How many bytes will the following instructions increment the EDI register?
CLD
MOVSW
CLD (Clear Direction Flag)
If CLD() executed before MOVSB/MOVSW/MOVSD instruction, the CPU decrements (1 byte for MOVSB/ 2byts for MOVSW/ 4 bytes for MOVSD) EDI registers after moving each string element.
If CLD()executed after MOVSB/MOVSW/MOVSD instruction, the CPU increments 1 byte for MOVSB/ 2byts for MOVSW/ 4 bytes for MOVSD) EDI registers after moving each string element.
MOVSW (Move string, words)
Takes word at [ESI] and stores it in [EDI] and then increment/ decrement ESI and EDI by 2 bytes.
How many bytes will the following instructions increment the EDI register? CLD MOVSW
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Thanks for the help 1. How many bytes are allocated in total for the variables (va vb, ve, vd, and ve)? 2. For cach of the instructions highlighted (boldface), derive the effective address of the memory variable (source) if any mmory variable is involved, and the contents of the register a or d (whichever one involved) right after the instruction is executed. Answer in hexadeci Asset all bytes in the variables va, vb and vc are inally zero. RAMStart EQU...
1. How many bytes are allocated in total for the variables (va, vb, vc, vd, and ve)? 2. For each of the instructions highlighted (boldface), derive the effective address of the memory variable (source) if any memory variable is involved, and the contents of the register a or d (whichever one involved) right after the instruction is executed. Answer in hexadecimal. Assume that all bytes in the variables va, vb and vc are initially zero. $0800 RAMStart EQU EQU ROMStart...
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