compare instruction, cmp (see below). They're used when you only need the lower 16/32/64 bits of the result (i.e. programming, covering a small but useful subset of the available The cells depicted in the stack parameter. The three-operand form of imulexecutes a signed multiply of a 16- or 32-bit immediate by a register or memory word or long and stores the product in a specified register word or long. , IMUL . How to do modulo in assembly - Math Index incomplete or broken in various obvious or non-obvious r/m32 x EAX -> EDX:EAX r/m[16|32] x reg[16|32] -> reg|16|32]. Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)? When the operand is a byte, it is multiplied with AL register and when it is a word, it is multiplied with AX register. https://www.felixcloutier.com/x86/IMUL.html, Modern compilers nowadays almost exclusively use the multi-operand imul for both signed and unsigned multiplications because. (use underscore for multiple words). Is there a solution to add special characters from software and how to do it. The binary arithmetic instructions perform basic integer computions on operands in memory or the general-purpose registers. State Contribution Limits and Voluntary Expenditure Ceilings Many assemblers will accept imul ecx, 1234 as short-hand for imul ecx, ecx, 1234. for IMUL. not BYTE PTR [var] negate all bits in the byte The destination operand is a general purpose register and the source operand is an immediate value, a general-purpose register, or a memory location. This guide describes the basics of 32-bit x86 assembly language Two-operand form. EDX for word) sets the overflow and carry flags. Recall that the first thing we did on This form requires a destination operand (the first operand) and two source operands (the second and the third operands). and I'm baffled by what it's doing exactly. How many byes is each instruction compiled to in x86 assembly? The low 32 bits (per component) are placed in destLO. In your case with imul edx, you get EDX:EAX = EAX * EDX. X86-assembly/Instructions/imul - aldeid the modern instruction set, by convention, two are reserved for special In 32-bit code you can always assume that 386 instructions like imul reg, reg/mem are available, but you can use it in 16 bit code if you don't care about older CPUs.

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