> fold_reg rt (fold_reg base (y_reg, y_sreg))
| `MIPSStore (width, conditional, base, rt, offset) -> fold_reg rt (fold_reg base (y_reg, y_sreg))
| `MIPSLSLR (store, double, left, base, rt, offset) -> fold_reg rt (fold_reg base (y_reg, y_sreg))
| `MIPSSYNC -> (y_reg, y_sreg)
| `MIPSBEQ (rs, rt, offset, ne, likely) -> fold_reg rs (fold_reg rt (y_reg, y_sreg))
| `MIPSBCMPZ (rs, offset, cmp, link, likely) -> fold_reg rs (y_reg, y_sreg)
| `MIPSJ (offset) -> (y_reg, y_sreg)
| `MIPSJAL (offset) -> fold_reg (IReg(R31)) (y_reg, y_sreg)
| `MIPSJR (rd) -> fold_reg rd (y_reg, y_sreg)
| `MIPSJALR (rd, rs) -> fold_reg rd (fold_reg rs (y_reg, y_sreg))
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