int, short, byte 자료형의 복사, 비교 구문의 속도를 비교 분석

개요..

 

int, short, byte 자료형의 복사, 비교 구문의 속도를 비교 분석해봅니다.

 

 

 

비교 분석

 

1. 아래코드 [A]를 복사하여 코드를 삽입하고

2. F9로 디버깅 브레이크를 설정하고

3. F5를 눌러 실행한 이후

4. Alt-8 을 눌러보면

5. [B] 와 같은 어셈블리 코드가 나옵니다.

 

[A]

 

int t = 0;     int a = 1;     short b = 2;     BYTE c = 3;       int a0 = 1;     short b0 = 2;     BYTE c0 = 3;       int a1 = a+a0;     int a2 = a+b0;     int a3 = a+c0;       short b1 = b+a0;     short b2 = b+b0;     short b3 = b+c0;       short c1 = c+a0;     short c2 = c+b0;     short c3 = c+c0;       if( a < a0 )         t = 0;     if( a < b0 )         t = 0;     if( a < c0 )         t = 0 ;       if( b < a0 )         t = 0;     if( b < b0 )         t = 0;     if( b < c0 )         t = 0 ;       if( c < a0 )         t = 0;     if( c < b0 )         t = 0;     if( c < c0 )         t = 0 ;

 

 

[B]

 

