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21 Dec 2015 Instruction Set of 8086 The 8086 instructions are categorized into the following main types. i PUSH: Push to Stack This instruction pushes the contents of the specified . [reg] [mem] [ES] [mem + 2] Eg. LES reg, mem Flag transfer instructions: LAHF: Load (copy to) AH with the low byte the flag register.
Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Flag Instructions > Load Flags into AH Register (lahf). IA-32 Assembly Language Reference Manual. Previous: I/O Instructions · Next: Store AH into Flags (sahf)
Operation. AH := SF:ZF:xx:AF:xx:PF:xx:CF;. Description. LAHF transfers the low byte of the flags word to AH. The bits, from MSB to LSB, are sign, zero, indeterminate, auxiliary, carry, indeterminate, parity, indeterminate, and carry. Flags Affected. None. Protected Mode Exceptions. None. Real Address Mode Exceptions. None
LAHF No operands Load AH from 8 low bits of Flags register. Algorithm: AH = flags register. AH bit: 7 6 5 4 3 2 1 0 [SF] [ZF] [0] [AF] [0] [PF] [1] [CF] bits 1, 3, 5 are reserved. C, Z, S, O, P, A. unchanged.
LAHF Instruction in 8086: Load lower byte of flag register in AH. This instruction copies the contents of lower byte of 8086 flag register to AH register. STOSB instruction in 8086: The STOS instruction copies a byte from AL or a word from AX to a memory location in the extra segment. DI is used to hold the
13 Mar 2012 VMware ESXi 5.0 only installs and runs on servers with 64-bit x86 CPUs. It also only supports LAHF and SAHF CPU instructions. These are known 64-bit processors: All AMD Opteron processors; All Intel Xeon 3000/3200, 3100/3300, 5100/5300, 5200/5400, 5500/5600, 7100/7300, 7200/7400, and 7500
LAHF Load Register AH from Flags Flags: not altered Logic: AH bits Flag-reg bits 7 6 4 2 0 S Z A P C LAHF copies the five 8080/8085 flags (Sign, Zero, Auxiliary Carry, Parity, and Carry) into bits 7, 6, Notes: This instruction is primarily used to provide upward compatibility between the 8080/8085 family and the 8086 family.
Flag Control Instructions 8086. The first two instructions LAHF and SAHF can be used either to read the flags or to change them respectively notice that the data transfer that takes place is always between the AH register and flag register. For instance, we may want to start an operation with certain flags set or reset. Assume
LAHF instruction loads lower byte of the EFLAGS register into AH register. The lowest 8 bits of the flags are transferred: Sign. Zero. Auxiliary Carry. Parity. Carry. Instruction format: lahf. SAHF restores the value of lower byte flags. Format: sahf
See Description section. Instruction Operand Encoding Op/En Operand 1 Operand 2 Operand 3 Operand 4 ZO NA NA NA NA Description This instruction executes as described above in compatibility mode and legacy mode. It is valid in 64-bit mode only if CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1. Operation IF 64-Bit
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