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   comp.lang.asm.x86      Ahh, the lost art of x86 assembly      4,675 messages   

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   Message 3,132 of 4,675   
   Richmond to Richmond   
   Re: DIV confusion   
   29 Nov 17 20:36:40   
   
   From: p1299721@nospicedham.protonmail.com   
      
   Richmond  writes:   
      
   > Looking at the Intel 64 and IA-32 Architectures Software Developer’s   
   > Manual Volume 2 (2A, 2B, 2C & 2D): I see the definition of DIV says:   
   >   
   > Unsigned divide EDX:EAX by r/m32, with result stored in EAX (Quotient),   
   > EDX (Remainder).   
   >   
   > So EAX:=EDX:EAX/n remainder EDX.   
   >   
   > But it also says the maximum quotent is 2^32-1, so why does it need two   
   > 32 bit registers for the quotent? (AL=8,AX=16,EAX=32,RAX=64).   
      
   OK I see my mistake. The quotent is the result, not the dividend.   
      
      
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