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/// near-direct method: rotations with moving mask unsigned rbN4 (unsigned arg) { __asm { mov edx, arg // edx := arg mov esi, 10001H // moving mask, starting with 00010001H rol edx, 1 // first rotation mov eax, esi // copy mask to do & in-place and eax, edx // apply mask mov ecx, 15 // 15 iterations ahead NEXT: // loop begin rol esi, 1 // next mask rol edx, 2 // next rotation mov ebx, esi and ebx, edx or eax, ebx // store next two bits sub ecx, 1 jnz NEXT // while ecx != 0 } // return eax }
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