You are correct but if we have OR which is an R-Type, then the opcode is indeed 000000 however the ALU Opcode, when using a 2 bit signal, is 01. Additionally, in our sheet it says that the last 6 bits for R-Type is called the function and not ALUop.
OPCODE: It is a number interpreted by your machine (virtual or silicon) that represents the operation to perform BYTECODE: Same as machine code, except, its mostly used by a software based interpreter (like Java or CLR) MNEMONIC: English word MNEMONIC means "A device such as a pattern of letters, ideas, or associations that assists in remembering something.". So, its usually used by assembly ...
Recently in an exam, when asked about opcode vs operand, I gave an example mov [ax],0000h where I said the mov was the opcode and [ax],0000h was the operand and together they formed an instruction...
What is a relatively quick and easy method of looking up what an arbitrary opcode means (say, 0xC8) in x86? The Intel Software Developer's manual isn't very fun to search through...
3.1.1.1 Opcode Column in the Instruction Summary Table (Instructions without VEX Prefix) The “Opcode” column in the table above shows the object code produced for each form of the instruction. When possible, codes are given as hexadecimal bytes in the same order in which they appear in memory. Definitions of entries other than hexadecimal bytes are as follows: REX.W — Indicates the ...
Qual a diferença entre eles? Sei que tanto opcode como conjunto de instruções mostram comandos que existem em cada arquitetura.
How to interpret the opcode manually? covers decoding ModRM. what does opcode FF350E204000 do? is another duplicate of this, using FF /6 push r/m64 as the example. x86 OpCode Instruction Decoding is yet another duplicate. I found all these googling on site:stackoverflow.com x86-64 register/opcode field