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[/] [ao486/] [trunk/] [rtl/] [ao486/] [commands/] [CMD_DIV_IDIV.txt] - Rev 8
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<defines>
`define CMD_DIV #AUTOGEN_NEXT_CMD
`define CMD_IDIV #AUTOGEN_NEXT_CMD
</defines>
<decode>
dec_ready_modregrm_one && { decoder[7:1], 1'b0 } == 8'hF6 && decoder[13:11] == 3'd6
`CMD_DIV
IF(decoder[0] == 1'b0); SET(dec_is_8bit); ENDIF();
SET(consume_modregrm_one);
</decode>
<decode>
dec_ready_modregrm_one && { decoder[7:1], 1'b0 } == 8'hF6 && decoder[13:11] == 3'd7
`CMD_IDIV
IF(decoder[0] == 1'b0); SET(dec_is_8bit); ENDIF();
SET(consume_modregrm_one);
</decode>
<read>
IF(rd_cmd == `CMD_IDIV || rd_cmd == `CMD_DIV);
SET(rd_dst_is_edx_eax);
SET(rd_req_edx_eax, rd_decoder[0]);
SET(rd_req_eax);
// dst: implicit, src: rm
IF(rd_modregrm_mod == 2'b11);
SET(rd_src_is_rm);
IF(rd_mutex_busy_eax || (rd_decoder[0] && rd_mutex_busy_edx) || rd_mutex_busy_modregrm_rm); SET(rd_waiting); ENDIF();
ENDIF();
// dst: implicit, src: memory
IF(rd_modregrm_mod != 2'b11);
IF(rd_mutex_busy_eax || (rd_decoder[0] && rd_mutex_busy_edx) || rd_mutex_busy_memory); SET(rd_waiting);
ELSE();
SET(rd_src_is_memory);
SET(read_virtual);
IF(~(read_for_rd_ready)); SET(rd_waiting); ENDIF();
ENDIF();
ENDIF();
ENDIF();
</read>
<execute>
IF(exe_cmd == `CMD_IDIV || exe_cmd == `CMD_DIV);
SET(exe_result, (exe_is_8bit)? { 16'd0, div_result_remainder[7:0], div_result_quotient[7:0] } :
(exe_operand_16bit)? { div_result_remainder[15:0], div_result_quotient[15:0] } :
div_result_quotient);
SET(exe_result2, div_result_remainder);
IF(exe_div_exception || div_busy); SET(exe_waiting); ENDIF();
ENDIF();
</execute>
<write>
IF(wr_cmd == `CMD_IDIV || wr_cmd == `CMD_DIV);
SAVE(eax, (wr_is_8bit || wr_operand_16bit)? { eax[31:16], result[15:0] } : result);
IF(~(wr_is_8bit));
SAVE(edx, (wr_operand_16bit)? { edx[31:16], result[31:16] } : result2);
ENDIF();
ENDIF();
</write>
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