CX PROGRAMMER INSTRUCTION LIST MANUAL

Check the zero flag if the string operation is SCAS or CMPS.Decrement CX or ECX by one no flags are modified.

If it is zero, exit the iteration, and move to the next instruction. If the address-size attribute is 16 bits, use CX for the count register if the address-size attribute is 32 bits, use ECX for the count register.The precise action for each iteration is as follows: To repeat a block of instructions, use the LOOP instruction or another looping construct. The REP prefixes apply only to one string instruction at a time. Synonymous forms of REPE and REPNE are REPZ and REPNZ, respectively. Each prefix cause the string instruction that follows to be repeated the number of times indicated in the count register or (for REPE and REPNE) until the indicated condition in the zero flag is no longer met. REP, REPE (repeat while equal), and REPNE (repeat while not equal) are prefix that are applied to string operation. IF (instruction is REPNZ or REPNE) AND (ZF=0) IF (instruction is REP/REPE/REPZ) AND (ZF=1) IF primitive operation is CMPB, CMPW, SCAB, or SCAW

Move (E)CX dwords from to ES:ДЇind nonmatching bytes in ES: and ДЇind nonmatching words in ES: and ДЇind nonmatching dwords in ES: and ДЇind non-EAX dword starting at ES:ДЇind matching bytes in ES: and ДЇind matching words in ES: and ДЇind matching dwords in ES: and Д®LSE (* AddressSize = 32 *) use ECX for CountReg REP/REPE/REPZ/REPNE/REPNZ - Repeat Following String Operation Opcode

CX PROGRAMMER INSTRUCTION LIST MANUAL

80386 Programmer's Reference Manual - Opcode REP AngoLinuxДЁ0386 Programmer's Reference Manual - Opcode REP

Cx programmer instruction list