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Movsw instruction




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22 Apr 2016 movsw , movsb , movsd , movsq are instructions used to copy data from the source location DS:(ER)SI to destination location ES:(ER)DI . They are useful Opcode. Instruction. Description. A4. MOVS m8, m8. Move byte at address DS:(E)SI to address ES:(E)DI. A5. MOVS m16, m16. Move word at address DS:(E)SI to MOVS/MOVSB/MOVSW/MOVSD -- Move Data from String to String. Opcode Instruction Clocks Description A4 MOVS m8,m8 7 Move byte [(E)SI] to ES:[(E)DI] A5 MOVS/MOVSB/MOVSW/MOVSD -- Move Data from String to String Opcode Instruction Clocks Description A4 MOVS m8,m8 7 Move byte [(E)SI] to ES:[(E)DI] A5 When the first form, MOVS des_string, src_string, is used the assembler will replace it by MOVSB, MOVSW, or MOVSD depending on the size of the operands This instruction copies a byte or a word from a location in the data segment [DS:SI] to a location in the extra segment [ES:DI]. The offset in the data segment for 3 Nov 2016 Generates a Move String ( rep movsw ) instruction. Syntax. void __movsw( unsigned short* Dest, unsigned short* Source, size_t Count ); A5, MOVSW, Move word at address DS:(E)SI to address ES:(E)DI The MOVS, MOVSB, MOVSW, and MOVSD instructions can be preceded by the REP prefix To make DF = 0, use the cld instruction To make DF = 1, use the std instruction MOVSW. The word form of movsb is movsw. movsw ;move string word.The string instructions facilitate operations on sequences of bytes or words. None of The MOVSB and MOVSW instructions have the following forms: MOVSB

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