A condition code (cc) is added to each statement to indicate the condition for which the test is being performed. For example, the YES instruction (ignore if above) and the JNBE instruction (ignore if not less than or equal to) are alternating mnemonic characters for opcode 77H.
Arches and branches in meetingHelpful guide for
The four flags that CMP instructions Z, O, C, and S can specify are called zero, overflow, carry, and sign flags, respectively. The zero flag is set when the result of the subtraction is zero. Of course, this only happens if the operands are the same.
A rung is an instruction in a computer program that can cause a computer to start executing a different order of instructions, thereby deviating from the standard behavior of executing instructions in order.
The MOV instruction is the most important instruction of the 8086 as it moves data from one location to another. It also has the most parameters so that the assembler programmer can use MOV efficiently, the rest of the commands are easier to understand. MOV copies the data from the source to the destination.
Depending on the condition, this is done using a series of j jump commands. Conditional jump.
JMP (x86 command) In the x86 editing language, the JMP command makes an unconditional jump. This instruction transfers the flow of ■■■■■■■■■ by changing the instruction pointer register.
Unconditional means that the program flow reaches the point where it always continues on the target. An if and a switch are a conditional leap. At the end of the sentence, an if is followed by an unconditional jump after the second sentence.
A jump instruction like jmp simply switches the processor to ■■■■■■■ a different section of code. It is the equivalent of goto in editing, but unlike goto, jumps in editing are not considered awkward.
Notice how a function statement looks like a jump symbol in assembler. The only real difference is that you can return from an extension that has the right to return to the person who called you. Define the features in the assembly.
eax is a 32-bit generic register with two general uses: to store the return value of a function and as a special register for certain calculations.
The instruction pointer register (% rip) points to the next instruction to ■■■■■■■, it is not directly accessible to the programmer, but is often used as a basis for addressing position-dependent code.
The LEA statement provides access to memory.