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MOVS m32, m32. Move doubleword at address DS:(E)SI to address ES:(E)DI. A4. MOVSB. Move byte at address DS:(E)SI to address ES:(E)DI. A5. MOVSW The MOVS, MOVSB, MOVSW, and MOVSD instructions can be preceded by the REP prefix (see "REP/REPE/REPZ/REPNE /REPNZ--Repeat String Operation Prefix"
The MOV instruction is the most important command in the 8086 because it moves data from one location to another. .. rep movsb. CLD clears the direction flag. This tells the 8086 that it must increment the SI and DI register after each iteration. If the direction flag is set instead of being cleared (using STD) then the 8086 will
Microprocessor 8086 Instruction Sets - Learn Microprocessor in simple and easy steps starting from basic to advanced concepts with examples including Overview, Classification, 8085 Architecture, 8085 Pin Configuration, 8085 Addressing Modes and Interrupts, 8085 Instruction Sets, 8086 Overview, 8086 Functional Units,
When executed by itself, the MOVS instruction ignores the value in the ECX register. The repeat prefixes tell the 80x86 to do a multi-byte string operation. The syntax for the repeat prefix is: For MOVS: rep.movsb(); rep.movsw(); rep.movsd(); For CMPS: repe.cmpsb(); // Note: repz is a synonym for repe. repe.cmpsw();
These cause the instruction to be repeated the number of times in the count register, CX; for REPE and REPNE, the Zero flag is tested at the end of each operation and the loop is stopped if the condition (Equal or Not Equal to zero) fails. The MOVSB and MOVSW instructions have the following forms: MOVSB REP MOVSB
06 REP MOVSB EXIT: Next instrn. by 2 SI and DI CMPSB is equivalent to (assuming D = 0) CMPSW is equivalent to (assuming D = 0) MOV AL. 2 POPF POPF POPF used to ensure that flags are not again affected because of INC instructions Normally CMPSB or CMPSW instructions are used to check if two given strings are
BYTE WISE STRING INSTRUCTION STOSB LODSB MOVSB SCASB CMPSB. WORD WISE STRING INSTRUCTION STOSW LODSW MOVSW SCASW CMPSW. Produced zero result. REP prefix is used with CX as a counter Types REP dec CX by 1 and repeat that string instruction if CX is non zero. but to handle large
Assembly Strings - Learning assembly programming language in simple and easy steps using this beginner's tutorial containing basic to advanced knowledge starting from Environment Setup, Status Register, Arithmetic Instructions, Conditional Execution, Loop Instructions, Logical Instructions, String Processing, Recursion
The x86 instruction set refers to the set of instructions that x86-compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes
The address of the destination operand is read from the ES:EDI or the ES:DI registers (again depending on the address-size attribute of the instruction). The MOVS, MOVSB, MOVSW, and MOVSD instructions can be preceded by the REP prefix (see "REP/REPE/REPZ/REPNE /REPNZ-Repeat String Operation Prefix" in
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