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|    comp.lang.asm.x86    |    Ahh, the lost art of x86 assembly    |    4,675 messages    |
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|    Message 3,244 of 4,675    |
|    aen@nospicedham.spamtrap.com to Steve    |
|    Re: Backward LCG    |
|    19 Jan 18 15:01:09    |
      On Fri, 19 Jan 2018 12:55:48 GMT, Bogus@Embarq.com (Steve) wrote:       >...       > A link or an explaintion of how to determine what the multiplicative       >inverse is would be nice to see.       >..       The code below is the main subroutine of that program. The Algorithm       is from TAOCP.              input: EAX = number       output: EBX = multiplicative inverse              minv:        mov ebx,eax        xor eax,eax        mov edx,1        mov esi,eax       E1:mov edi,1        xor ebp,ebp        jmp _2       E2:xor edx,edx       _2:div ebx        mov ecx,eax       E3:test edx,edx        jnz E4        mov eax,ebx        mov ebx,edi        test ebx,ebx        jns .1        add ebx,esi       .1:ret        E4:mov eax,ebx        mov ebx,edx        mov [temp],ebp        mov ebp,edi        mov edx,ecx        imul edx,edi        mov edi,[temp]        sub edi,edx        jmp E2       --       aen              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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