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@chinkouu

H27年春期 基本情報技術者 午後問12 解説 掛け算のみ

Last updated at Posted at 2016-03-26
MAIN    START
        LD     GR0,X          ; GR0 ← X（被乗数）
        LD     GR2,Y          ; GR2 ← Y（乗数）
        CALL   MULT
        RET
X       DC     3
Y       DC     5
        RET

MULT    START            ; シフトによる乗算
        RPUSH
        LD     GR1,GR0   ; 被乗数を GR1 に保持
        LD     GR0,=0    ; 乗算結果の初期化

        LD     GR3,=15
        LD     GR2,GR2
LP2     JZE    FIN2
        JPL    CONT
        LD     GR4,GR1
        SLL    GR4,0,GR3
        ADDL   GR0,GR4
CONT    LAD    GR3,-1,GR3
        SLL    GR2,1
        JUMP   LP2
FIN2    RPOP
        RET
        END

11x101=11x100+11x1

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