ack/mach/i86/libem/mli4.s

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.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
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.define .mli4
yl=2
yh=4
! x * y
! xl in ax
! xh in dx
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.mli4:
mov bx,sp
push dx
mov cx,ax
mul yh(bx) ! xl*yh
pop dx
push ax
mov ax,dx
mul yl(bx) ! xh * yl
pop dx
add dx,ax ! xh*yl+xl*yh
mov ax,cx
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mov cx,dx
mul yl(bx) ! xl*yl
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add dx,cx
ret 4