WebCMPSB, CMPSW and CMPSD are synonyms for the byte, word, and doubleword CMPS instructions, respectively. CMPS can be preceded by the REPE or REPNE prefix for block comparison of CX or ECX bytes, words, or doublewords. Refer to the description of the REP instruction for more information on this operation. Flags Affected Web• Once a flag is set, it remains in that state until another instruction that affects the flags is executed • Not all instructions affect all status flags ∗add and sub affect all six flags ∗inc and dec affect all but the carry flag ∗mov, push, and pop do not affect any flags
AAM — ASCII Adjust AX After Multiply
WebFlags Affected OF, SF, ZF, AR, PF, CF are undefined. Protected Mode Exceptions ... Virtual 8086 Mode Exceptions Same exceptions as in Real Address Mode; #PF(fault-code) for a page fault up: Chapter 17 -- 80386 Instruction Set prev: DEC Decrement by 1 next: ... WebCMP is typically used in conjunction with conditional jumps and the SETcc instruction. (Refer to Appendix D for the list of signed and unsigned flag tests provided.) If an operand greater than one byte is compared to an immediate byte, the byte value is first sign-extended. Flags Affected OF, SF, ZF, AF, PF, and CF as described in Appendix C sytec carbofol
Characteristics of the CMP instructions. - 8086
WebThe AAM instruction is only useful when it follows an MUL instruction that multiplies (binary multiplication) two unpacked BCD values and stores a word result in the AX register. The AAM instruction then adjusts the contents of the AX register to contain the correct 2-digit unpacked (base 10) BCD result. WebCMP AX, BX Assume that flags ZF, SF, CF, AF, OF, and PF are all initially reset. Solution: The first instruction loads AX with 1234 H. No status flags are affected by the … WebMar 10, 2024 · The CMP instruction does internally a SUB and sets the flags accordingly. So all flags that are set by a SUB are also set by CMP. … sytech alcester