32b_mul_proc.exe.~asm

收录了一些简单经典的asm程序有源码

name 32 bit multiply
data segment
mulnum dw 0ffffh, 0ffffh, 0ffffh, 0ffffh, 4 dup(?)
data ends

stack segment para stack'stack'
db 100 dup(?)
stack ends

code segment
assume cs:code,ds:data,ss:stack,es:data
start proc far
begin: push ds
mov  ax,0
push ax
mov  ax,data
mov  ds,ax
mov  es,ax
lea  bx,mulnum
call mulu32
call mulu32
call mulu32
ret
start endp

mulu32 proc near
mov  ax,[bx]
mov  si,[bx+4]
mov  di,[bx+6]
mul  si
mov  [bx+8],ax
mov  [bx+0ah],dx
mov  ax,[bx+2]
mul  si
add  ax,[bx+0ah]
adc  dx,0
mov  [bx+0ah],ax
mov  [bx+0ch],dx
mov  ax,[bx]
mul  di
add  ax,[bx+0ah]
adc  dx,[bx+0ch]
mov  [bx+0ah],ax
mov  [bx+0ch],dx
pushf
mov  ax,[bx+2]
mul  di
popf
adc  dx,0
add  ax,[bx+0ch]
adc  dx,0
mov  [bx+0ch],ax
mov  [bx+0eh],dx
ret
mulu32 endp

code ends
end begin



; [SOURCE]: L:\微机原理\2006-2007\ASM_Code\32bit_mult_proc.asm