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MP Compares the first source operand with the second source operand and sets the status flags in the EFLAGS register according to the results. The comparison is performed by subtracting the second operand from the first operand and then setting the status flags in the same manner as the SUB instruction. When an immediate value is used as an operand, it is sign-extended to the length of the first operand.
So, only the flags are affected.
Operation:
temp = Source1 - SignExtend(Source2);
ModifyStatusFlags(); //Modify status flags in the same manner as the SUB instruction
Flags affected:
The CF, OF, SF, ZF, AF, and PF flags are set according to the result.
What else can I help you with?
What is instruction format of cmp?
The instruction format of the CMP (compare) instruction varies by architecture, but generally, it follows a similar structure across different assembly languages. Typically, it includes an opcode followed by two operands, which can be registers, immediate values, or memory locations. The CMP instruction compares the values of the operands and sets the processor flags (such as Zero Flag, Sign Flag, and Carry Flag) based on the result, without modifying the actual values. This allows subsequent conditional instructions to determine the flow of control based on the comparison.
What is the difference between instruction registers and instruction pointer?
instruction register is used to store the next instruction to be executed. instruction pointer is used to store the address of the next instruction to be executed.
What causes a po342 code?
i have checked the voltage to the cmp, and i have changed the cmp! the code will not clear, and i have a hard start. just installed new engine!
What is mov instruction in 8086?
The MOV instruction in the 8086 microprocessor is used to transfer data from one location to another. It can move data between registers, from memory to registers, or from registers to memory. The syntax typically follows the format MOV destination, source, where the destination receives the data from the source. This instruction does not affect the flags in the status register.
Instruction Buffer Register?
An Instruction Buffer Register is also known as IBR. It registers a computer's processor or its Central Processing Unit (CPU).
User visible register?
Registers that are used during prigramming and specified directly by the instruction.
Which register or registers are used as an offset address for the string instruction destination in the microprocessor?
EAX
What is CMP in 8085 microprocessor?
In the 8085 microprocessor, CMP (Compare) is an instruction used to compare the contents of the accumulator (register A) with another specified register or memory location. It effectively subtracts the value of the specified operand from the accumulator but does not store the result; instead, it sets the status flags (zero, carry, and sign) based on the outcome of the comparison. This allows for conditional branching in programs, as the results can be used to determine the flow of execution. The CMP instruction helps in decision-making processes within the microprocessor's operation.
How program instructions transfer in and out of memory?
The instructions have to remain in memory at all times while the program is running. They get there by loading the entire program into memory. The CPU's instruction registers keep track of the current instruction and the next instruction.
What register points to the next instruction?
actually register holds the data..there are 6 register which are temporary registers..program counter holds the address of next instruction to be fetched..instruction register holds the currently executed data...
What is function of nop in microprocessor?
The NOP instruction is short for no-operation. It is an executable instruction that does nothing to the processor, its registers, or its flags. It is useful in timing loops, or to provide room for patchabilty of a piece of code.
How are the 32-bit registers selected for the Pentium 4 microprocessor?
In the Pentium 4 microprocessor, the 32-bit registers are selected based on the architecture's design, which includes a set of general-purpose registers, segment registers, and special-purpose registers. The general-purpose registers (EAX, EBX, ECX, EDX, ESI, EDI, EBP, ESP) can be utilized for various operations, while the segment registers (CS, DS, SS, ES, FS, GS) manage memory segmentation. The selection of registers is also influenced by the instruction set architecture (ISA) and the specific needs of the executing program, allowing for efficient data handling and processing. Additionally, register renaming techniques may be employed to optimize instruction execution and reduce hazards.
