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| `RISCVThreadStart               -> "start"
| `RISCVStopFetching              -> "stop"
| `RISCVUTYPE(imm, rd, op)        -> sprintf "%s %s, %d" (pp_riscv_uop op) (pp_reg rd) imm
| `RISCVJAL(imm, rd)              -> sprintf "jal  %s, %d" (pp_reg rd) imm
| `RISCVJALR(imm, rs, rd)         -> sprintf "jalr %s, %s, %d" (pp_reg rd) (pp_reg rs) imm
| `RISCVBType(imm, rs2, rs1, op)  -> sprintf "%s %s, %s, %d" (pp_riscv_bop op) (pp_reg rs1) (pp_reg rs2) imm
| `RISCVIType(imm, rs2, rs1, op)  -> sprintf "%s %s, %s, %d" (pp_riscv_iop op) (pp_reg rs1) (pp_reg rs2) imm
| `RISCVShiftIop(imm, rs, rd, op) -> sprintf "%s %s, %s, %d" (pp_riscv_sop op) (pp_reg rd) (pp_reg rs) imm
| `RISCVRType (rs2, rs1, rd, op)  -> sprintf "%s %s, %s, %s" (pp_riscv_rop op) (pp_reg rd) (pp_reg rs1) (pp_reg rs2)
| `RISCVLoad(imm, rs, rd, unsigned, width, aq)
                                  -> sprintf "%s %s, %d(%s)" (pp_riscv_load_op (unsigned, width, aq)) (pp_reg rd) imm (pp_reg rs)
| `RISCVStore(imm, rs2, rs1, width, rl)
                                  -> sprintf "%s %s, %d(%s)" (pp_riscv_store_op (width, rl)) (pp_reg rs2) imm (pp_reg rs1)
| `RISCVADDIW(imm, rs, rd)        -> sprintf "addiw %s, %s, %d" (pp_reg rd) (pp_reg rs) imm
| `RISCVSHIFTW(imm, rs, rd, op)   -> sprintf "%s %s, %s, %d" (pp_riscv_sop op) (pp_reg rd) (pp_reg rs) imm
| `RISCVRTYPEW(rs2, rs1, rd, op)  -> sprintf "%s %s, %s, %s" (pp_riscv_ropw op) (pp_reg rd) (pp_reg rs1) (pp_reg rs2)
| `RISCVFENCE(pred, succ)         -> sprintf "fence %s, %s" (pp_riscv_fence_option pred) (pp_riscv_fence_option succ)
| `RISCVLoadRes(aq, rl, rs1, width, rd)
                                  ->
                                    assert (rl = false);
                                    sprintf "%s %s, (%s)"
                                      (pp_riscv_load_reserved_op (aq, rl, width))
                                      (pp_reg rd)
                                      (pp_reg rs1)
| `RISCVStoreCon(aq, rl, rs2, rs1, width, rd)
                                  ->
                                    assert (aq = false);
                                    sprintf "%s %s, %s, (%s)"
                                      (pp_riscv_store_conditional_op (aq, rl, width))
                                      (pp_reg rd)
                                      (pp_reg rs2)
                                      (pp_reg rs1)