ProfitPress Mega CDROM2 …eeware (MSDOS)(1992)(Eng)/ProfitPress-MegaCDROM2.B6I/PROG/BASIC/UBAS821.ZIP/ECM1.ASM

Assembly Source File | 1988-09-27 | 2.7 KB | 246 lines

;ECM1
;Sep 1988 by Yuji KIDA
;

    INCLUDE    UB.MAC

;   10 *ECM_SUB
;   20 v6=v4:v7=v5:v8=v4:v9=v5

    @LET    v6,v4
    @LET    v7,v5
    @LET    v8,v4
    @LET    v9,v5

;   30 v12=v6+v7:v13=v6-v7

    @PUSH    v6
    @PUSH    v7
    @ADD
    @POP    v12

    @PUSH    v6
    @PUSH    v7
    @SUB
    @POP    v13

    JMP    SHORT L40

;   40 for I%=1 to len(v3)-1

V3COUNT    DB    ?
    EVEN
V3ADR    DW    ?
V3SEG    DW    ?
V3WORD    DW    ?

L40:
    MOV    BX,v3
    LDS    SI,CS:[BX]    ;adr of counter
    MOV    AX,[SI]
    AND    AX,3FFFH
    MOV    BX,AX        ;counter word length
    MOV    CL,4
    SHL    AX,CL        ;16 ö{
    MOV    CX,AX        ;counter bit length
    SHL    BX,1
    MOV    AX,[BX+SI]    ;HIGHEST WORD(must be <>0)
    INC    CX
L40A:
    DEC    CX
    SHL    AX,1
    JNC    L40A
    DEC    CX        ;LEN-1

    ADD    SI,2
    MOV    AX,[SI]
    SHR    AX,1        ;BIT0 is not needed
    MOV    CS:[V3WORD],AX
    MOV    CS:[V3COUNT],15
    MOV    CS:[V3ADR],SI
    MOV    CS:[V3SEG],DS

L40LP:
    PUSH    CX

;   50    v10=v12^2@v1:v11=v13^2@v1

    @PUSH    v12
    @P2
    @PUSH    v1
    @MOD
    @POP    v10

    @PUSH    v13
    @P2
    @PUSH    v1
    @MOD
    @POP    v11

;   60    v6=v10*v11@v1

    @PUSH    v10
    @PUSH    v11
    @MUL
    @PUSH    v1
    @MOD
    @POP    v6

;         v7=(v10-v11)*(v11+v2*(v10-v11)@v1)@v1

    @PUSH    v10
    @PUSH    v11
    @SUB
    @PUSH    v11
    @PUSH    v2
    @PUSH    v10
    @PUSH    v11
    @SUB
    @MUL
    @PUSH    v1
    @MOD
    @ADD
    @MUL
    @PUSH    v1
    @MOD
    @POP    v7

;   70    v12=v6+v7:v13=v6-v7

    @PUSH    v6
    @PUSH    v7
    @ADD
    @POP    v12

    @PUSH    v6
    @PUSH    v7
    @SUB
    @POP    v13

;   80    if bit(I%,v3)

    SHR    CS:[V3WORD],1
    PUSHF
    DEC    CS:[V3COUNT]
    JNZ    L80A
    MOV    CS:[V3COUNT],16
    LDS    SI,CS:DWORD PTR [V3ADR]
    ADD    SI,2
    MOV    CS:[V3ADR],SI
    MOV    AX,[SI]
    MOV    CS:[V3WORD],AX
L80A:
    POPF
    JC    L90
    JMP    L110

;  90       :then v10=v13*(v4+v5)@v1:v11=v12*(v4-v5)@v1

L90:
    @PUSH    v13
    @PUSH    v4
    @PUSH    v5
    @ADD
    @MUL
    @PUSH    v1
    @MOD
    @POP    v10

    @PUSH    v12
    @PUSH    v4
    @PUSH    v5
    @SUB
    @MUL
    @PUSH    v1
    @MOD
    @POP    v11

; 100          :v4=(v10+v11)^2@v1*v9@v1:v5=(v10-v11)^2@v1*v8@v1

    @PUSH    v10
    @PUSH    v11
    @ADD
    @P2
    @PUSH    v1
    @MOD
    @PUSH    v9
    @MUL
    @PUSH    v1
    @MOD
    @POP    v4

    @PUSH    v10
    @PUSH    v11
    @SUB
    @P2
    @PUSH    v1
    @MOD
    @PUSH    v8
    @MUL
    @PUSH    v1
    @MOD
    @POP    v5

    JMP    L130

;  110       :else v10=v13*(v8+v9)@v1:v11=v12*(v8-v9)@v1

L110:
    @PUSH    v13
    @PUSH    v8
    @PUSH    v9
    @ADD
    @MUL
    @PUSH    v1
    @MOD
    @POP    v10

    @PUSH    v12
    @PUSH    v8
    @PUSH    v9
    @SUB
    @MUL
    @PUSH    v1
    @MOD
    @POP    v11

;  120          :v8=(v10+v11)^2@v1*v5@v1:v9=(v10-v11)^2@v1*v4@v1

    @PUSH    v10
    @PUSH    v11
    @ADD
    @P2
    @PUSH    v1
    @MOD
    @PUSH    v5
    @MUL
    @PUSH    v1
    @MOD
    @POP    v8

    @PUSH    v10
    @PUSH    v11
    @SUB
    @P2
    @PUSH    v1
    @MOD
    @PUSH    v4
    @MUL
    @PUSH    v1
    @MOD
    @POP    v9

; 130 next

L130:
    POP    CX
    DEC    CX
    JZ    L140
    JMP    L40LP

;  140 return

L140:
    RETURN