Скачать или смотреть Control Transfer and Conditional Action Instructions

Control transfer and conditional action instructions in assembly language provide the means to alter the flow of program execution based on certain conditions or to explicitly transfer control to different parts of the code. Here are some common instructions related to control transfer and conditional actions:

Unconditional Jump Instructions:
Jump (JMP):
Unconditionally transfers control to a specified address.
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JMP target_label ; Jump to the specified label or address
Conditional Jump Instructions:
Jump If Equal (JE or JZ):

Jumps to the specified address if the Zero Flag is set (indicating equality).
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JE target_label ; Jump if the Zero Flag is set (equal)
Jump If Not Equal (JNE or JNZ):

Jumps to the specified address if the Zero Flag is not set (indicating inequality).
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JNE target_label ; Jump if the Zero Flag is not set (not equal)
Jump If Greater (JG):

Jumps to the specified address if the Sign Flag and Zero Flag are clear (indicating a greater signed value).
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JG target_label ; Jump if the Sign Flag and Zero Flag are clear (greater)
Jump If Less (JL):

Jumps to the specified address if the Sign Flag is set (indicating a negative value).
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JL target_label ; Jump if the Sign Flag is set (less)
Jump If Zero (JZ):

Jumps to the specified address if the Zero Flag is set.
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JZ target_label ; Jump if the Zero Flag is set
Conditional Set Instructions:
Set If Equal (SETE):

Sets the destination operand to 1 if the Zero Flag is set (indicating equality).
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SETE AL ; Set AL to 1 if the Zero Flag is set
Set If Not Equal (SETNE):

Sets the destination operand to 1 if the Zero Flag is not set (indicating inequality).
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SETNE BL ; Set BL to 1 if the Zero Flag is not set
Loop Instructions:
Loop (LOOP):
Decrements the CX register and jumps to the specified address until CX becomes zero.
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LOOP target_label ; Decrement CX and jump if CX is not zero
Call and Return Instructions:
Call (CALL):

Saves the return address on the stack and transfers control to the specified address.
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CALL subroutine ; Save return address and jump to the subroutine
Return (RET):

Retrieves the return address from the stack and transfers control back to the calling routine.
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RET ; Return to the calling routine
These instructions are fundamental for implementing control structures and decision-making in assembly language programs. They allow programmers to create loops, conditionally execute code, and transfer control between different parts of the program based on specific conditions. Understanding and using these instructions effectively is crucial for writing flexible and responsive assembly language code.