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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
13 Mar 2012 The direction flag control instructions are specifically included to set or clear the direction flag, DF, which controls the left-to-right or right-to-left direction of string processing. If DF="0", the processor automatically increments the string index registers, ESI and EDI, after each execution of a string primitive.
LAHF - Load Register AH From Flags Usage: LAHF Modifies flags: None Copies bits 0-7 of the flags register into AH. This includes flags AF, CF, PF, SF and ZF other bits are undefined. AH := SF ZF xx AF xx PF xx CF Clocks Size Operands 808x 286 386 486 Bytes none 4 2 2 3 1
INC and DEC Example; CLC, STC, CMC - Direct Carry Flag Manipulation; Overflow Flag Examples; The LAHF and SAHF Instructions; The NEG Instruction; The For example, if decrementing a register produces zero value, the zero flag ZF is set by the processor. mov al, 6 sub al, 9 ; AL = -3, SF and CF flags are set to 1.
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 If the direction flag is set, DI will be automatically decremented by one for a byte string or decremented by two for a word string. STOS does not
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 Mode THEN IF CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1; THEN AH < RFLAGS(SF:ZF:0:AF:0:PF:1:CF); ELSE #UD;
23 Sep 2012 Many virtualization admins know what NX/XD is but LAHF & SAHF CPU instructions are a processor function that you have probably never heard of. the server BIOS, support for LAHF/SAHF is typically tied into the Virtualization Technology (VT) option in a server BIOS which is often referred to Intel VT or
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)
up: Chapter 17 -- 80386 Instruction Set prev: JMP Jump next: LAR Load Access Rights Byte. LAHF -- Load Flags into AH Register. Opcode Instruction Clocks Description 9F LAHF 2 Load: AH := flags SF ZF xx AF xx PF xx CF. Operation. AH := SF:ZF:xx:AF:xx:PF:xx:CF;. Description. LAHF transfers the low byte of the flags
lahf just loads the cpu flags into the upper byte of the ax regishter ( ah ). Bit 0 of the flags (and ah after a lahf instruction) is the carry flag. So, if the msb of bh was 1 then after a left shift the carry would be set. Basically this is just popping off bi](http://cdn08.dayviews.com/501/_u4/_u1/_u3/_u1/_u0/_u5/u4131059/50181_1521459289/Lahf_instruction_setting_http_ciu_cloudz_pw_download_file_lahf_instruction_setting_Download_Lahf.jpg)
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Lahf instruction setting: >> http://ciu.cloudz.pw/download?file=lahf+instruction+setting << (Download)
Lahf instruction setting: >> http://ciu.cloudz.pw/read?file=lahf+instruction+setting << (Read Online)
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
13 Mar 2012 The direction flag control instructions are specifically included to set or clear the direction flag, DF, which controls the left-to-right or right-to-left direction of string processing. If DF="0", the processor automatically increments the string index registers, ESI and EDI, after each execution of a string primitive.
LAHF - Load Register AH From Flags Usage: LAHF Modifies flags: None Copies bits 0-7 of the flags register into AH. This includes flags AF, CF, PF, SF and ZF other bits are undefined. AH := SF ZF xx AF xx PF xx CF Clocks Size Operands 808x 286 386 486 Bytes none 4 2 2 3 1
INC and DEC Example; CLC, STC, CMC - Direct Carry Flag Manipulation; Overflow Flag Examples; The LAHF and SAHF Instructions; The NEG Instruction; The For example, if decrementing a register produces zero value, the zero flag ZF is set by the processor. mov al, 6 sub al, 9 ; AL = -3, SF and CF flags are set to 1.
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 If the direction flag is set, DI will be automatically decremented by one for a byte string or decremented by two for a word string. STOS does not
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 Mode THEN IF CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1; THEN AH < RFLAGS(SF:ZF:0:AF:0:PF:1:CF); ELSE #UD;
23 Sep 2012 Many virtualization admins know what NX/XD is but LAHF & SAHF CPU instructions are a processor function that you have probably never heard of. the server BIOS, support for LAHF/SAHF is typically tied into the Virtualization Technology (VT) option in a server BIOS which is often referred to Intel VT or
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)
up: Chapter 17 -- 80386 Instruction Set prev: JMP Jump next: LAR Load Access Rights Byte. LAHF -- Load Flags into AH Register. Opcode Instruction Clocks Description 9F LAHF 2 Load: AH := flags SF ZF xx AF xx PF xx CF. Operation. AH := SF:ZF:xx:AF:xx:PF:xx:CF;. Description. LAHF transfers the low byte of the flags
lahf just loads the cpu flags into the upper byte of the ax regishter ( ah ). Bit 0 of the flags (and ah after a lahf instruction) is the carry flag. So, if the msb of bh was 1 then after a left shift the carry would be set. Basically this is just popping off bits from msb to lsb from bh .
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