// Copyright Jamie Iles, 2017
//
// This file is part of s80x86.
//
// s80x86 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// s80x86 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with s80x86.  If not, see <http://www.gnu.org/licenses/>.

.at 0xa6;
    jmp cmpsb;

.auto_address;
cmpsb:
    ra_sel DI, rb_cl, jmp_if_not_rep cmpsb_no_rep;
cmpsb_rep_loop:
    ra_sel CX, jmp_rb_zero cmpsb_done;
    ra_sel DI, a_sel RA, b_sel IMMEDIATE, immediate 0x1, alu_op SUB,
        rd_sel_source MICROCODE_RD_SEL, rd_sel CX;
cmpsb_no_rep:
    ra_sel DI, a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, segment ES,
        segment_force;
    width W8, segment ES, segment_force, mem_read,
        a_sel MDR, alu_op SELA, tmp_wr_en;
    a_sel MAR, b_sel IMMEDIATE, immediate 0x1, alu_op NEXT,
        rd_sel_source MICROCODE_RD_SEL, rd_sel DI,
        ra_sel SI;
    a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, segment DS, ra_sel SI;
    a_sel RA, b_sel IMMEDIATE, immediate 0x1, alu_op NEXT,
        rd_sel_source MICROCODE_RD_SEL, rd_sel SI,
        segment DS;
    width W8, segment DS, mem_read;
    width W8, a_sel MDR, b_sel TEMP, alu_op SUB,
        update_flags OF SF ZF CF PF AF, jmp_if_not_rep cmpsb_done;
    rb_cl, alu_op GETFLAGS, ext_int_yield,
        jmp_if_rep_not_complete cmpsb_rep_loop;
cmpsb_done:
    next_instruction;

.at 0xa7;
    jmp cmpsw;

.auto_address;
cmpsw:
    ra_sel DI, rb_cl, jmp_if_not_rep cmpsw_no_rep;
cmpsw_rep_loop:
    ra_sel CX, jmp_rb_zero cmpsw_done;
    ra_sel DI, a_sel RA, b_sel IMMEDIATE, immediate 0x1, alu_op SUB,
        rd_sel_source MICROCODE_RD_SEL, rd_sel CX;
cmpsw_no_rep:
    ra_sel DI, a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, segment ES,
        segment_force;
    segment ES, segment_force, mem_read, a_sel MDR, alu_op SELA, tmp_wr_en,
        ra_sel DI;
    a_sel RA, b_sel IMMEDIATE, immediate 0x2, alu_op NEXT,
        rd_sel_source MICROCODE_RD_SEL, rd_sel DI,
        ra_sel SI;
    a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, segment DS, ra_sel SI;
    a_sel RA, b_sel IMMEDIATE, immediate 0x2, alu_op NEXT,
        rd_sel_source MICROCODE_RD_SEL, rd_sel SI, segment DS;
    segment DS, mem_read, a_sel MDR, b_sel TEMP, alu_op SUB,
        update_flags OF SF ZF CF PF AF, jmp_if_not_rep cmpsw_done;
    rb_cl, alu_op GETFLAGS, ext_int_yield,
        jmp_if_rep_not_complete cmpsw_rep_loop;
cmpsw_done:
    next_instruction;