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POPFD

Pops the top word from the stack and loads it into the EFLAGS register. The stack pointer (RSP) is incremented by 2 bytes after the operation.

The following table covers what the source and destinations can be:

DO NOT support LOCK

This instruction is only available in 32-bit mode or in 64-bit mode when operating in compatibility mode. In 64-bit mode, this instruction is not supported; POPRQ must be used to manipulate the RFLAGS register.

The POPFD instruction does not affect the IF (Interrupt Enable Flag), the NT (Nested Task) flag, or the IOPL (I/O Privilege Level) field. Attempting to modify these protected flags via POPFD will result in those specific bits remaining unchanged in the EFLAGS register.