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CMP Instruction
This instruction basically subtracts one operand from the other for comparing whether the operands are equal or not. It does not disturb the destination or source operands. It is used along with the conditional jump instruction for decision making.Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Arithmetic Logical Instructions > Compare Two Operands (cmp)x86 assembly language is the name for the family of assembly languages which provide some level of backward compatibility with CPUs back to the Intel 8008 microprocessor, which was launched in April 1972. It is used to produce object code for the x86 class of processors.
What is cmp in x86?
CMP Instruction
This instruction basically subtracts one operand from the other for comparing whether the operands are equal or not. It does not disturb the destination or source operands. It is used along with the conditional jump instruction for decision making.
What does cmp mean in assembly?
Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Arithmetic Logical Instructions > Compare Two Operands (cmp)
Assembly Language Programming Tutorial – 39 – CMP Instruction
Images related to the topicAssembly Language Programming Tutorial – 39 – CMP Instruction
What is x86 code?
x86 assembly language is the name for the family of assembly languages which provide some level of backward compatibility with CPUs back to the Intel 8008 microprocessor, which was launched in April 1972. It is used to produce object code for the x86 class of processors.
What is the difference between cmp and sub instruction?
Explanation: The cmp is used for comparing the numeric value with the source value to the destination value in the Microprocessor 8086 Where as sub is used for subtract the source value to the destination numeric value in the Microprocessor 8086.
Is cmp signed or unsigned?
On x86, you use the same “cmp” instruction, but “jl” and “jg” (jump if Less, or Greater) do a signed comparison, while “ja” and “jb” (jump if Above, or Below) do an unsigned comparison.
What does Ret Do x86?
Description. The ret instruction transfers control to the return address located on the stack. This address is usually placed on the stack by a call instruction. Issue the ret instruction within the called procedure to resume execution flow at the instruction following the call .
Which flag does cmp update?
The CMP Instruction: The CMP instruction operates by performing an implied subtraction of the two operands. This means that the result is not stored in memory. After subtracting them, it does a few quick tests, updating the Z,O,C,S, and P flags.
See some more details on the topic x86 cmp here:
CMP — Compare Two Operands
Compare imm32 sign-extended to 64-bits with RAX. 80 /7 ib, CMP r/m8, imm8, MI, Valid, Valid, Compare imm8 with r/m8. REX …
Understanding cmp instruction – assembly – Stack Overflow
cmp arg2, arg1 performs the same operation as sub arg2, arg1 except that none of the operands are modified. The difference is not stored …
X86-assembly/Instructions/cmp – aldeid
The cmp instruction is used to perform comparison. It’s identical to the sub instruction except it does not affect operands.
Assembly – Conditions – Tutorialspoint
The CMP instruction compares two operands. It is generally used in conditional execution. This instruction basically subtracts one operand from the other …
How many bytes does cmp compare?
The file comparison command helps us to compare the files and find the similarities and differences between these files. the cmp command is used to compare two files byte by byte. If a difference is found, it reports the byte and line number where the first difference is found.
What do arm subs do?
SUBS pc, lr, # imm subtracts a value from the link register and loads the PC with the result, then copies the SPSR to the CPSR. You can use SUBS pc, lr, # imm to return from an exception if there is no return state on the stack.
What is TST in assembly?
The TST instruction performs a bitwise AND operation on the value in Rn and the value of Operand2 . This is the same as an ANDS instruction, except that the result is discarded.
What are ARM adds?
Usage. The ADD instruction adds the values in Rn and Operand2 . The SUB instruction subtracts the value of Operand2 from the value in Rn . The RSB (Reverse SuBtract) instruction subtracts the value in Rn from the value of Operand2 .
cmp instruction in x86 | Assembly language | Jump statements code and explanation
Images related to the topiccmp instruction in x86 | Assembly language | Jump statements code and explanation
Is 32-bit and 86 bit the same?
x86 is the name of the architecture that it’s built to run on (the name comes from a series of old Intel processors, the names of which all ended in 86, The first of which was the 8086). Although x86 was originally a 16-bit architecture, the version in use today is the 32-bit extension.
What is x86-64 instruction set?
x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit version of the x86 instruction set, first released in 1999. It introduced two new modes of operation, 64-bit mode and compatibility mode, along with a new 4-level paging mode.
What is sub instruction?
SUB Instruction. The SUB instruction performs a subtraction on the first source register’s contents by the second source. register’s contents, and stores the result in the destination register. It’s syntax is: SUB $destination register’s address, $first source register’s address, $second source register’s address.
What is the difference between sub and CMP in 8085?
CMP is used for comparing 2 registers by subtraction them from one another, but answer is not saved, whereas SUB subtracts 2 registers and saves the answer.
What is the function of CMP B?
CMP B subtracted the contents of register B from the accumulator content A and the result store in A. As given that the contents of A is less than B, so the result is in 2’s complement form so CY = 1, but zero flag is reset, because both A and B content are not equal.
What does Movslq mean in assembly?
MOVSLQ is move and sign-extend a value from a 32-bit source to a 64-bit destination. MOVSLQ is move and sign-extend a value from a 32-bit source to a 64-bit destination.
What is JS Assembly?
The js (or jne) instruction is a conditional jump that follows a test. It jumps to the specified location if the previous instruction sets the Sign Flag (SF).
What is jae in assembly?
jae means Jump if above or equal. It will jump if the carry flag is equal to 0.
What is call and ret?
CALL pushes the return address onto the stack and transfers control to a procedure. RET pops the return address off the stack and returns control to that location.
CMP en ASM x86 (emu8086)
Images related to the topicCMP en ASM x86 (emu8086)
What does RET 4 do?
ret 4 just returns like usual but then adds 4 to the stack pointer ( esp ) so you don’t have to pop word2 pop word1 off the stack after returning from the call, therefore it cleans/balances the stack without needing to pop the previous pushes.
What is RET in microcontroller?
Description: RET is used to return from a subroutine previously called by LCALL or ACALL. Program execution continues at the address that is calculated by popping the topmost 2 bytes off the stack.
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