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30 Nov 2016 If you understood my explanation above, after a mul instruction, you should see the contents of the ax and dx registers change. You will also see flags and the instruction pointer change, if your debugger shows either of them. Nothing else should change! (Intel's instruction reference manual doesn't list any
This instruction has three forms, depending on the number of operands. - One-operand form. This form is identical to that used by the MUL instruction. Here, the source operand (in a general-purpose register or memory location) is multiplied by the value in the AL, AX, or EAX register (depending on the operand size) and the
Assembly Arithmetic Instructions - Learning assembly programming language in simple and easy steps using this beginner's tutorial containing basic to advanced knowledge starting from Environment Setup, Status Register, Arithmetic Instructions, Conditional Execution, Loop Instructions, Logical Instructions, String
Arithmetic instructions take two operands: a destination and a source. The destination must be a register or a add src, dest, GAS Syntax. add dest, src, Intel syntax As MUL, only signed. The IMUL instruction has the same format as MUL, but also accepts two other formats like so:
Opcode, Instruction, Op/En, 64-Bit Mode, Compat/Leg Mode, Description. F6 /4, MUL r/m8, M, Valid, Valid, Unsigned multiply (AX < AL ? r/m8). REX + F6 /4, MUL r/m8*, M, Valid, N.E., Unsigned multiply (AX < AL ? r/m8). F7 /4, MUL r/m16, M, Valid, Valid, Unsigned multiply (DX:AX < AX ? r/m16). F7 /4, MUL r/m32, M
Opcode, Mnemonic, Description. F6 /4, MUL r/m8, Unsigned multiply (AX = AL * r/m8). F7 /4, MUL r/m16, Unsigned multiply (DX:AX = AX * r/m16). F7 /4, MUL r/m32, Unsigned multiply (EDX:EAX = EAX * r/m32).
Irvine, Kip R. Assembly Language for Intel-Based Computers, 2003. 1. Multiplication and Division Instructions. • MUL Instruction. • IMUL Instruction. • DIV Instruction. • Signed Integer Division. • Implementing Arithmetic Expressions
Documentation Home > x86 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Multiply and Divide Instructions > Unsigned Multiplication of AL, AX or EAX(mul). x86 Assembly Language Reference Manual. Previous: Signed Multiply (imul) · Next: Unsigned Divide (div)
The x86 instruction set refers to the set of instructions that x86-compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes
11 Nov 2015 Description. The mul instruction is used to perform a multiplication. Always multiplies EAX by a value. The result of the multiplication is stored in a 64-bits value accross EDX (most significant 32 bits of the operation) and EAX (least significant 32 bits of the operation).
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