Repe cmpsb instruction in 8086 architecture

 

 

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Regarding CMPSB instruction. Suppose there are two strings A (SI) and B (DI) with contents as "hello$" and "helloo$" and content of CX is 0005H. REPE CMPSB will show that A and B are not equal. How does this work? Since the CX value is 5 and the instruction is repeated 5 times. They increment (cld instruction) or decrement (std instruction) the pointer in rdi at each step. These string instructions read from register al, the low 8 REP MOVSB Move ECX bytes from [RSI] to [RDI] REPE CMPSB Find nonmatching bytes in [RDI] and [RSI] (keep repeating while [rdi]==[rsi]) REPNE This lecture describes a subset of the 80x86 architecture and instruction set. While it's not possible to cover all the details of the 80x86 you should learn enough about the 8086 instruction set to be able to write simple routines to service interrupts and read/write data to/from I/O ports. 8086 instruction set architecture. MIPS memory. ? We'll make many comparisons between the MIPS and 8086 architectures, focusing on registers, instruction operands, memory and addressing modes, branches, function calls and instruction formats. 8086 instructions complete 8086 instruction set quick reference: aaa aad aam aas adc add and call cbw clc cld cli cmc cmp cmpsb cmpsw cwd daa das dec div hlt idiv imul in inc int into iret ja jae jb jbe jc jcxz je jg jge jl jle jmp jna jnae jnb jnbe jnc jne jng jnge jnl jnle jno jnp jns jnz. 8086 Instruction Sets. Microprocessor - 8086 Interrupts. 8086 Addressing Modes. Microcontrollers - 8051 Architecture. 8051 Pin Description. 8051 Input Output Ports. REPE/REPZ ? Used to repeat the given instruction until CX = 0 or zero flag ZF = 1. Z r REPE chain instruction Repeat following CMPSB, CMPSW, SCASB, SCASW Z r REPNZ chain instruction Repeat following CMPSB, CMPSW, SCASB, SCASW instructions while ZF Different types of instruction set architecture? RISC - Reduced Instruction Set Computer CISC - Comples rep stosl. F3 A6. repe cmpsb. REP, REPE (repeat while equal), and REPNE (repeat while not equal) are prefix that are applied to string operation. Virtual 8086 Mode Exceptions. #UD if a repeat prefix is used before an instruction that is not in the list above; further exceptions can be generated when the Another advantage of 8086 instruction set is that it is much smaller, and thus easier to learn. Cmpsb cmpsw cwd daa das dec DIV hlt IDIV imul in inc int into iret ja. Rcr rep repe repne repnz repz ret retf rol ROR sahf sal sar sbb. Instructions in alphabetical order: Instruction Operands. MOV - MOV Destination, Source The MOV instruction copies a word or byte of data from a specified source to a specified destination. When the 8086 executes a near CALL instruction, it decrements the stack pointer by 2 and copies the offset of the next instruction after the CALL into the stack. String Instructions. Cmps/cmpsb/cmpsw. The CMPSB(W) instruction can be used to compare a byte(word) in one string (DS:offset in SI) with a byte (word) in another string (ES:offset in DI). MOV CX, 100. CLD; Clear the direction flag. REPE CMPSB.

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