What does Movl mean in assembly?

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What does Movl mean in assembly?

movl \%cs:var, êx. Move the contents of memory location var in the code segment (register \%cs) into number register êx.

What does MOVQ mean in assembly language?

movq (assuming you’re talking about x86) is a move of a quadword (64-bit value). This particular instruction: movq (\%rsp), \%rsp. looks very much like code that will walk up through stack frames.

What does Movl do to upper 4 bytes?

movl will write into all 4 bytes. In your example, it’ll zero out the upper 3 bytes, and put 1 in the lowest byte.

What is Lea 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.

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What does Movl instruction do?

The mov instruction (you have to learn these specifics for any instruction) does not care about the value stored in the location indicated by the target operand, but it will store a copy of the value of the source operand at the location indicated by the second operand, overwriting the previous value.

What is difference between MOV and Movl?

movq and movl are variations of the mov command (moving data to a memory location or a register). movq moves 8 bytes starting at the current specified memory address whereas movl moves 4 bytes starting at the current specificed memory address.

What does MOVQ instruction do?

The movq instruction moves the 1st argument (passed in \%rdi) to its place on the stack. The argument occupies the first stack position (stack entries are 8 bytes) after the base pointer (\%rbp).

What is Pushq Assembly?

A push instruction pushes a value onto the stack. This both modifies the stack pointer (making it smaller) and modifies the stack segment (by moving data there). For instance, the instruction pushq X means: subq $8, \%rsp movq X, (\%rsp) And popq X undoes the effect of pushq X .

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Which of the following instruction is same as JNE?

Conditional Jump

Instruction Description Flags tested
JE/JZ Jump Equal or Jump Zero ZF
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

What are the four different types of instructions Assembly?

Machne language instructions are of four types: Arithmetic, Logical, Data transfer, and Branches (also called flow control), as follows:

  • Arithmetic: add (addition), sub (subtraction), mult (multiplication), div (division)
  • Logical: and , or , srl (shift right logical), ssl (shift left logical)

What is movq Assembly?

Furthermore, what is MOVQ Assembly? movq (assuming you’re talking about x86) is a move of a quadword (64-bit value). This particular instruction: movq (\%rsp), \%rsp. looks very much like code that will walk up through stack frames. Also asked, how does Lea work Assembly?

What is the difference between movmovq and MOVL?

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movq moves a quadword (64-bits) from source to destination. movl moves a long (32-bits) from source to destination.

What is Assembly assembly – movs instruction?

Assembly – MOVS Instruction – The MOVS instruction is used to copy a data item (byte, word or doubleword) from the source string to the destination string. The source string is pointed by DS Home

What is the size of the MOVL instruction?

The MOVL instruction was generated because you put two int (i and j variables), MOVL will perform a MOV of 32 bits, and integer’ size is 32 bits. a non exhaustive list of all MOV* exist (like MOVD for doubleword or MOVQ for quadword) to allow to optimize your code and use the better expression to gain most time as possible.

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