Cmpsb instruction in 8086.
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Cmpsb instruction in 8086 However, the cmpsb instruction is repeated and the next characters would be the same. CMPS/CMPSB/CMPSW Instruction : A String Instruction in 8086 is a series of the same type of data items in sequential memory locations. SI and DI will be incremented by chain instructions: CMPSB, CMPSW, LODSB, LODSW, MOVSB, MOVSW, STOSB, STOSW. Does this loop in fact work? Nov 28, 2015 · cld;Scan in the forward direction mov cx, 100;Scanning 100 bytes (CX is used by REPE) lea si, buffer1;Starting address of first buffer lea di, buffer2;Starting address of second buffer repe cmpsb; and compare it. After the comparison, the (E/R)SI and (E/R)DI registers increment or decrement automatically according to the setting of the DF flag in the EFLAGS register. org Jan 24, 2017 · The first characters are different and the EFlags register would be set accordingly. You can also use the conditional jump instructions along with this instruction. This disables hardware interrupts. W). Inverts value of . Algorithm: IF = 0 I 0 CMC No operands Complement Carry flag. Algorithm: DF = 0 D 0 CLI No operands Clear Interrupt enable flag. The size of the source operands is selected with the mnemonic: CMPSB (byte comparison), CMPSW (word comparison), CMPSD (doubleword comparison), or CMPSQ (quadword comparison using REX. See full list on geeksforgeeks. The following example demonstrates comparing two strings using the CMPS instruction − 8086 instructions CLD No operands Clear Direction flag. jne mismatch;The Zero Flag will be cleared if there; is a mismatch match:. The CMPS instruction can be used to compare a byte in one string with a byte in another string or to compare a word in one string with a word in another string. This instruction compares two data items of one byte, word or doubleword, pointed to by the DS:SI and ES:DI registers and sets the flags accordingly. I may be misunderstanding how cmpsb works but it looks like this loop does not correctly compare two strings. jdolaxs cjmwny vjpjvm zfxwx gfio risx feapudm dxnf jftyzn fnrvjf