TAlpha::Negative 部分汇编

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      Width *= 3;      register const int ld = iLineAdd + Width;      Width >>= 1;      Width--;      for (register int i = Height - 1; i >= 0; i--)       {        register unsigned short int *ptr = (unsigned short int *)ptrBuffer;        for (register int j = Width; j >= 0; j--)         {          *ptr = ~*ptr;          ptr++;         }        ptrBuffer += ld;       }

汇编代码

:00425E95 8D1C52         lea ebx, dword ptr [edx+2*edx] ; edx = Width:00425E98 89DA           mov edx, ebx;:00425E9A 81EA23010000  sub edx, 00000123:00425EA0 8B5D0C         mov ebx, dword ptr [ebp+0C]:00425EA3 03DA           add ebx, edx:00425EA5 D1FA           sar edx, 1:00425EA7 895DFC         mov dword ptr [ebp-04], ebx ; [ebp-04] = ld:00425EAA 4A             dec edx:00425EAB 49             dec ecx:00425EAC 894DF8         mov dword ptr [ebp-08], ecx ; [ebp-08] = i:00425EAF 837DF800       cmp dword ptr [ebp-08], 00000000:00425EB3 7C50           jl 00425F05:00425EB5 8BC8           mov ecx, eax ; eax = ptrBuffer:00425EB7 8BDA           mov ebx, edx ; ebx = j:00425EB9 85DB           test ebx, ebx:00425EBB 7C0B           jl 00425EC8:00425EBD 66F711         not word ptr [ecx] ; *ptr = ~*ptr:00425EC0 83C102         add ecx, 00000002  ; ptr++ :00425EC3 4B             dec ebx            ; j-- :00425EC4 85DB           test ebx, ebx:00425EC6 7DF5           jge 00425EBD:00425EC8 0345FC         add eax, dword ptr [ebp-04]:00425ECB FF4DF8         dec [ebp-08]:00425ECE 837DF800       cmp dword ptr [ebp-08], 00000000:00425ED2 7DE1           jge 00425EB5

 Width--; #ifdef _using_color_rgb_struct_    register color_rgb *pDest;    register const int ld = iPixelAdd + 3;    for (register int i = Height - 1; i >= 0; i--)     {      for (register int j = Width; j >= 0; j--)       {        pDest = (color_rgb *)ptrDest;        *((unsigned short int *)ptrDest) = ~*((unsigned short int *)ptrDest);        pDest->r = ~pDest->r;        ptrDest += ld;       }      ptrDest += iLineAdd;     } #else

汇编代码

:00425ED6 4A        dec edx ; Width--:00425ED7 8D7B03    lea edi, dword ptr [ebx+03] ; edi = ld:00425EDA 49        dec ecx:00425EDB 894DF4    mov dword ptr [ebp-0C], ecx ; [ebp-0C] = i:00425EDE 837DF400  cmp dword ptr [ebp-0C], 00000000:00425EE2 7C21      jl 00425F05:00425EE4 8BF2      mov esi, edx ; j = Width:00425EE6 85F6      test esi, esi ; esi = j:00425EE8 7C0F      jl 00425EF9:00425EEA 8BC8      mov ecx, eax ; ecx = pDest 多浪费一步:00425EEC 66F710    not word ptr [eax]:00425EEF F65102    not [ecx+02]:00425EF2 03C7      add eax, edi ; ptrDest += ld:00425EF4 4E        dec esi:00425EF5 85F6      test esi, esi:00425EF7 7DF1      jge 00425EEA:00425EF9 03450C    add eax, dword ptr [ebp+0C] ; ptrDest += iLineAdd:00425EFC FF4DF4    dec [ebp-0C] ; i--:00425EFF 837DF400  cmp dword ptr [ebp-0C], 00000000:00425F03 7DDF      jge 00425EE4

 Width--; #ifdef _using_short_int_    register const int ld = iPixelAdd + 2;    for (register int i = Height - 1; i >= 0; i--)     {      for (register int j = Width; j >= 0; j--)       {        *ptrDest = ~*ptrDest;        ptrDest++;        *((unsigned short int *)ptrDest) = ~*((unsigned short int *)ptrDest);        ptrDest += ld;       }      ptrDest += iLineAdd;     }

汇编代码

:00425EC8 4A            dec edx ; Width--:00425EC9 8D7302        lea esi, dword ptr [ebx+02] ; ld = iPixelAdd + 2:00425ECC 81C223010000  add edx, 00000123:00425ED2 8D79FF        lea edi, dword ptr [ecx-01] ; i = Height - 1:00425ED5 85FF          test edi, edi:00425ED7 7C1B          jl 00425EF4:00425ED9 8BCA          mov ecx, edx:00425EDB 85C9          test ecx, ecx:00425EDD 7C0D          jl 00425EEC:00425EDF F610          not byte ptr [eax] ; *ptrDest = ~*ptrDest:00425EE1 40            inc eax ; ptrDest++:00425EE2 66F710        not word ptr [eax] ; *((unsigned short int *)ptrDest) = ~*((unsigned short int *)ptrDest):00425EE5 03C6          add eax, esi ; ptrDest += ld:00425EE7 49            dec ecx      ; j--:00425EE8 85C9          test ecx, ecx:00425EEA 7DF3          jge 00425EDF:00425EEC 03450C        add eax, dword ptr [ebp+0C] ; ptrDest += iLineAdd:00425EEF 4F            dec edi ; i--:00425EF0 85FF          test edi, edi:00425EF2 7DE5          jge 00425ED9

内循环do...while

 Width--; #ifdef _using_short_int_    register const int ld = iPixelAdd + 2;    for (register int i = Height - 1; i >= 0; i--)     {      register int j = Width;      do       {        *ptrDest = ~*ptrDest;        ptrDest++;        *((unsigned short int *)ptrDest) = ~*((unsigned short int *)ptrDest);        ptrDest += ld;        j--;       }while(j >= 0);      ptrDest += iLineAdd;     }

汇编代码

:00425E98 4A            dec edx  ; Width--:00425E99 8D7B02        lea edi, dword ptr [ebx+02]:00425E9C 81C223010000  add edx, 00000123:00425EA2 8D71FF        lea esi, dword ptr [ecx-01]:00425EA5 85F6          test esi, esi  ; esi = i:00425EA7 7C17          jl 00425EC0:00425EA9 8BCA          mov ecx, edx   ; j = Width:00425EAB F610          not byte ptr [eax]  ; *ptrDest = ~*ptrDest:00425EAD 40            inc eax             ; ptrDest++:00425EAE 66F710        not word ptr [eax]  :00425EB1 03C7          add eax, edi        ; ptrDest += ld:00425EB3 49            dec ecx             ; j--:00425EB4 85C9          test ecx, ecx:00425EB6 7DF3          jge 00425EAB:00425EB8 03450C        add eax, dword ptr [ebp+0C]  ; ptrDest += iLineAdd:00425EBB 4E            dec esi        ;  i--  :00425EBC 85F6          test esi, esi:00425EBE 7DE9          jge 00425EA9