汇编语言有性能优势，C#有灵活性，组织结构优势。两者结合使用是我的理想。想法是大的组件和类层次使用C#；关键子程序使用汇编DLL。可以从网上下载MASM32工具包。版本可以是8.2或者9.0。我用汇编写了一个DLL。功能是求和整数数组。
.386.model flat, stdcalloption casemap:noneinclude \masm32\include\windows.incinclude \masm32\include\kernel32.incinclude \masm32\include\user32.incincludelib \masm32\lib\user32.libincludelib \masm32\lib\kernel32.lib
.codeLibMain proc hInstDLL:DWORD, reason:DWORD, unused:DWORD .if reason == DLL_PROCESS_ATTACH MOV EAX,TRUE ret .endif retLibMain Endp
SumArray proc StdCall point:DWORD,len:DWORD push esi push ebx mov esi,point mov ebx,len mov eax,[esi]
dec ebx .if ! zero? .repeat add esi,4 add eax,[esi] dec ebx .until zero? .endif
pop ebx pop esi retSumArray endp
End LibMain
我也是刚学的汇编，如果有什么失误的话，就请多指教了。保存为dll.asm之后,点project->build all菜单。已经生成了dll.obj。之后写dll.def文件：
LIBRARY dllEXPORTS SumArray
运行masm32/bin目录下的命令link /subsystem:windows /dll /def:d:/project/asm/dll.def d:/project/asm/dll.obj这样在bin目录下就有了dll.dll文件。（不是很熟，勿笑）
在C#里调用这个dll并不复杂。1.将那个dll.dll拷贝到bin/debug目录下。2.加上using System.Runtime.InteropServices;3.声明外部方法 [DllImport("dll.dll")] public static extern Int32 SumArray(Int32* point, Int32 length);4.调用 sum = SumArray(point, source.Length);5.因为使用了指针，所以需要把类设为unsafe； public unsafe partial class Form16.设定项目的unsafe属性。
我编了段程序测试它的性能：
int [] source = new int [ 100000 ]; Random random = new Random(); for ( int i = 0 ; i < source.Length; i ++ ) { source[i] = random.Next(100); } int sum = 0 ; long start = Environment.TickCount; for ( int time = 0 ; time < 1000 ; time ++ ) { sum = 0; foreach (int v in source) { sum += v; } } long cost = Environment.TickCount - start; Console.WriteLine( " MSIL result={0};cost={1} " , sum, cost); start = Environment.TickCount; for ( int time = 0 ; time < 1000 ; time ++ ) { sum = 0; fixed(int* pstart = source, pend = &source[source.Length-1]) { for (int* pnow=pstart; pnow < pend; pnow++) { sum += *pnow; } } } cost = Environment.TickCount - start; Console.WriteLine( " CSP result={0};cost={1} " , sum, cost); fixed ( int * point = source) { start = Environment.TickCount; for (int time = 0; time < 1000; time++) { sum = CalArray(point, source.Length); } cost = Environment.TickCount - start; Console.WriteLine("MASM result={0};cost={1}",sum,cost); }
跑下来的结果，C#遍历求和平均630毫秒，C#指针求和420毫秒，汇编求和180毫秒。这还没用MMX。原文地址：http://www.cnblogs.com/fujingqiu/ 作者应该是：fujingqiu 吧
转载于:https://www.cnblogs.com/tuyile006/archive/2006/12/06/583702.html
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