Assembly division program

Click here to Download the pdf version of the file. If you are studying Microprocessor Programming, then you probably will need more Programs.

Check out the program to Multiply two no. Browse the site for more. Hope you like them. If you find a mistake or have any requests feel free to comment. Check out the following video to earn how to enter hex codes andexecute a program in uP kit. Your email address will not be published. The DIV instruction performs the division of two unsigned operands. The denominator resides in a source operand and it should not be immediate.

However, it can be register or a memory location. There are four division cases depending on the number of bits. The division can be:. In this case, the nominator and denominator operands are bytes.

The nominator resides in the AL register and AH is set to zero. After division, the instruction stores quotient in AL and the remainder in AH register. F2 divided by 04 gives quotient of 3C and give 02 as a remainder. AL stores the quotient and remainder is stored in AH register. In this case, the AX register holds the numerator. After division, the quotient is stored in the AX register and the remainder goes to the DX register. The output window shows that the division of FH by 41A8 gives the remainder of 2D1B and 03 as a quotient.

The numerator is a bit word stored in AX which is divided with an 8-bit denominator. After division, the AL contains the quotient and AH will contain the remainder. It is the last case of division in which a numerator is a bit number and a denominator is a bit number. In this case, AX and DX stores the numerator. What then about the 2nd approach? Those would be true bit operands, aren't they?

Yes, 2nd approach makes the function fully 64 bit integer valid, which makes the performance price acceptable. Even your first part of answer may be interesting and help some people to realize what to do in situations when they must promote 32 bit integer to 64b, but just in this particular case of that int div int a, int b it's a bit..

You forgot to mention that clobbering rbx isn't safe, and that it's useless. Use idiv esi like a normal person in your final example.

And use movsx rcx, esi , or movsx rsi, esi in your first example. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

Post as a guest Name. Email Required, but never shown. Learn more about Collectives on Stack Overflow. The Overflow Blog. Podcast Making Agile work for data science.

Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked Related 1. Hot Network Questions. Question feed.