Intel Pentium CPU Instruction Set Reference
SAHF instruction - Store AH into Flags
| Code |
Mnemonic |
Description |
| 9E |
SAHF |
Loads SF, ZF, AF, PF, and CF from AH into EFLAGS register |
Description
Loads the SF, ZF, AF, PF, and CF flags of the EFLAGS register with values from the corresponding bits in the AH register (bits 7, 6, 4, 2, and 0, respectively). Bits 1, 3, and 5 of register AH are ignored; the corresponding reserved bits (1, 3, and 5) in the EFLAGS register remain as shown in the "Operation" section below.
| Operands |
Bytes |
Clocks |
|
1 |
2 |
NP |
Flags
| ID |
unaffected |
DF |
unaffected |
| VIP |
unaffected |
IF |
unaffected |
| VIF |
unaffected |
TF |
unaffected |
| AC |
unaffected |
SF |
loaded with values from the AH register |
| VM |
unaffected |
ZF |
loaded with values from the AH register |
| RF |
unaffected |
AF |
loaded with values from the AH register |
| NT |
unaffected |
PF |
loaded with values from the AH register |
| IOPL |
unaffected |
CF |
loaded with values from the AH register |
| OF |
unaffected |
