다음 코드는 Visual Studio에서 릴리스를 실행하고 Visual Studio 외부에서 릴리스를 실행할 때 다른 출력을 제공합니다. Visual Studio 2008을 사용하고 .NET 3.5를 대상으로합니다. .NET 3.5 SP1도 시도했습니다.

Visual Studio 외부에서 실행할 때 JIT가 시작됩니다. (a) C #과 관련하여 미묘한 부분이 있거나 (b) JIT에 실제로 오류가 있습니다. 나는 JIT가 잘못 될 수 있다고 의심하지만 다른 가능성이 부족합니다 …

Visual Studio에서 실행할 때 출력 :

    0 0,
    0 1,
    1 0,
    1 1,

Visual Studio 외부에서 릴리스를 실행할 때 출력 :

    0 2,
    0 2,
    1 2,
    1 2,

이유가 무엇입니까?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Test
{
    struct IntVec
    {
        public int x;
        public int y;
    }

    interface IDoSomething
    {
        void Do(IntVec o);
    }

    class DoSomething : IDoSomething
    {
        public void Do(IntVec o)
        {
            Console.WriteLine(o.x.ToString() + " " + o.y.ToString()+",");
        }
    }

    class Program
    {
        static void Test(IDoSomething oDoesSomething)
        {
            IntVec oVec = new IntVec();
            for (oVec.x = 0; oVec.x < 2; oVec.x++)
            {
                for (oVec.y = 0; oVec.y < 2; oVec.y++)
                {
                    oDoesSomething.Do(oVec);
                }
            }
        }

        static void Main(string[] args)
        {
            Test(new DoSomething());
            Console.ReadLine();
        }
    }
}

답변

      for (oVec.x = 0; oVec.x < 2; oVec.x++) {
0000000a  xor         esi,esi                         ; oVec.x = 0
        for (oVec.y = 0; oVec.y < 2; oVec.y++) {
0000000c  mov         edi,2                           ; oVec.y = 2, WRONG!
          oDoesSomething.Do(oVec);
00000011  push        edi
00000012  push        esi
00000013  mov         ecx,ebx
00000015  call        dword ptr ds:[00170210h]        ; first unrolled call
0000001b  push        edi                             ; WRONG! does not increment oVec.y
0000001c  push        esi
0000001d  mov         ecx,ebx
0000001f  call        dword ptr ds:[00170210h]        ; second unrolled call
      for (oVec.x = 0; oVec.x < 2; oVec.x++) {
00000025  inc         esi
00000026  cmp         esi,2
00000029  jl          0000000C 

  for (int x = 0; x < 2; x++) {
    for (int y = 0; y < 2; y++) {
      oDoesSomething.Do(new IntVec(x, y));
    }
  }

// save context
00000000  push        ebp
00000001  mov         ebp,esp
00000003  push        edi
00000004  push        esi
00000005  push        ebx

// put oDoesSomething pointer in ebx
00000006  mov         ebx,ecx

// zero out edi, this will store oVec.y
00000008  xor         edi,edi

// zero out esi, this will store oVec.x
0000000a  xor         esi,esi

// NOTE: the inner loop is unrolled here.
// set oVec.y to 2
0000000c  mov         edi,2

// call oDoesSomething.Do(oVec) -- y is always 2!?!
00000011  push        edi
00000012  push        esi
00000013  mov         ecx,ebx
00000015  call        dword ptr ds:[002F0010h]

// call oDoesSomething.Do(oVec) -- y is always 2?!?!
0000001b  push        edi
0000001c  push        esi
0000001d  mov         ecx,ebx
0000001f  call        dword ptr ds:[002F0010h]

// increment oVec.x
00000025  inc         esi

// loop back to 0000000C if oVec.x < 2
00000026  cmp         esi,2
00000029  jl          0000000C

// restore context and return
0000002b  pop         ebx
0000002c  pop         esi
0000002d  pop         edi
0000002e  pop         ebp
0000002f  ret