STC

Set Carry Flag

stableVMJITAOTinstruction

Encodings

Opcode	Instruction	Op/En	64-bit	Compat/Legacy	Description
`F9`	`STC`	ZO	Valid	Valid	Set CF flag.

Measured cost

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Flags named

CF Carry
PF Parity
AF Auxiliary carry
ZF Zero
SF Sign
OF Overflow

Description

Sets the CF flag in the EFLAGS register. Operation is the same in all modes.

Operation

CF := 1;

Flags affected

The CF flag is set. The OF, ZF, SF, AF, and PF flags are unaffected.

Exceptions

Real address mode

#UD If the LOCK prefix is used.

Protected mode

#UD If the LOCK prefix is used.

Virtual-8086 mode

#UD If the LOCK prefix is used.

Compatibility mode

#UD If the LOCK prefix is used.

64-bit mode

#UD If the LOCK prefix is used.

Sources