rev2023.3.3.43278. For example, let's take a value in register EAX, modulo 64. How does the GCC implementation of modulo (%) work, and why does it not use the div instruction? CMP is often used for comparing whether a counter value has reached the number of times a loop needs to be run. 128 / 256 = 0.5. These instructions have syntaxes like . when operand is a word: AX = (AX) / operand, DX = remainder (modulus). Assembly - Arithmetic Instructions - tutorialspoint.com The variables are double-digit variables. Since assembly language is not as easy to read as higher-level languages, good programmers will place a comment on almost every line. 0x11:23 / 0x12 is less than 0xff so it fits in an 8-bit quotient. Multiplication and Division in MIPS Assembly Language How to use the div instruction to find remainder in x86 assembly? Carnauba wax, a wax that coats the leaves of the Brazilian palm tree, is used for hard, high-gloss finishes for floors, boats, and automobiles. Using Kolmogorov complexity to measure difficulty of problems? In your example, that would give. XORing an operand with itself changes the operand to 0. When a file is opened, the file pointer is set to zero. @bluebk you can't do a 8 bit division of 9b8 by 7. the result is greater than 0xff. For example, we can define a word variable 'months' in either of the following way . x86 Assembly Language - Integer Multiplication, Division, and - YouTube NOT operation reverses the bits in an operand. 14 CBW, CWD, CDQ Instructions The CBW, CWD, and CDQ instructions provide important sign-extension operations: CBW (convert byte to word) extends AL into AH CWD (convert word to doubleword) extends AX into DX CDQ (convert doubleword to quadword) extends EAX into EDX You need to take the following steps for using Linux system calls in your program .