What is instruction in assembly language?
What is instruction in assembly language?
What is instruction in assembly language?
An instruction is a statement that is executed at runtime. An x86 instruction statement can consist of four parts: Label (optional) Instruction (required) Operands (instruction specific)
What is JBE in NASM?
JBE rel8. Jump short if below or equal (CF=1 or ZF=1)
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 |
How does CMP instructions work?
The CMP instruction subtracts the value of Operand2 from the value in Rn . This is the same as a SUBS instruction, except that the result is discarded. The CMN instruction adds the value of Operand2 to the value in Rn . This is the same as an ADDS instruction, except that the result is discarded.
How many instructions are there in assembly language?
A typical assembly language consists of 3 types of instruction statements that are used to define program operations: Opcode mnemonics. Data definitions. Assembly directives.
Which flags is affected by JBE?
Conditional Jump
| Instruction | Description | Flags tested |
|---|---|---|
| JNE/JNZ | Jump not Equal or Jump Not Zero | ZF |
| JG/JNLE | Jump Greater or Jump Not Less/Equal | OF, SF, ZF |
| JGE/JNL | Jump Greater/Equal or Jump Not Less | OF, SF |
| JL/JNGE | Jump Less or Jump Not Greater/Equal | OF, SF |
What is MOV instruction in assembly language?
The mov instruction copies the data item referred to by its second operand (i.e. register contents, memory contents, or a constant value) into the location referred to by its first operand (i.e. a register or memory).
How many instructions are in x86_64?
states that the current x86-64 design “contains 981 unique mnemonics and a total of 3,684 instruction variants” [2]. However they do not specify which features are included in their count.
How many instructions does arm64 have?
3 Instruction sets
3 Instruction sets in the Armv8-A The ’64’ in the name refers to the use of this instruction by the AArch64 Execution state. It does not refer to the size of the instructions in memory. The A32 and T32 instruction sets are also referred to as ‘ARM’ and ‘Thumb’, respectively.