What is JZ in assembly language?

by Geneva Payne | views: 798

jz is "jump if zero". cmp subtracts its two operands, and sets flags accordingly. (See here for reference.) If the two operands are equal, the subtraction will result in zero and the ZF flag will be set.

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Not forgetting, what is jz and jnz?

JE and JZ are just different names for exactly the same thing: a conditional jump when ZF (the "zero" flag) is equal to 1. (Similarly, JNE and JNZ are just different names for a conditional jump when ZF is equal to 0.)

On top of that, what does jl mean in assembly language?

InstructionUseful to...
jlSigned <
jleSigned <=
joSigned overflow

That may lead you to ask, what is jb in assembly language? Home » Instructions » JB. The JB instruction branches to the address specified in the second operand if the value of the bit specified in the first operand is 1. The bit that is tested is not modified.

What does Jnz mean in assembly language?

JNZ is short for "Jump if not zero (ZF = 0)", and NOT "Jump if the ZF is set". If it's any easier to remember, consider that JNZ and JNE (jump if not equal) are equivalent.

33 Related Questions & Answers

What is JZ x86?

The jz instruction is a conditional jump that follows a test. It jumps to the specified location if the Zero Flag (ZF) is set (1). jz is commonly used to explicitly test for something being equal to zero whereas je is commonly found after a cmp instruction.

What does JNE mean in assembly?

InstructionDescriptionFlags tested
JNE/JNZJump not Equal or Jump Not ZeroZF
JA/JNBEJump Above or Jump Not Below/EqualCF, ZF
JAE/JNBJump Above/Equal or Jump Not BelowCF
JB/JNAEJump Below or Jump Not Above/EqualCF

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 SHR in assembly?

The SHR (shift right) instruction performs a logical right shift on the destination operand. The highest bit position is filled with a zero.

What does Imul do in assembly?

The single-operand form of imul executes a signed multiply of a byte, word, or long by the contents of the AL, AX, or EAX register and stores the product in the AX, DX:AX or EDX:EAX register respectively.

What is the difference between the JB and JL instructions?

jb is for unsigned comparison as it uses the carry flag. jl is for signed comparison which handles overflow as well. In the given code js just checks whether the MSB of eax is set or not (meaning it's negative if viewed as signed). The jb is just doing an unsigned less-than.

What is SJMP in 8051?

The SJMP instruction transfers execution to the specified address. The address is calculated by adding the signed relative offset in the second byte of the instruction to the address of the following instruction.

What is JBC in microprocessor?

The JBC instruction branches to the address specified in the second operand if the value of the bit specified in the first operand is 1. Otherwise, execution continues with the next instruction. If the bit specified in the first operand is set, it is cleared. No flags are affected by this instruction. Note.

What is NOP in assembly?

What Does No Operation (NOP) Mean? A no operation or “no-op” instruction in an assembly language is an instruction that does not implement any operation. IT pros or others might refer to this as a blank instruction or placeholder.

What is Lea command in assembly?

lea — Load effective address. The lea instruction places the address specified by its first operand into the register specified by its second operand. Note, the contents of the memory location are not loaded, only the effective address is computed and placed into the register.

What is Sta microprocessor?

In 8085 Instruction set, STA is a mnemonic that stands for STore Accumulator contents in memory. In this instruction,Accumulator8-bit content will be stored to a memory location whose 16-bit address is indicated in the instruction as a16. This instruction uses absolute addressing for specifying the destination.

What is JB x86?

IIRC, on x86 "JB" means "Jump if Borrow," which would occur if the carry flag is set as pointed out by Simon... – stix.

What does x86 call do?

The call instruction is used to call a function. The CALL instruction performs two operations: It pushes the return address (address immediately after the CALL instruction) on the stack. It changes EIP to the call destination.

What is JE instruction?

A conditional jump instruction, like "je" (jump-if-equal), does a goto somewhere if the two values satisfy the right condition. For example, if the values are equal, subtracting them results in zero, so "je" is the same as "jz".

What does Jge mean in assembly?

jge means "Jump if greater or equal (SF=OF)", it's synonymous with jnl . See Intel x86 JUMP quick reference.

What is RDI register?

Architectures define a calling convention which dictates where parameters to a function and its return value are stored. In Objective-C, the RDI register is the reference of the calling NSObject , RSI is the Selector, RDX is the first parameter and so on.