[汇编版]二分查找法

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# \[汇编版\]二分查找法 #

[Binhua Liu][]

[![blogicon\_011\_thumb][blogicon_011_thumb]][blogicon_011_thumb_blogicon_011_thumb]

二分查找法(Binary Search)大家都很熟悉，我就不介绍算法了，下面是我用汇编实现的二分查找法，采用的编译环境是Visual Studio2008，部署环境请参考<[用Visual Studio 2008编写Win32汇编程序][Visual Studio 2008_Win32]>。

TITLE Binary Search 
    .386
    .MODEL flat,stdcall
    ExitProcess PROTO, dwExitCode:DWORD
    
    .data
    Numbers DWORD 1,3,7,9,12,13,34,35,88,999,1011,1013
    LEN     DWORD ($-Numbers)/4
    
    .code
    main PROC
        mov EBX, OFFSET Numbers
        mov ECX, LEN
        mov EDX,3
        call BinarySearch 
    main ENDP
    
    ;----------------------------------
    BinarySearch PROC
    ;Search specific value from the array through binary search, return the index
    ;Receive: EBX is a pointer that point to the array, ECX is the len of array,

;         EDX is the value that we try to find out
    ;Return: EAX is the index of the  searched value
    ;----------------------------------
        push ECX
        push ESI
        push EDI
        
        ;check parameters
        CMP EBX,0
        JZ  FAIL
        CMP ECX,0
        JZ  FAIL
    
       ;ESI will be used as the head index of the searched array, EDI will be used as the tail index of the searched array
        mov ESI,0
        mov EDI,ECX
        Dec EDI
        
        ;Begin to search 
        ;ECX will be used as the middle index, it is equal (ESI+EDI)/2; 
        ;EAX will be used as the value that ECX point to
     L1:
        mov ECX,0
        mov ECX,ESI
        add ECX,EDI
        SAR ECX,1
        mov EAX,[EBX+ECX*4]
        CMP EAX,EDX
        JZ SUCCESS
        ;If ESI==EDI,and the search value haven't found out, go to FAIL
        CMP ESI,EDI
        JZ FAIL
        CMP EAX,EDX
        JG GREATER
        
        ;if EAX<EDX
        Mov ESI,ECX
        Inc ESI
        jmp L1
        
        ;if EAX>EDX
    GREATER:
        MOV EDI,ECX
        Dec ESI
        jmp L1
    
    SUCCESS:
        Mov EAX,ECX
        jmp FINISH
    
    FAIL:
        Mov EAX,-1
        jmp FINISH
    
    FINISH:
        pop EDI
        pop ESI
        pop ECX
    
    ret
    BinarySearch ENDP
    
    END main

### [![blogicon\_011\_thumb][blogicon_011_thumb]][blogicon_011_thumb_blogicon_011_thumb]声明 ###

本文为Binhua Liu原创作品。本文允许复制，修改，传递，但不允许用于商业用途。转载请注明出处。本文发表于2010年7月14日。

转载于:https://www.cnblogs.com/Binhua-Liu/archive/2010/07/14/1777084.html

[Binhua Liu]: http://www.cnblogs.com/Binhua-Liu
[blogicon_011_thumb]: https://images.cnblogs.com/cnblogs_com/Binhua-Liu/WindowsLiveWriter/f2690175a806_9B8B/blogicon_011_thumb_thumb.png
[blogicon_011_thumb_blogicon_011_thumb]: /images/20211109/a0d171de17c8463e814a9db9af375338.png
[Visual Studio 2008_Win32]: http://www.cnblogs.com/Binhua-Liu/archive/2010/07/13/1776852.html