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[/] [ao486/] [trunk/] [rtl/] [ao486/] [commands/] [CMD_LAHF_CBW_CWD.txt] - Blame information for rev 7

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Line No. Rev Author Line
1 2 alfik
 
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`define CMD_LAHF        #AUTOGEN_NEXT_CMD
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`define CMD_CBW         #AUTOGEN_NEXT_CMD
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`define CMD_CWD         #AUTOGEN_NEXT_CMD
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dec_ready_one && decoder[7:0] == 8'h9F
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`CMD_LAHF
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SET(consume_one);
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dec_ready_one && decoder[7:0] == 8'h98
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`CMD_CBW
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SET(consume_one);
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dec_ready_one && decoder[7:0] == 8'h99
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`CMD_CWD
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SET(consume_one);
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IF(rd_cmd == `CMD_LAHF || rd_cmd == `CMD_CBW || rd_cmd == `CMD_CWD);
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    SET(rd_req_eax, rd_cmd != `CMD_CWD);
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    SET(rd_req_edx, rd_cmd == `CMD_CWD);
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ENDIF();
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IF(wr_cmd == `CMD_LAHF);
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    SAVE(eax, { eax[31:16], sflag, zflag, 1'b0, aflag, 1'b0, pflag, 1'b1, cflag, eax[7:0] });
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ENDIF();
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IF(wr_cmd == `CMD_CBW);
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    IF(wr_operand_32bit);   SAVE(eax, { {16{eax[15]}}, eax[15:0] });
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    ELSE();                 SAVE(eax, { eax[31:16], {8{eax[7]}}, eax[7:0] });
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    ENDIF();
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ENDIF();
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IF(wr_cmd == `CMD_CWD);
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    IF(wr_operand_32bit);   SAVE(edx, {32{eax[31]}});
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    ELSE();                 SAVE(edx, { edx[31:16], {16{eax[15]}} });
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    ENDIF();
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ENDIF();
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