What is JNE instruction?

What is JNE instruction?

The jnz (or jne) instruction is a conditional jump that follows a test. It jumps to the specified location if the Zero Flag (ZF) is cleared (0). jnz is commonly used to explicitly test for something not being equal to zero whereas jne is commonly found after a cmp instruction.

What is the equivalent opcode of the jump instruction JBE?

Intel x86 JUMP quick reference

Instruction Description short jump opcodes
JNB JAE JNC Jump if not below Jump if above or equal Jump if not carry 73
JBE JNA Jump if below or equal Jump if not above 76
JA JNBE Jump if above Jump if not below or equal 77
JL JNGE Jump if less Jump if not greater or equal 7C

What is the difference between JZ and JNZ?

3 Answers. 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.)

What is JB x86?

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

What does Jnz stand for?

Jump if not zero
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.

What is Jnz in 8051?

The JNZ instruction transfers control to the specified address if the value in the accumulator is not 0. If the accumulator has a value of 0, the next instruction is executed. Neither the accumulator nor any flags are modified by this instruction.

Are the Ja and JNBE instructions equivalent?

1 Answer. Assuming you mean the ja and jnbe mnemonics in x86 assembly: There’s no difference; they are two different mnemonics for the exact same instruction.

What does Je mean in assembly?

Conditional Jumps: Branching in Assembly 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 JA mean in assembly?

JA is used for jumping if the last “flag changing” instruction was on unsigned numbers. but on the other hand, JG is used for jumping if the last “flag changing” instruction was on signed numbers.

What is Subb in 8051?

The SUBB instruction subtracts the specified byte variable and the carry flag from the accumulator. The result is stored in the accumulator. This instruction sets the carry flag if a borrow is required for bit 7 of the result. If no borrow is required, the carry flag is cleared.

How does CMP work in 8086?

The CMP instruction compares two operands. 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 is the next instruction in x86-jnz?

The next instruction is a JNZ. My understanding was that the jump will take place if the Z flag is set. The Z flag IS set, but the jump doesn’t take place! Why? 43.52.4D. 43.52.4D. JNZ is short for “Jump if not zero (ZF = 0)”, and NOT “Jump if the ZF is set”.

What is the opcode for x86 coder64 edition?


Which is two byte opcode in JMP near?

It uses a JNZ to determine whether or not to process the record, which is a two byte opcode instruction (0F 85). But JMP Near is a single opcode instruction (E9). So I can’t just simply patch that word in memory and always skip past the code calling the imagespace modifier.

Which is the latest version of the x86 instruction set?

The updated instruction set is also grouped according to architecture ( i386, i486, i686) and more generally is referred to as x86 32 and x86 64 (also known as AMD64 ). 8086/8088 datasheet documents only base 10 version of the AAD instruction ( opcode 0xD5 0x0A), but any other base will work. Later Intel’s documentation has the generic form too.