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Instruction general - CLI—Clear Interrupt Flag

Clears the IF flag in the EFLAGS register. No other flags are affected. Clearing the IF flag causes the processor to ignore maskable external interrupts. The IF flag and the CLI and STI instruction have no affect on the generation of exceptions and NMI interrupts. In the IA-64 System Environment, external interrupts are enabled for IA-32 instructions if PSR.i and (~CFLG.if or EFLAG.if) is 1 and for IA-64 instructions if PSR.i is 1.