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`define CMD_XADD    #AUTOGEN_NEXT_CMD

`define CMDEX_XADD_FIRST        4'd0

`define CMDEX_XADD_LAST         4'd1

dec_ready_2byte_modregrm && { decoder[7:1], 1'b0 } == 8'hC0

prefix_group_1_lock && `DEC_MODREGRM_IS_MOD_11

`CMD_XADD

IF(decoder[0] == 1'b0); SET(dec_is_8bit); ENDIF();

SET(consume_modregrm_one);

SET(dec_is_complex);

`CMDEX_XADD_FIRST

LAST(`CMDEX_XADD_LAST);

IF(rd_cmd == `CMD_XADD && rd_cmdex == `CMDEX_XADD_FIRST);

    SET(rd_src_is_reg);

    // dst: reg, src: reg

    IF(rd_modregrm_mod == 2'b11);

        SET(rd_dst_is_rm);

        IF(rd_mutex_busy_modregrm_reg || rd_mutex_busy_modregrm_rm); SET(rd_waiting); ENDIF();

    ENDIF();

    // dst: memory, src: reg

    IF(rd_modregrm_mod != 2'b11);

        SET(rd_dst_is_memory);

        IF(rd_mutex_busy_modregrm_reg || rd_mutex_busy_memory); SET(rd_waiting);

        ELSE();

            SET(read_rmw_virtual);

            IF(~(read_for_rd_ready)); SET(rd_waiting); ENDIF();

        ENDIF();

    ENDIF();

ENDIF();

IF(rd_cmd == `CMD_XADD && rd_cmdex == `CMDEX_XADD_LAST);

    SET(rd_dst_is_reg);

    SET(rd_req_reg);

    SET(rd_req_eflags);

    SET(rd_req_rm,      rd_modregrm_mod == 2'b11);

    SET(rd_req_memory,  rd_modregrm_mod != 2'b11);

ENDIF();

IF(exe_cmd == `CMD_XADD && exe_cmdex == `CMDEX_XADD_FIRST);

    SET(exe_arith_index, (`ARITH_VALID | `ARITH_ADD));

    SET(exe_result,  exe_arith_add[31:0]);

    SAVE(exe_buffer, dst);

ENDIF();

IF(exe_cmd == `CMD_XADD && exe_cmdex == `CMDEX_XADD_LAST);

    SET(exe_result, exe_buffer);

ENDIF();

IF(wr_cmd == `CMD_XADD && wr_cmdex == `CMDEX_XADD_FIRST);

    IF(wr_dst_is_memory && ~(write_for_wr_ready)); SET(wr_waiting); ENDIF();

    SET(write_regrm,             wr_dst_is_rm);

    SET(write_rmw_virtual,       wr_dst_is_memory);

    SAVE(zflag, zflag_result);

    SAVE(sflag, sflag_result);

    SAVE(pflag, pflag_result);

    SAVE(aflag, aflag_arith);

    SAVE(cflag, cflag_arith);

    SAVE(oflag, oflag_arith);

    SET(wr_not_finished);

ENDIF();

IF(wr_cmd == `CMD_XADD && wr_cmdex == `CMDEX_XADD_LAST);

    IF(wr_modregrm_mod != 2'b11 || wr_modregrm_reg != wr_modregrm_rm);

        SET(write_regrm);

    ENDIF();

ENDIF();