DAS − Used to adjust decimal after subtraction. - Whenever a compare operation is performed the result of such an operation reflects in one of the six status flags CF, AF, OF, PF, SF and ZF. Used to avoid two processors from updating the same data location. Operation LeftSRC - SignExtend(RightSRC); (* CMP does not store a result; its purpose is to set the flags *) Description CMP subtracts the second operand from the first but, unlike the SUB instruction, does not store the result; only the flags are changed. CMP: - (compare register or memory with accumulator) The contents of the operand register or memory are M compared with the contents of the accumulator. The condition codes used by the Jcc, CMOVcc, and SETcc instructions are based on the … Subtracts source operand from destination operand and updates flags only. Compare and Jump instructions-8086 assembly Compare instruction-CMP CMP works like sub instruction with the only difference that it doesn’t change operands. cmp eax, ebx jne .eax_is_not_equal_to_ebx cmp ecx, edx ja .ecx_is_above_than_edx This way, the program becomes more readable and you will never be confused. Example: CMP AX, BX ; Performs (AX-BX) and updates flags. The CMP Instruction. Sayef Reyadh - Programming Made Simple 6,433 views There are 9 different opcodes for the TEST instruction depending on the type and size of the operands.It can compare 8-bit, 16-bit, 32-bit or 64-bit values. ... CMOVcc, and SETcc instructions are based on the results of a CMP instruction. Compare the numerical value of the destination with the source and set flags appropriately. If we take the sub (which is basically what a cmp does) instruction as an example, we have: . The criterion required for a jl is that SF ≠ OF.It loads EIP with the specified address, if the criterion is met. 8086 Assembler compare two operands without CMP. I understand that a compare subtracts two operands but I was wondering if anyone can provide an example when that is the case. However, when using this manual, be careful to only use instructions compatible with the 8086. I've been reading around and with the 8086 Instruction Set, it says that a CMP (compare) can set the Carry Flag. x86 Instruction Set Reference CMP Compare Two Operands. ... (subtract without borrow) instruction with one important difference - it does not store the difference back into the destination operand. when 8086 … Doubt regarding ADD instruction of the 8086 microprocessor. It impacts the Zero Flag (ZF) as well as the Carry Flag (CF) as follows: The OF and CF flags are set to 0, while AF flag is undefined. The cmp instruction is used to perform comparison. So either SF or OF can be set, but not both in order to satisfy this criterion. The 286 always asserts lock during an XCHG with memory operands. Also, we will learn how the control of the instruction execution is affected by these instructions? Instruction to perform multiplication. Detailed Instruction List. AAS − Used to adjust ASCII codes after subtraction. Opcode Mnemonic ... subtracting the second operand from the first operand and then setting the status flags in the same manner as the SUB instruction. You cannot test other flags after cmpxchg as you could do in just CMP instruction. Microprocessor - 8086 Instruction Sets - The 8086 microprocessor supports 8 types of instructions ... CMP − Used to compare 2 provided byte/word.
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