Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 4 REV 2.3 Manual page 258

LAHF—Load Status Flags into AH Register
Opcode
9F
Description
Moves the low byte of the EFLAGS register (which includes status flags SF, ZF, AF, PF,
and CF) to the AH register. Reserved bits 1, 3, and 5 of the EFLAGS register are set in
the AH register as shown in the "Operation" below.
Operation
AH  EFLAGS(SF:ZF:0:AF:0:PF:1:CF);
Flags Affected
None (that is, the state of the flags in the EFLAGS register are not affected).
Additional Itanium System Environment Exceptions
Itanium Reg Faults NaT Register Consumption Abort.
Exceptions (All Operating Modes)
None.
Volume 4: Base IA-32 Instruction Reference
Instruction Description
LAHF Load: AH = EFLAGS(SF:ZF:0:AF:0:PF:1:CF)
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