79: int t = 0;     0042CE73 mov dword ptr [ebp-14h],0         80: int a = 1;     0042CE7A mov dword ptr [ebp-18h],1         81: short b = 2;     0042CE81 mov word ptr [ebp-1Ch],offset CMainWnd::CMainWnd+365h (0042ce85)         82: BYTE c = 3;     0042CE87 mov byte ptr [ebp-20h],3         83:     84: int a0 = 1;     0042CE8B mov dword ptr [ebp-24h],1         85: short b0 = 2;     0042CE92 mov word ptr [ebp-28h],offset CMainWnd::CMainWnd+376h (0042ce96)         86: BYTE c0 = 3;     0042CE98 mov byte ptr [ebp-2Ch],3         87:     88: int a1 = a+a0;     0042CE9C mov edx,dword ptr [ebp-18h]     0042CE9F add edx,dword ptr [ebp-24h]     0042CEA2 mov dword ptr [ebp-30h],edx         89: int a2 = a+b0;     0042CEA5 movsx eax,word ptr [ebp-28h]     0042CEA9 mov ecx,dword ptr [ebp-18h]     0042CEAC add ecx,eax         0042CEAE mov dword ptr [ebp-34h],ecx         90: int a3 = a+c0;     0042CEB1 mov edx,dword ptr [ebp-2Ch]     0042CEB4 and edx,0FFh         0042CEBA mov eax,dword ptr [ebp-18h]     0042CEBD add eax,edx         0042CEBF mov dword ptr [ebp-38h],eax         91:     92: short b1 = b+a0;     0042CEC2 movsx ecx,word ptr [ebp-1Ch]     0042CEC6 add ecx,dword ptr [ebp-24h]     0042CEC9 mov word ptr [ebp-3Ch],cx         93: short b2 = b+b0;     0042CECD movsx edx,word ptr [ebp-1Ch]     0042CED1 movsx eax,word ptr [ebp-28h]     0042CED5 add edx,eax         0042CED7 mov word ptr [ebp-40h],dx         94: short b3 = b+c0;     0042CEDB movsx ecx,word ptr [ebp-1Ch]     0042CEDF mov edx,dword ptr [ebp-2Ch]     0042CEE2 and edx,0FFh         0042CEE8 add ecx,edx         0042CEEA mov word ptr [ebp-44h],cx         95:     96: short c1 = c+a0;     0042CEEE mov eax,dword ptr [ebp-20h]     0042CEF1 and eax,0FFh         0042CEF6 add eax,dword ptr [ebp-24h]     0042CEF9 mov word ptr [ebp-48h],ax         97: short c2 = c+b0;     0042CEFD mov ecx,dword ptr [ebp-20h]     0042CF00 and ecx,0FFh         0042CF06 movsx edx,word ptr [ebp-28h]     0042CF0A add ecx,edx         0042CF0C mov word ptr [ebp-4Ch],cx         98: short c3 = c+c0;     0042CF10 mov eax,dword ptr [ebp-20h]     0042CF13 and eax,0FFh         0042CF18 mov ecx,dword ptr [ebp-2Ch]     0042CF1B and ecx,0FFh         0042CF21 add eax,ecx         0042CF23 mov word ptr [ebp-50h],ax         99:     100: if( a < a0 )         0042CF27 mov edx,dword ptr [ebp-18h]     0042CF2A cmp edx,dword ptr [ebp-24h]     0042CF2D jge CMainWnd::CMainWnd+416h (0042cf36)         101: t = 0;     0042CF2F mov dword ptr [ebp-14h],0         102: if( a < b0 )         0042CF36 movsx eax,word ptr [ebp-28h]     0042CF3A cmp dword ptr [ebp-18h],eax         0042CF3D jge CMainWnd::CMainWnd+426h (0042cf46)         103: t = 0;     0042CF3F mov dword ptr [ebp-14h],0         104: if( a < c0 )         0042CF46 mov ecx,dword ptr [ebp-2Ch]     0042CF49 and ecx,0FFh         0042CF4F cmp dword ptr [ebp-18h],ecx         0042CF52 jge CMainWnd::CMainWnd+43Bh (0042cf5b)         105: t = 0 ;     0042CF54 mov dword ptr [ebp-14h],0         106:     107: if( b < a0 )         0042CF5B movsx edx,word ptr [ebp-1Ch]     0042CF5F cmp edx,dword ptr [ebp-24h]     0042CF62 jge CMainWnd::CMainWnd+44Bh (0042cf6b)         108: t = 0;     0042CF64 mov dword ptr [ebp-14h],0         109: if( b < b0 )         0042CF6B movsx eax,word ptr [ebp-1Ch]     0042CF6F movsx ecx,word ptr [ebp-28h]     0042CF73 cmp eax,ecx         0042CF75 jge CMainWnd::CMainWnd+45Eh (0042cf7e)         110: t = 0;     0042CF77 mov dword ptr [ebp-14h],0         111: if( b < c0 )         0042CF7E movsx edx,word ptr [ebp-1Ch]     0042CF82 mov eax,dword ptr [ebp-2Ch]     0042CF85 and eax,0FFh         0042CF8A cmp edx,eax         0042CF8C jge CMainWnd::CMainWnd+475h (0042cf95)         112: t = 0 ;     0042CF8E mov dword ptr [ebp-14h],0         113:     114: if( c < a0 )         0042CF95 mov ecx,dword ptr [ebp-20h]     0042CF98 and ecx,0FFh         0042CF9E cmp ecx,dword ptr [ebp-24h]     0042CFA1 jge CMainWnd::CMainWnd+48Ah (0042cfaa)         115: t = 0;     0042CFA3 mov dword ptr [ebp-14h],0         116: if( c < b0 )         0042CFAA mov edx,dword ptr [ebp-20h]     0042CFAD and edx,0FFh         0042CFB3 movsx eax,word ptr [ebp-28h]     0042CFB7 cmp edx,eax         0042CFB9 jge CMainWnd::CMainWnd+4A2h (0042cfc2)         117: t = 0;     0042CFBB mov dword ptr [ebp-14h],0         118: if( c < c0 )         0042CFC2 mov ecx,dword ptr [ebp-20h]     0042CFC5 and ecx,0FFh         0042CFCB mov edx,dword ptr [ebp-2Ch]     0042CFCE and edx,0FFh         0042CFD4 cmp ecx,edx         0042CFD6 jge CMainWnd::CMainWnd+4BFh (0042cfdf)         119: t = 0 ;     0042CFD8 mov dword ptr [ebp-14h],0

 

 

결론

 

어셈블리 코드와 다수의 반복을 해보면 int -> int 가 가장 빠르고 다른 방법의 복사가 느림을 알 수 있습니다.

 

따라서 메모리를 절약 또는 편의성을 위해서 byte , short 형을 사용하는 것은 오히려 프로그램을 느리게 함을 알 수 있음을 기억하도록 합시다.

 

하지만 용량을 중요하게 여기는 서버의 경우, 네트워크 전송이나 용량을 고려하여 절충하여 사용해야 합니다.