FLAGS Register (computing) - Flags

Flags

Intel x86 FLAGS register
Bit # Abbreviation Description Category
FLAGS
0 CF Carry flag Status
1 1 Reserved
2 PF Parity flag Status
3 0 Reserved
4 AF Adjust flag Status
5 0 Reserved
6 ZF Zero flag Status
7 SF Sign flag Status
8 TF Trap flag (single step) System
9 IF Interrupt enable flag Control
10 DF Direction flag Control
11 OF Overflow flag Status
12-13 IOPL I/O privilege level (286+ only), always 11 on 8086 and 186 System
14 NT Nested task flag (286+ only), always 1 on 8086 and 186 System
15 0 Reserved, always 1 on 8086 and 186, always 0 on later models
EFLAGS
16 RF Resume flag (386+ only) System
17 VM Virtual 8086 mode flag (386+ only) System
18 AC Alignment check (486SX+ only) System
19 VIF Virtual interrupt flag (Pentium+) System
20 VIP Virtual interrupt pending (Pentium+) System
21 ID Able to use CPUID instruction (Pentium+) System
22 0 Reserved
23 0 Reserved
24 0 Reserved
25 0 Reserved
26 0 Reserved
27 0 Reserved
28 0 Reserved
29 0 Reserved
30 0 Reserved
31 0 Reserved
RFLAGS
32-63 0 Reserved

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