1985-02-07 22:06:32 +00:00
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.define .mlu
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1986-07-22 13:37:16 +00:00
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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1985-02-07 22:06:32 +00:00
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! entry : d0 multiplicand
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! d1 multiplier
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! exit : d0 high order result
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! d1 low order result
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1986-07-22 13:37:16 +00:00
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.sect .text
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1985-02-07 22:06:32 +00:00
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.mlu:
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1986-07-22 13:37:16 +00:00
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movem.l d3/d4/d6,-(sp)
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move.l 16(sp),d1
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move.l 20(sp),d0
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1985-02-07 22:06:32 +00:00
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cmp.l #32768,d0
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bgt 1f
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cmp.l #32768,d1
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bls 2f
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1986-07-22 13:37:16 +00:00
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1:
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1985-02-07 22:06:32 +00:00
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move.l d1,d3
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move.l d1,d2
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swap d2
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move.l d2,d4
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mulu d0,d1
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mulu d0,d2
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swap d0
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mulu d0,d3
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mulu d4,d0
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clr.l d6
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swap d1
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add d2,d1
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addx.l d6,d0
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add d3,d1
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addx.l d6,d0
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swap d1
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clr d2
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clr d3
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swap d2
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swap d3
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add.l d2,d0
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1986-07-22 13:37:16 +00:00
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add.l d3,a0
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bra 3f
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1985-02-07 22:06:32 +00:00
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2: mulu d0,d1
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clr d0
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1986-07-22 13:37:16 +00:00
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3:
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movem.l (sp)+,d3/d4/d6
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move.l (sp)+,a0
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add #8,sp
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jmp (a0)
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1985-02-07 22:06:32 +00:00
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.align 2
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