Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1673

STC—Set Carry Flag
Opcode
F9
Description
Sets the CF flag in the EFLAGS register.
Operation
CF  1;
Flags Affected
The CF flag is set. The OF, ZF, SF, AF, and PF flags are unaffected.
Exceptions (All Operating Modes)
None.
Volume 4: Base IA-32 Instruction Reference
Instruction Description
STC Set CF flag
4:371